libvips-doc 7.38.5-2 / usr / share / gtk-doc / html / libvips / libvips-colour.html

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                  <a href="#libvips-colour.description" class="shortcut">Description</a>
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<h2><span class="refentrytitle"><a name="libvips-colour.top_of_page"></a>colour</span></h2>
<p>colour — colour operators</p>
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<div class="refsect1">
<a name="libvips-colour.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
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<div class="refsynopsisdiv">
<a name="libvips-colour.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;vips/vips.h&gt;

#define             <a class="link" href="libvips-colour.html#VIPS-D93-X0:CAPS" title="VIPS_D93_X0">VIPS_D93_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D93-Y0:CAPS" title="VIPS_D93_Y0">VIPS_D93_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D93-Z0:CAPS" title="VIPS_D93_Z0">VIPS_D93_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D75-X0:CAPS" title="VIPS_D75_X0">VIPS_D75_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D75-Y0:CAPS" title="VIPS_D75_Y0">VIPS_D75_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D75-Z0:CAPS" title="VIPS_D75_Z0">VIPS_D75_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D65-X0:CAPS" title="VIPS_D65_X0">VIPS_D65_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D65-Y0:CAPS" title="VIPS_D65_Y0">VIPS_D65_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D65-Z0:CAPS" title="VIPS_D65_Z0">VIPS_D65_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D55-X0:CAPS" title="VIPS_D55_X0">VIPS_D55_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D55-Y0:CAPS" title="VIPS_D55_Y0">VIPS_D55_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D55-Z0:CAPS" title="VIPS_D55_Z0">VIPS_D55_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D50-X0:CAPS" title="VIPS_D50_X0">VIPS_D50_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D50-Y0:CAPS" title="VIPS_D50_Y0">VIPS_D50_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D50-Z0:CAPS" title="VIPS_D50_Z0">VIPS_D50_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-A-X0:CAPS" title="VIPS_A_X0">VIPS_A_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-A-Y0:CAPS" title="VIPS_A_Y0">VIPS_A_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-A-Z0:CAPS" title="VIPS_A_Z0">VIPS_A_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-B-X0:CAPS" title="VIPS_B_X0">VIPS_B_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-B-Y0:CAPS" title="VIPS_B_Y0">VIPS_B_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-B-Z0:CAPS" title="VIPS_B_Z0">VIPS_B_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-C-X0:CAPS" title="VIPS_C_X0">VIPS_C_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-C-Y0:CAPS" title="VIPS_C_Y0">VIPS_C_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-C-Z0:CAPS" title="VIPS_C_Z0">VIPS_C_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-E-X0:CAPS" title="VIPS_E_X0">VIPS_E_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-E-Y0:CAPS" title="VIPS_E_Y0">VIPS_E_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-E-Z0:CAPS" title="VIPS_E_Z0">VIPS_E_Z0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D3250-X0:CAPS" title="VIPS_D3250_X0">VIPS_D3250_X0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D3250-Y0:CAPS" title="VIPS_D3250_Y0">VIPS_D3250_Y0</a>
#define             <a class="link" href="libvips-colour.html#VIPS-D3250-Z0:CAPS" title="VIPS_D3250_Z0">VIPS_D3250_Z0</a>
enum                <a class="link" href="libvips-colour.html#VipsIntent" title="enum VipsIntent">VipsIntent</a>;
enum                <a class="link" href="libvips-colour.html#VipsPCS" title="enum VipsPCS">VipsPCS</a>;
<span class="returnvalue">gboolean</span>            <a class="link" href="libvips-colour.html#vips-colourspace-issupported" title="vips_colourspace_issupported ()">vips_colourspace_issupported</a>        (<em class="parameter"><code>const <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-colourspace" title="vips_colourspace ()">vips_colourspace</a>                    (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html#VipsInterpretation" title="enum VipsInterpretation"><span class="type">VipsInterpretation</span></a> space</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-LabQ2sRGB" title="vips_LabQ2sRGB ()">vips_LabQ2sRGB</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()">vips_rad2float</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-float2rad" title="vips_float2rad ()">vips_float2rad</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-LabS2LabQ" title="vips_LabS2LabQ ()">vips_LabS2LabQ</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-LabQ2LabS" title="vips_LabQ2LabS ()">vips_LabQ2LabS</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-LabQ2Lab" title="vips_LabQ2Lab ()">vips_LabQ2Lab</a>                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-Lab2LabQ" title="vips_Lab2LabQ ()">vips_Lab2LabQ</a>                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-LCh2Lab" title="vips_LCh2Lab ()">vips_LCh2Lab</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-Lab2LCh" title="vips_Lab2LCh ()">vips_Lab2LCh</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-Yxy2Lab" title="vips_Yxy2Lab ()">vips_Yxy2Lab</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-CMC2XYZ" title="vips_CMC2XYZ ()">vips_CMC2XYZ</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-Lab2XYZ" title="vips_Lab2XYZ ()">vips_Lab2XYZ</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-XYZ2Lab" title="vips_XYZ2Lab ()">vips_XYZ2Lab</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-XYZ2scRGB" title="vips_XYZ2scRGB ()">vips_XYZ2scRGB</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-scRGB2sRGB" title="vips_scRGB2sRGB ()">vips_scRGB2sRGB</a>                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-sRGB2scRGB" title="vips_sRGB2scRGB ()">vips_sRGB2scRGB</a>                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-scRGB2XYZ" title="vips_scRGB2XYZ ()">vips_scRGB2XYZ</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-LCh2CMC" title="vips_LCh2CMC ()">vips_LCh2CMC</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-CMC2LCh" title="vips_CMC2LCh ()">vips_CMC2LCh</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-XYZ2Yxy" title="vips_XYZ2Yxy ()">vips_XYZ2Yxy</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-Yxy2XYZ" title="vips_Yxy2XYZ ()">vips_Yxy2XYZ</a>                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-LabS2Lab" title="vips_LabS2Lab ()">vips_LabS2Lab</a>                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-Lab2LabS" title="vips_Lab2LabS ()">vips_Lab2LabS</a>                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-icc-present" title="vips_icc_present ()">vips_icc_present</a>                    (<em class="parameter"><code><span class="type">void</span></code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-icc-transform" title="vips_icc_transform ()">vips_icc_transform</a>                  (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *output_profile</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-icc-import" title="vips_icc_import ()">vips_icc_import</a>                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-icc-export" title="vips_icc_export ()">vips_icc_export</a>                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-icc-ac2rc" title="vips_icc_ac2rc ()">vips_icc_ac2rc</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *profile_filename</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-dE76" title="vips_dE76 ()">vips_dE76</a>                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *left</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *right</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-dE00" title="vips_dE00 ()">vips_dE00</a>                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *left</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *right</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-dECMC" title="vips_dECMC ()">vips_dECMC</a>                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *left</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *right</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-colour.html#vips-col-Lab2XYZ" title="vips_col_Lab2XYZ ()">vips_col_Lab2XYZ</a>                    (<em class="parameter"><code><span class="type">float</span> L</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Z</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-colour.html#vips-col-XYZ2Lab" title="vips_col_XYZ2Lab ()">vips_col_XYZ2Lab</a>                    (<em class="parameter"><code><span class="type">float</span> X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Z</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *L</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *b</code></em>);
<span class="returnvalue">double</span>              <a class="link" href="libvips-colour.html#vips-col-ab2h" title="vips_col_ab2h ()">vips_col_ab2h</a>                       (<em class="parameter"><code><span class="type">double</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> b</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-colour.html#vips-col-ab2Ch" title="vips_col_ab2Ch ()">vips_col_ab2Ch</a>                      (<em class="parameter"><code><span class="type">float</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *h</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-colour.html#vips-col-Ch2ab" title="vips_col_Ch2ab ()">vips_col_Ch2ab</a>                      (<em class="parameter"><code><span class="type">float</span> C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> h</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *b</code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-col-L2Lcmc" title="vips_col_L2Lcmc ()">vips_col_L2Lcmc</a>                     (<em class="parameter"><code><span class="type">float</span> L</code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-col-C2Ccmc" title="vips_col_C2Ccmc ()">vips_col_C2Ccmc</a>                     (<em class="parameter"><code><span class="type">float</span> C</code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-col-Ch2hcmc" title="vips_col_Ch2hcmc ()">vips_col_Ch2hcmc</a>                    (<em class="parameter"><code><span class="type">float</span> C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> h</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-colour.html#vips-col-make-tables-CMC" title="vips_col_make_tables_CMC ()">vips_col_make_tables_CMC</a>            (<em class="parameter"><code><span class="type">void</span></code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-col-Lcmc2L" title="vips_col_Lcmc2L ()">vips_col_Lcmc2L</a>                     (<em class="parameter"><code><span class="type">float</span> Lcmc</code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-col-Ccmc2C" title="vips_col_Ccmc2C ()">vips_col_Ccmc2C</a>                     (<em class="parameter"><code><span class="type">float</span> Ccmc</code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-col-Chcmc2h" title="vips_col_Chcmc2h ()">vips_col_Chcmc2h</a>                    (<em class="parameter"><code><span class="type">float</span> C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> hcmc</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-col-sRGB2scRGB-8" title="vips_col_sRGB2scRGB_8 ()">vips_col_sRGB2scRGB_8</a>               (<em class="parameter"><code><span class="type">int</span> r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *B</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-col-sRGB2scRGB-16" title="vips_col_sRGB2scRGB_16 ()">vips_col_sRGB2scRGB_16</a>              (<em class="parameter"><code><span class="type">int</span> r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *B</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-col-scRGB2XYZ" title="vips_col_scRGB2XYZ ()">vips_col_scRGB2XYZ</a>                  (<em class="parameter"><code><span class="type">float</span> R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> B</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Z</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-col-XYZ2scRGB" title="vips_col_XYZ2scRGB ()">vips_col_XYZ2scRGB</a>                  (<em class="parameter"><code><span class="type">float</span> X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Z</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *B</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-col-scRGB2sRGB-8" title="vips_col_scRGB2sRGB_8 ()">vips_col_scRGB2sRGB_8</a>               (<em class="parameter"><code><span class="type">float</span> R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> B</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *b</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *or_ret</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-colour.html#vips-col-scRGB2sRGB-16" title="vips_col_scRGB2sRGB_16 ()">vips_col_scRGB2sRGB_16</a>              (<em class="parameter"><code><span class="type">float</span> R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> B</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *b</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *or_ret</code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-pythagoras" title="vips_pythagoras ()">vips_pythagoras</a>                     (<em class="parameter"><code><span class="type">float</span> L1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> L2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b2</code></em>);
<span class="returnvalue">float</span>               <a class="link" href="libvips-colour.html#vips-col-dE00" title="vips_col_dE00 ()">vips_col_dE00</a>                       (<em class="parameter"><code><span class="type">float</span> L1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> L2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b2</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libvips-colour.description"></a><h2>Description</h2>
<p>
These operators let you transform coordinates and images between colour 
spaces, calculate colour differences, and move 
to and from device spaces.
</p>
<p>
Radiance images have four 8-bits bands and store 8 bits of R, G and B and
another 8 bits of exponent, common to all channels. They are widely used in
the HDR imaging community.
</p>
<p>
The colour functions can be divided into three main groups. First, 
functions to transform images between the different colour spaces supported 
by VIPS: <span class="emphasis"><em>RGB</em></span>, <span class="emphasis"><em>sRGB</em></span>,  
<span class="emphasis"><em>XYZ</em></span>, <span class="emphasis"><em>Yxy</em></span>, 
<span class="emphasis"><em>Lab</em></span>, <span class="emphasis"><em>LabQ</em></span>, 
<span class="emphasis"><em>LabS</em></span>, <span class="emphasis"><em>LCh</em></span> and
<span class="emphasis"><em>CMC</em></span>). Use <a class="link" href="libvips-colour.html#vips-colourspace" title="vips_colourspace ()"><code class="function">vips_colourspace()</code></a> to move an image to a
target colourspace using the best sequence of colour transform operations. 
Secondly, there are a set of operations for 
calculating colour difference metrics. Finally, VIPS wraps LittleCMS and
uses it to provide a set of operations for reading and writing images with
ICC profiles.
</p>
<p>
This figure shows how the VIPS colour spaces interconvert:
</p>
<p>
<img src="interconvert.png">
</p>
<p>
The colour spaces supported by VIPS are:
</p>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">LabQ</code></em></span>
</p>
<p>
 This is the principal VIPS colorimetric storage format. 
	 LabQ images have four 8-bit bands and store 10 bits of L and 11 bits 
	 of a and b.
</p>
<p>
	 You cannot perform calculations on <code class="code">LabQ</code> images (they are
	 tagged with <a class="link" href="VipsImage.html#VIPS-CODING-LABQ:CAPS"><code class="literal">VIPS_CODING_LABQ</code></a>), though a few operations such as
	 <a class="link" href="libvips-conversion.html#vips-extract-area" title="vips_extract_area ()"><code class="function">vips_extract_area()</code></a> will work directly with them.
    </p>
</li>
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">LabS</code></em></span>
</p>
<p>
 This format represents coordinates in CIELAB space as a 
 three-band <a class="link" href="VipsImage.html#VIPS-FORMAT-SHORT:CAPS"><span class="type">VIPS_FORMAT_SHORT</span></a> image, scaled to fit the full range of 
 bits. It is the best format for computation, being relatively 
 compact, quick, and accurate. Colour values expressed in this way 
 are hard to visualise.
    </p>
</li>
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">Lab</code></em></span>
</p>
<p>
	 Lab colourspace represents CIELAB colour values with a three-band
 <a class="link" href="VipsImage.html#VIPS-FORMAT-FLOAT:CAPS"><span class="type">VIPS_FORMAT_FLOAT</span></a> image. This is the simplest format for general 
 work: adding the constant 50 to the L channel, for example, has the 
 expected result.
</p>
<p>
 VIPS uses D65 LAB, but you can use other colour temperatures with a
 little effort, see <a class="link" href="libvips-colour.html#vips-XYZ2Lab" title="vips_XYZ2Lab ()"><code class="function">vips_XYZ2Lab()</code></a>.
    </p>
</li>
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">XYZ</code></em></span>
</p>
<p>
	 CIE XYZ colour space represented as a three-band <a class="link" href="VipsImage.html#VIPS-FORMAT-FLOAT:CAPS"><span class="type">VIPS_FORMAT_FLOAT</span></a>
 image.
    </p>
</li>
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">Yxy</code></em></span>
</p>
<p>
	 CIE Yxy colour space represented as a three-band <a class="link" href="VipsImage.html#VIPS-FORMAT-FLOAT:CAPS"><span class="type">VIPS_FORMAT_FLOAT</span></a>
 image.
    </p>
</li>
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">RGB</code> / <code class="code">sRGB</code></em></span>
</p>
<p>
	 VIPS converts XYZ to and from sRGB using the usual formula:
</p>
<p>
	   http://en.wikipedia.org/wiki/SRGB
</p>
<p>
	 You can also use <a class="link" href="libvips-colour.html#vips-icc-transform" title="vips_icc_transform ()"><code class="function">vips_icc_transform()</code></a> and friends to go to and from
	 device space with a generic profile. 
    </p>
</li>
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">LCh</code></em></span>
</p>
<p>
	 Like <code class="code">Lab</code>, but rectangular <code class="code">ab</code> coordinates 
	 are replaced with 
	 polar <code class="code">Ch</code> (Chroma and hue) coordinates. 
	 Hue angles are expressed in degrees.
    </p>
</li>
<li class="listitem">
<p>
      <span class="emphasis"><em><code class="code">CMC</code></em></span>
</p>
<p>
      A colour space based on the CMC(1:1) colour difference measurement. 
      This is a highly uniform colour space, much better than CIELAB for 
      expressing small differences. 
</p>
<p>
      You can calculate metrics like CMC(2:1) by scaling the spaces before
      finding differences. 
    </p>
</li>
</ul></div>
<p>
</p>
</div>
<div class="refsect1">
<a name="libvips-colour.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="VIPS-D93-X0:CAPS"></a><h3>VIPS_D93_X0</h3>
<pre class="programlisting">#define VIPS_D93_X0 (89.7400)
</pre>
<p>
Areas under curves for D93, 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D93-Y0:CAPS"></a><h3>VIPS_D93_Y0</h3>
<pre class="programlisting">#define VIPS_D93_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D93-Z0:CAPS"></a><h3>VIPS_D93_Z0</h3>
<pre class="programlisting">#define VIPS_D93_Z0 (130.7700)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D75-X0:CAPS"></a><h3>VIPS_D75_X0</h3>
<pre class="programlisting">#define VIPS_D75_X0 (94.9682)
</pre>
<p>
Areas under curves for D75, 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D75-Y0:CAPS"></a><h3>VIPS_D75_Y0</h3>
<pre class="programlisting">#define VIPS_D75_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D75-Z0:CAPS"></a><h3>VIPS_D75_Z0</h3>
<pre class="programlisting">#define VIPS_D75_Z0 (122.5710)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D65-X0:CAPS"></a><h3>VIPS_D65_X0</h3>
<pre class="programlisting">#define VIPS_D65_X0 (95.0470)
</pre>
<p>
Areas under curves for D65, 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D65-Y0:CAPS"></a><h3>VIPS_D65_Y0</h3>
<pre class="programlisting">#define VIPS_D65_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D65-Z0:CAPS"></a><h3>VIPS_D65_Z0</h3>
<pre class="programlisting">#define VIPS_D65_Z0 (108.8827)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D55-X0:CAPS"></a><h3>VIPS_D55_X0</h3>
<pre class="programlisting">#define VIPS_D55_X0 (95.6831)
</pre>
<p>
Areas under curves for D55, 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D55-Y0:CAPS"></a><h3>VIPS_D55_Y0</h3>
<pre class="programlisting">#define VIPS_D55_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D55-Z0:CAPS"></a><h3>VIPS_D55_Z0</h3>
<pre class="programlisting">#define VIPS_D55_Z0 (92.0871)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D50-X0:CAPS"></a><h3>VIPS_D50_X0</h3>
<pre class="programlisting">#define VIPS_D50_X0 (96.4250)
</pre>
<p>
Areas under curves for D50, 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D50-Y0:CAPS"></a><h3>VIPS_D50_Y0</h3>
<pre class="programlisting">#define VIPS_D50_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D50-Z0:CAPS"></a><h3>VIPS_D50_Z0</h3>
<pre class="programlisting">#define VIPS_D50_Z0 (82.4680)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-A-X0:CAPS"></a><h3>VIPS_A_X0</h3>
<pre class="programlisting">#define VIPS_A_X0 (109.8503)
</pre>
<p>
Areas under curves for illuminant A (2856K), 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-A-Y0:CAPS"></a><h3>VIPS_A_Y0</h3>
<pre class="programlisting">#define VIPS_A_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-A-Z0:CAPS"></a><h3>VIPS_A_Z0</h3>
<pre class="programlisting">#define VIPS_A_Z0 (35.5849)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-B-X0:CAPS"></a><h3>VIPS_B_X0</h3>
<pre class="programlisting">#define VIPS_B_X0 (99.0720)
</pre>
<p>
Areas under curves for illuminant B (4874K), 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-B-Y0:CAPS"></a><h3>VIPS_B_Y0</h3>
<pre class="programlisting">#define VIPS_B_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-B-Z0:CAPS"></a><h3>VIPS_B_Z0</h3>
<pre class="programlisting">#define VIPS_B_Z0 (85.2230)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-C-X0:CAPS"></a><h3>VIPS_C_X0</h3>
<pre class="programlisting">#define VIPS_C_X0 (98.0700)
</pre>
<p>
Areas under curves for illuminant C (6774K), 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-C-Y0:CAPS"></a><h3>VIPS_C_Y0</h3>
<pre class="programlisting">#define VIPS_C_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-C-Z0:CAPS"></a><h3>VIPS_C_Z0</h3>
<pre class="programlisting">#define VIPS_C_Z0 (118.2300)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-E-X0:CAPS"></a><h3>VIPS_E_X0</h3>
<pre class="programlisting">#define VIPS_E_X0 (100.0)
</pre>
<p>
Areas under curves for equal energy illuminant E.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-E-Y0:CAPS"></a><h3>VIPS_E_Y0</h3>
<pre class="programlisting">#define VIPS_E_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-E-Z0:CAPS"></a><h3>VIPS_E_Z0</h3>
<pre class="programlisting">#define VIPS_E_Z0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D3250-X0:CAPS"></a><h3>VIPS_D3250_X0</h3>
<pre class="programlisting">#define VIPS_D3250_X0 (105.6590)
</pre>
<p>
Areas under curves for black body at 3250K, 2 degree observer.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D3250-Y0:CAPS"></a><h3>VIPS_D3250_Y0</h3>
<pre class="programlisting">#define VIPS_D3250_Y0 (100.0)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-D3250-Z0:CAPS"></a><h3>VIPS_D3250_Z0</h3>
<pre class="programlisting">#define VIPS_D3250_Z0 (45.8501)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsIntent"></a><h3>enum VipsIntent</h3>
<pre class="programlisting">typedef enum {
	VIPS_INTENT_PERCEPTUAL = 0,
	VIPS_INTENT_RELATIVE,
	VIPS_INTENT_SATURATION,
	VIPS_INTENT_ABSOLUTE
} VipsIntent;
</pre>
<p>
The rendering intent. <a class="link" href="libvips-colour.html#VIPS-INTENT-ABSOLUTE:CAPS"><span class="type">VIPS_INTENT_ABSOLUTE</span></a> is best for
scientific work, <a class="link" href="libvips-colour.html#VIPS-INTENT-RELATIVE:CAPS"><span class="type">VIPS_INTENT_RELATIVE</span></a> is usually best for 
accurate communication with other imaging libraries.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-INTENT-PERCEPTUAL:CAPS"></a><span class="term"><code class="literal">VIPS_INTENT_PERCEPTUAL</code></span></p></td>
<td>perceptual rendering intent
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTENT-RELATIVE:CAPS"></a><span class="term"><code class="literal">VIPS_INTENT_RELATIVE</code></span></p></td>
<td>relative colorimetric rendering intent
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTENT-SATURATION:CAPS"></a><span class="term"><code class="literal">VIPS_INTENT_SATURATION</code></span></p></td>
<td>saturation rendering intent
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTENT-ABSOLUTE:CAPS"></a><span class="term"><code class="literal">VIPS_INTENT_ABSOLUTE</code></span></p></td>
<td>absolute colorimetric rendering intent
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsPCS"></a><h3>enum VipsPCS</h3>
<pre class="programlisting">typedef enum {
	VIPS_PCS_LAB,
	VIPS_PCS_XYZ,
	VIPS_PCS_LAST
} VipsPCS;
</pre>
<p>
Pick a Profile Connection Space for <a class="link" href="libvips-colour.html#vips-icc-import" title="vips_icc_import ()"><code class="function">vips_icc_import()</code></a> and
<a class="link" href="libvips-colour.html#vips-icc-export" title="vips_icc_export ()"><code class="function">vips_icc_export()</code></a>. LAB is usually best, XYZ can be more convenient in some 
cases.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-PCS-LAB:CAPS"></a><span class="term"><code class="literal">VIPS_PCS_LAB</code></span></p></td>
<td>use CIELAB D65 as the Profile Connection Space
</td>
</tr>
<tr>
<td><p><a name="VIPS-PCS-XYZ:CAPS"></a><span class="term"><code class="literal">VIPS_PCS_XYZ</code></span></p></td>
<td>use XYZ as the Profile Connection Space
</td>
</tr>
<tr>
<td><p><a name="VIPS-PCS-LAST:CAPS"></a><span class="term"><code class="literal">VIPS_PCS_LAST</code></span></p></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-colourspace-issupported"></a><h3>vips_colourspace_issupported ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            vips_colourspace_issupported        (<em class="parameter"><code>const <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Test if <em class="parameter"><code>image</code></em> is in a colourspace that <a class="link" href="libvips-colour.html#vips-colourspace" title="vips_colourspace ()"><code class="function">vips_colourspace()</code></a> can process. For
example, <a class="link" href="VipsImage.html#VIPS-INTERPRETATION-RGB:CAPS"><span class="type">VIPS_INTERPRETATION_RGB</span></a> images are not in a well-defined 
colourspace, but <a class="link" href="VipsImage.html#VIPS-INTERPRETATION-sRGB"><span class="type">VIPS_INTERPRETATION_sRGB</span></a> ones are.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if <em class="parameter"><code>image</code></em> is in a supported colourspace.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-colourspace"></a><h3>vips_colourspace ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_colourspace                    (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html#VipsInterpretation" title="enum VipsInterpretation"><span class="type">VipsInterpretation</span></a> space</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
This operation looks at the interpretation field of <em class="parameter"><code>in</code></em> and runs
a set of colourspace conversion functions to move it to <em class="parameter"><code>space</code></em>. 
</p>
<p>
For example, given an image tagged as <a class="link" href="VipsImage.html#VIPS-INTERPRETATION-YXY:CAPS"><span class="type">VIPS_INTERPRETATION_YXY</span></a>, running
<a class="link" href="libvips-colour.html#vips-colourspace" title="vips_colourspace ()"><code class="function">vips_colourspace()</code></a> with <em class="parameter"><code>space</code></em> set to <a class="link" href="VipsImage.html#VIPS-INTERPRETATION-LAB:CAPS"><span class="type">VIPS_INTERPRETATION_LAB</span></a> will
convert with <a class="link" href="libvips-colour.html#vips-Yxy2XYZ" title="vips_Yxy2XYZ ()"><code class="function">vips_Yxy2XYZ()</code></a> and <a class="link" href="libvips-colour.html#vips-XYZ2Lab" title="vips_XYZ2Lab ()"><code class="function">vips_XYZ2Lab()</code></a>.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-colourspace-issupported" title="vips_colourspace_issupported ()"><code class="function">vips_colourspace_issupported()</code></a>,
<a class="link" href="libvips-header.html#vips-image-guess-interpretation" title="vips_image_guess_interpretation ()"><code class="function">vips_image_guess_interpretation()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>space</code></em> :</span></p></td>
<td>convert to this colour space</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-LabQ2sRGB"></a><h3>vips_LabQ2sRGB ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_LabQ2sRGB                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Unpack a LabQ (<a class="link" href="VipsImage.html#VIPS-CODING-LABQ:CAPS"><span class="type">VIPS_CODING_LABQ</span></a>) image to a three-band short image.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabS2LabQ" title="vips_LabS2LabQ ()"><code class="function">vips_LabS2LabQ()</code></a>, <a class="link" href="libvips-colour.html#vips-LabQ2sRGB" title="vips_LabQ2sRGB ()"><code class="function">vips_LabQ2sRGB()</code></a>, <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()"><code class="function">vips_rad2float()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rad2float"></a><h3>vips_rad2float ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_rad2float                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Unpack a RAD (<span class="type">IM_CODING_RAD</span>) image to a three-band float image.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-float2rad" title="vips_float2rad ()"><code class="function">vips_float2rad()</code></a>, <a class="link" href="libvips-colour.html#vips-LabQ2LabS" title="vips_LabQ2LabS ()"><code class="function">vips_LabQ2LabS()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-float2rad"></a><h3>vips_float2rad ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_float2rad                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Convert a three-band float image to Radiance 32-bit packed format.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()"><code class="function">vips_rad2float()</code></a>, <span class="type">VipsFormatRad</span>, <a class="link" href="libvips-colour.html#vips-LabQ2Lab" title="vips_LabQ2Lab ()"><code class="function">vips_LabQ2Lab()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-LabS2LabQ"></a><h3>vips_LabS2LabQ ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_LabS2LabQ                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Convert a LabS three-band signed short image to LabQ
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabQ2LabS" title="vips_LabQ2LabS ()"><code class="function">vips_LabQ2LabS()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-LabQ2LabS"></a><h3>vips_LabQ2LabS ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_LabQ2LabS                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Unpack a LabQ (<span class="type">IM_CODING_LABQ</span>) image to a three-band short image.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabS2LabQ" title="vips_LabS2LabQ ()"><code class="function">vips_LabS2LabQ()</code></a>, <a class="link" href="libvips-colour.html#vips-LabQ2LabS" title="vips_LabQ2LabS ()"><code class="function">vips_LabQ2LabS()</code></a>, <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()"><code class="function">vips_rad2float()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-LabQ2Lab"></a><h3>vips_LabQ2Lab ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_LabQ2Lab                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Unpack a LabQ (<span class="type">IM_CODING_LABQ</span>) image to a three-band float image.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabQ2Lab" title="vips_LabQ2Lab ()"><code class="function">vips_LabQ2Lab()</code></a>, <a class="link" href="libvips-colour.html#vips-LabQ2LabS" title="vips_LabQ2LabS ()"><code class="function">vips_LabQ2LabS()</code></a>, <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()"><code class="function">vips_rad2float()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-Lab2LabQ"></a><h3>vips_Lab2LabQ ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_Lab2LabQ                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Convert a Lab three-band float image to LabQ (<span class="type">IM_CODING_LABQ</span>).
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabQ2Lab" title="vips_LabQ2Lab ()"><code class="function">vips_LabQ2Lab()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-LCh2Lab"></a><h3>vips_LCh2Lab ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_LCh2Lab                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn LCh to Lab.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-Lab2LCh"></a><h3>vips_Lab2LCh ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_Lab2LCh                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn Lab to LCh.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-Yxy2Lab"></a><h3>vips_Yxy2Lab ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_Yxy2Lab                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-CMC2XYZ"></a><h3>vips_CMC2XYZ ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_CMC2XYZ                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-Lab2XYZ"></a><h3>vips_Lab2XYZ ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_Lab2XYZ                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
optional arguments:
</p>
<p>
<em class="parameter"><code>temp</code></em>: colour temperature
</p>
<p>
Turn Lab to XYZ. The colour temperature defaults to D65, but can be 
specified with <em class="parameter"><code>temp</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-XYZ2Lab"></a><h3>vips_XYZ2Lab ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_XYZ2Lab                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
optional arguments:
</p>
<p>
<em class="parameter"><code>temp</code></em>: colour temperature
</p>
<p>
Turn XYZ to Lab, optionally specifying the colour temperature. <em class="parameter"><code>temp</code></em>
defaults to D65.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-XYZ2scRGB"></a><h3>vips_XYZ2scRGB ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_XYZ2scRGB                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn XYZ to Yxy.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-scRGB2sRGB"></a><h3>vips_scRGB2sRGB ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_scRGB2sRGB                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Optional arguments:
</p>
<p>
<em class="parameter"><code>depth</code></em>: depth of output image in bits
</p>
<p>
Convert an scRGB image to sRGB. Set <em class="parameter"><code>depth</code></em> to 16 to get 16-bit output.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabS2LabQ" title="vips_LabS2LabQ ()"><code class="function">vips_LabS2LabQ()</code></a>, <a class="link" href="libvips-colour.html#vips-scRGB2sRGB" title="vips_scRGB2sRGB ()"><code class="function">vips_scRGB2sRGB()</code></a>, <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()"><code class="function">vips_rad2float()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-sRGB2scRGB"></a><h3>vips_sRGB2scRGB ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_sRGB2scRGB                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Convert an sRGB image to scRGB.
</p>
<p>
See also: <code class="function">vips_sRGB2XYZ()</code>, <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()"><code class="function">vips_rad2float()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-scRGB2XYZ"></a><h3>vips_scRGB2XYZ ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_scRGB2XYZ                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn XYZ to scRGB.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-LCh2CMC"></a><h3>vips_LCh2CMC ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_LCh2CMC                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn LCh to CMC.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-CMC2LCh"></a><h3>vips_CMC2LCh ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_CMC2LCh                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn LCh to CMC.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-XYZ2Yxy"></a><h3>vips_XYZ2Yxy ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_XYZ2Yxy                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn XYZ to Yxy.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-Yxy2XYZ"></a><h3>vips_Yxy2XYZ ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_Yxy2XYZ                        (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn XYZ to Yxy.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-LabS2Lab"></a><h3>vips_LabS2Lab ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_LabS2Lab                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Convert a LabS three-band signed short image to a three-band float image.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabS2Lab" title="vips_LabS2Lab ()"><code class="function">vips_LabS2Lab()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-Lab2LabS"></a><h3>vips_Lab2LabS ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_Lab2LabS                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Turn Lab to LabS, signed 16-bit int fixed point.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-LabQ2Lab" title="vips_LabQ2Lab ()"><code class="function">vips_LabQ2Lab()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-icc-present"></a><h3>vips_icc_present ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_icc_present                    (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
VIPS can optionally be built without the ICC library. Use this function to
test for its availability.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-zero if the ICC library is present.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-icc-transform"></a><h3>vips_icc_transform ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_icc_transform                  (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *output_profile</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Optional arguments:
</p>
<p>
<em class="parameter"><code>input_profile</code></em>: get the input profile from here
<em class="parameter"><code>intent</code></em>: transform with this intent
<em class="parameter"><code>depth</code></em>: depth of output image in bits
<em class="parameter"><code>embedded</code></em>: use profile embedded in input image
</p>
<p>
Transform an image with a pair of ICC profiles. The input image is moved to
profile-connection space with the input profile and then to the output
space with the output profile.
</p>
<p>
If <em class="parameter"><code>embedded</code></em> is set, the input profile is taken from the input image
metadata, if present. If there is no embedded profile,
<em class="parameter"><code>input_profile</code></em> is used as a fall-back.
</p>
<p>
If <em class="parameter"><code>embedded</code></em> is not set, the input profile is taken from
<em class="parameter"><code>input_profile</code></em>. If <em class="parameter"><code>input_profile</code></em> is not supplied, the
metadata profile, if any, is used as a fall-back. 
</p>
<p>
Use <a class="link" href="libvips-colour.html#vips-icc-import" title="vips_icc_import ()"><code class="function">vips_icc_import()</code></a> and <a class="link" href="libvips-colour.html#vips-icc-export" title="vips_icc_export ()"><code class="function">vips_icc_export()</code></a> to do either the first or 
second half of this operation in isolation.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>output_profile</code></em> :</span></p></td>
<td>get the output profile from here</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-icc-import"></a><h3>vips_icc_import ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_icc_import                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Optional arguments:
</p>
<p>
<em class="parameter"><code>input_profile</code></em>: get the input profile from here
<em class="parameter"><code>intent</code></em>: transform with this intent
<em class="parameter"><code>embedded</code></em>: use profile embedded in input image
<em class="parameter"><code>pcs</code></em>: use XYZ or LAB PCS
</p>
<p>
Import an image from device space to D65 LAB with an ICC profile. If <em class="parameter"><code>pcs</code></em> is
set to <a class="link" href="libvips-colour.html#VIPS-PCS-XYZ:CAPS"><span class="type">VIPS_PCS_XYZ</span></a>, use CIE XYZ PCS instead. 
</p>
<p>
If <em class="parameter"><code>embedded</code></em> is set, the input profile is taken from the input image
metadata. If there is no embedded profile,
<em class="parameter"><code>input_profile_filename</code></em> is used as a fall-back.
</p>
<p>
If <em class="parameter"><code>embedded</code></em> is not set, the input profile is taken from
<em class="parameter"><code>input_profile</code></em>. If <em class="parameter"><code>input_profile</code></em> is not supplied, the
metadata profile, if any, is used as a fall-back.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-icc-export"></a><h3>vips_icc_export ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_icc_export                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Optional arguments:
</p>
<p>
<em class="parameter"><code>intent</code></em>: transform with this intent
<em class="parameter"><code>depth</code></em>: depth of output image in bits
<em class="parameter"><code>output_profile</code></em>: get the output profile from here
<em class="parameter"><code>pcs</code></em>: use XYZ or LAB PCS
</p>
<p>
Export an image from D65 LAB to device space with an ICC profile. 
If <em class="parameter"><code>pcs</code></em> is
set to <a class="link" href="libvips-colour.html#VIPS-PCS-XYZ:CAPS"><span class="type">VIPS_PCS_XYZ</span></a>, use CIE XYZ PCS instead. 
If <em class="parameter"><code>output_profile</code></em> is not set, use the embedded profile, if any. 
If <em class="parameter"><code>output_profile</code></em> is set, export with that and attach it to the output 
image.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-icc-ac2rc"></a><h3>vips_icc_ac2rc ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_icc_ac2rc                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *profile_filename</code></em>);</pre>
<p>
Transform an image from absolute to relative colorimetry using the
MediaWhitePoint stored in the ICC profile.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-icc-transform" title="vips_icc_transform ()"><code class="function">vips_icc_transform()</code></a>, <a class="link" href="libvips-colour.html#vips-icc-import" title="vips_icc_import ()"><code class="function">vips_icc_import()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>profile_filename</code></em> :</span></p></td>
<td>use this profile</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-dE76"></a><h3>vips_dE76 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_dE76                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *left</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *right</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Calculate dE 76.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>left</code></em> :</span></p></td>
<td>first input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>right</code></em> :</span></p></td>
<td>second input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-dE00"></a><h3>vips_dE00 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_dE00                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *left</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *right</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Calculate dE 00.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>left</code></em> :</span></p></td>
<td>first input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>right</code></em> :</span></p></td>
<td>second input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-dECMC"></a><h3>vips_dECMC ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_dECMC                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *left</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *right</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **out</code></em>,
                                                         <em class="parameter"><code>...</code></em>);</pre>
<p>
Calculate dE CMC. The input images are transformed to CMC colour space and
the euclidean distance between corresponding pixels calculated. 
</p>
<p>
To calculate a colour difference with values for (l:c) other than (1:1),
transform the two source images to CMC yourself, scale the channels
appropriately, and call this function.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-colourspace" title="vips_colourspace ()"><code class="function">vips_colourspace()</code></a>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>left</code></em> :</span></p></td>
<td>first input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>right</code></em> :</span></p></td>
<td>second input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-Lab2XYZ"></a><h3>vips_col_Lab2XYZ ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_col_Lab2XYZ                    (<em class="parameter"><code><span class="type">float</span> L</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Z</code></em>);</pre>
<p>
Calculate XYZ from Lab, D65.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-Lab2XYZ" title="vips_Lab2XYZ ()"><code class="function">vips_Lab2XYZ()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>L</code></em> :</span></p></td>
<td>Input CIE Lab value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>Input CIE Lab value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td>
<td>Input CIE Lab value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>X</code></em> :</span></p></td>
<td>Return CIE XYZ colour</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Y</code></em> :</span></p></td>
<td>Return CIE XYZ colour</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Z</code></em> :</span></p></td>
<td>Return CIE XYZ colour</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-XYZ2Lab"></a><h3>vips_col_XYZ2Lab ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_col_XYZ2Lab                    (<em class="parameter"><code><span class="type">float</span> X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Z</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *L</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *b</code></em>);</pre>
<p>
Calculate XYZ from Lab, D65.
</p>
<p>
See also: <a class="link" href="libvips-colour.html#vips-XYZ2Lab" title="vips_XYZ2Lab ()"><code class="function">vips_XYZ2Lab()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>X</code></em> :</span></p></td>
<td>Input CIE XYZ colour</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Y</code></em> :</span></p></td>
<td>Input CIE XYZ colour</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Z</code></em> :</span></p></td>
<td>Input CIE XYZ colour</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>L</code></em> :</span></p></td>
<td>Return CIE Lab value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>Return CIE Lab value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td>
<td>Return CIE Lab value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-ab2h"></a><h3>vips_col_ab2h ()</h3>
<pre class="programlisting"><span class="returnvalue">double</span>              vips_col_ab2h                       (<em class="parameter"><code><span class="type">double</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> b</code></em>);</pre>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>CIE a</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td>
<td>CIE b</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Hue (degrees)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-ab2Ch"></a><h3>vips_col_ab2Ch ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_col_ab2Ch                      (<em class="parameter"><code><span class="type">float</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *h</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-Ch2ab"></a><h3>vips_col_Ch2ab ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_col_Ch2ab                      (<em class="parameter"><code><span class="type">float</span> C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> h</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *a</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *b</code></em>);</pre>
<p>
Calculate ab from Ch, h in degrees.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>C</code></em> :</span></p></td>
<td>Chroma</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>h</code></em> :</span></p></td>
<td>Hue angle (degrees)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>return CIE a* value</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td>
<td>return CIE b* value</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-L2Lcmc"></a><h3>vips_col_L2Lcmc ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_col_L2Lcmc                     (<em class="parameter"><code><span class="type">float</span> L</code></em>);</pre>
<p>
Calculate Lcmc from L.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>L</code></em> :</span></p></td>
<td>CIE L*</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Lcmc</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-C2Ccmc"></a><h3>vips_col_C2Ccmc ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_col_C2Ccmc                     (<em class="parameter"><code><span class="type">float</span> C</code></em>);</pre>
<p>
Calculate Ccmc from C.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>C</code></em> :</span></p></td>
<td>Chroma</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Ccmc.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-Ch2hcmc"></a><h3>vips_col_Ch2hcmc ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_col_Ch2hcmc                    (<em class="parameter"><code><span class="type">float</span> C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> h</code></em>);</pre>
<p>
Calculate hcmc from C and h.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>C</code></em> :</span></p></td>
<td>Chroma</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>h</code></em> :</span></p></td>
<td>Hue (degrees)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>hcmc.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-make-tables-CMC"></a><h3>vips_col_make_tables_CMC ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_col_make_tables_CMC            (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Make the lookup tables for cmc.
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-Lcmc2L"></a><h3>vips_col_Lcmc2L ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_col_Lcmc2L                     (<em class="parameter"><code><span class="type">float</span> Lcmc</code></em>);</pre>
<p>
Calculate L from Lcmc using a table. Call <a class="link" href="libvips-colour.html#vips-col-make-tables-CMC" title="vips_col_make_tables_CMC ()"><code class="function">vips_col_make_tables_CMC()</code></a> at
least once before using this function.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>Lcmc</code></em> :</span></p></td>
<td>L cmc</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>L*</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-Ccmc2C"></a><h3>vips_col_Ccmc2C ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_col_Ccmc2C                     (<em class="parameter"><code><span class="type">float</span> Ccmc</code></em>);</pre>
<p>
Calculate C from Ccmc using a table. 
Call <a class="link" href="libvips-colour.html#vips-col-make-tables-CMC" title="vips_col_make_tables_CMC ()"><code class="function">vips_col_make_tables_CMC()</code></a> at
least once before using this function.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>Ccmc</code></em> :</span></p></td>
<td>Ccmc</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>C.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-Chcmc2h"></a><h3>vips_col_Chcmc2h ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_col_Chcmc2h                    (<em class="parameter"><code><span class="type">float</span> C</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> hcmc</code></em>);</pre>
<p>
Calculate h from C and hcmc, using a table.
Call <a class="link" href="libvips-colour.html#vips-col-make-tables-CMC" title="vips_col_make_tables_CMC ()"><code class="function">vips_col_make_tables_CMC()</code></a> at
least once before using this function.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>C</code></em> :</span></p></td>
<td>Chroma</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hcmc</code></em> :</span></p></td>
<td>Hue cmc (degrees)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>h.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-sRGB2scRGB-8"></a><h3>vips_col_sRGB2scRGB_8 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_col_sRGB2scRGB_8               (<em class="parameter"><code><span class="type">int</span> r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *B</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-sRGB2scRGB-16"></a><h3>vips_col_sRGB2scRGB_16 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_col_sRGB2scRGB_16              (<em class="parameter"><code><span class="type">int</span> r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *B</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-scRGB2XYZ"></a><h3>vips_col_scRGB2XYZ ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_col_scRGB2XYZ                  (<em class="parameter"><code><span class="type">float</span> R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> B</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *Z</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-XYZ2scRGB"></a><h3>vips_col_XYZ2scRGB ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_col_XYZ2scRGB                  (<em class="parameter"><code><span class="type">float</span> X</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Y</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> Z</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> *B</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-scRGB2sRGB-8"></a><h3>vips_col_scRGB2sRGB_8 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_col_scRGB2sRGB_8               (<em class="parameter"><code><span class="type">float</span> R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> B</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *b</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *or_ret</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-scRGB2sRGB-16"></a><h3>vips_col_scRGB2sRGB_16 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 vips_col_scRGB2sRGB_16              (<em class="parameter"><code><span class="type">float</span> R</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> G</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> B</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *g</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *b</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *or_ret</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-pythagoras"></a><h3>vips_pythagoras ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_pythagoras                     (<em class="parameter"><code><span class="type">float</span> L1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> L2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b2</code></em>);</pre>
<p>
Pythagorean distance between two points in colour space. Lab/XYZ/CMC etc.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>L1</code></em> :</span></p></td>
<td>Input coordinate 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a1</code></em> :</span></p></td>
<td>Input coordinate 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b1</code></em> :</span></p></td>
<td>Input coordinate 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>L2</code></em> :</span></p></td>
<td>Input coordinate 2</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a2</code></em> :</span></p></td>
<td>Input coordinate 2</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b2</code></em> :</span></p></td>
<td>Input coordinate 2</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-col-dE00"></a><h3>vips_col_dE00 ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span>               vips_col_dE00                       (<em class="parameter"><code><span class="type">float</span> L1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b1</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> L2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> a2</code></em>,
                                                         <em class="parameter"><code><span class="type">float</span> b2</code></em>);</pre>
<p>
CIEDE2000, from: 
</p>
<p>
Luo, Cui, Rigg, "The Development of the CIE 2000 Colour-Difference 
Formula: CIEDE2000", COLOR research and application, pp 340
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>L1</code></em> :</span></p></td>
<td>Input coordinate 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a1</code></em> :</span></p></td>
<td>Input coordinate 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b1</code></em> :</span></p></td>
<td>Input coordinate 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>L2</code></em> :</span></p></td>
<td>Input coordinate 2</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a2</code></em> :</span></p></td>
<td>Input coordinate 2</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b2</code></em> :</span></p></td>
<td>Input coordinate 2</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>CIE dE2000 colour difference.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="libvips-colour.see-also"></a><h2>See Also</h2>
<a class="link" href="libvips-arithmetic.html" title="arithmetic">arithmetic</a>
</div>
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