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<h2><span class="refentrytitle"><a name="VipsImage.top_of_page"></a>VipsImage</span></h2>
<p>VipsImage — the VIPS image class</p>
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<div class="refsect1">
<a name="VipsImage.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
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<div class="refsynopsisdiv">
<a name="VipsImage.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <vips/vips.h>
#define <a class="link" href="VipsImage.html#VIPS-MAGIC-INTEL:CAPS" title="VIPS_MAGIC_INTEL">VIPS_MAGIC_INTEL</a>
#define <a class="link" href="VipsImage.html#VIPS-MAGIC-SPARC:CAPS" title="VIPS_MAGIC_SPARC">VIPS_MAGIC_SPARC</a>
enum <a class="link" href="VipsImage.html#VipsDemandStyle" title="enum VipsDemandStyle">VipsDemandStyle</a>;
enum <a class="link" href="VipsImage.html#VipsImageType" title="enum VipsImageType">VipsImageType</a>;
enum <a class="link" href="VipsImage.html#VipsInterpretation" title="enum VipsInterpretation">VipsInterpretation</a>;
enum <a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat">VipsBandFormat</a>;
enum <a class="link" href="VipsImage.html#VipsCoding" title="enum VipsCoding">VipsCoding</a>;
enum <a class="link" href="VipsImage.html#VipsAccess" title="enum VipsAccess">VipsAccess</a>;
<a class="link" href="VipsImage.html#VipsProgress" title="VipsProgress">VipsProgress</a>;
<a class="link" href="VipsImage.html#VipsImage-struct" title="VipsImage">VipsImage</a>;
<a class="link" href="VipsImage.html#VipsImageClass" title="VipsImageClass">VipsImageClass</a>;
#define <a class="link" href="VipsImage.html#VIPS-IMAGE-SIZEOF-ELEMENT:CAPS" title="VIPS_IMAGE_SIZEOF_ELEMENT()">VIPS_IMAGE_SIZEOF_ELEMENT</a> (I)
#define <a class="link" href="VipsImage.html#VIPS-IMAGE-SIZEOF-PEL:CAPS" title="VIPS_IMAGE_SIZEOF_PEL()">VIPS_IMAGE_SIZEOF_PEL</a> (I)
#define <a class="link" href="VipsImage.html#VIPS-IMAGE-SIZEOF-LINE:CAPS" title="VIPS_IMAGE_SIZEOF_LINE()">VIPS_IMAGE_SIZEOF_LINE</a> (I)
#define <a class="link" href="VipsImage.html#VIPS-IMAGE-N-ELEMENTS:CAPS" title="VIPS_IMAGE_N_ELEMENTS()">VIPS_IMAGE_N_ELEMENTS</a> (I)
#define <a class="link" href="VipsImage.html#VIPS-IMAGE-N-PELS:CAPS" title="VIPS_IMAGE_N_PELS()">VIPS_IMAGE_N_PELS</a> (I)
#define <a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()">VIPS_IMAGE_ADDR</a> (I,
X,
Y)
#define <a class="link" href="VipsImage.html#VIPS-MATRIX:CAPS" title="VIPS_MATRIX()">VIPS_MATRIX</a> (I,
X,
Y)
<span class="returnvalue">int</span> <a class="link" href="VipsImage.html#vips-image-written" title="vips_image_written ()">vips_image_written</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-invalidate-all" title="vips_image_invalidate_all ()">vips_image_invalidate_all</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-minimise-all" title="vips_image_minimise_all ()">vips_image_minimise_all</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-preeval" title="vips_image_preeval ()">vips_image_preeval</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-eval" title="vips_image_eval ()">vips_image_eval</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">guint64</span> processed</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-posteval" title="vips_image_posteval ()">vips_image_posteval</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-set-progress" title="vips_image_set_progress ()">vips_image_set_progress</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> progress</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-image-iskilled" title="vips_image_iskilled ()">vips_image_iskilled</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-set-kill" title="vips_image_set_kill ()">vips_image_set_kill</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> kill</code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()">vips_image_new</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-mode" title="vips_image_new_mode ()">vips_image_new_mode</a> (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mode</code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-buffer" title="vips_image_new_buffer ()">vips_image_new_buffer</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()">vips_image_new_from_file</a> (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-from-file-raw" title="vips_image_new_from_file_raw ()">vips_image_new_from_file_raw</a> (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
<em class="parameter"><code><span class="type">int</span> xsize</code></em>,
<em class="parameter"><code><span class="type">int</span> ysize</code></em>,
<em class="parameter"><code><span class="type">int</span> bands</code></em>,
<em class="parameter"><code><span class="type">guint64</span> offset</code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-from-memory" title="vips_image_new_from_memory ()">vips_image_new_from_memory</a> (<em class="parameter"><code><span class="type">void</span> *buffer</code></em>,
<em class="parameter"><code><span class="type">int</span> xsize</code></em>,
<em class="parameter"><code><span class="type">int</span> ysize</code></em>,
<em class="parameter"><code><span class="type">int</span> bands</code></em>,
<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> bandfmt</code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-matrix" title="vips_image_new_matrix ()">vips_image_new_matrix</a> (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-matrixv" title="vips_image_new_matrixv ()">vips_image_new_matrixv</a> (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code>...</code></em>);
<span class="returnvalue">void</span> <a class="link" href="VipsImage.html#vips-image-set-delete-on-close" title="vips_image_set_delete_on_close ()">vips_image_set_delete_on_close</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> delete_on_close</code></em>);
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * <a class="link" href="VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()">vips_image_new_temp_file</a> (<em class="parameter"><code>const <span class="type">char</span> *format</code></em>);
<span class="returnvalue">int</span> <a class="link" href="VipsImage.html#vips-image-write" title="vips_image_write ()">vips_image_write</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span> <a class="link" href="VipsImage.html#vips-image-write-to-file" title="vips_image_write_to_file ()">vips_image_write_to_file</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-image-isMSBfirst" title="vips_image_isMSBfirst ()">vips_image_isMSBfirst</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-image-isfile" title="vips_image_isfile ()">vips_image_isfile</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-image-ispartial" title="vips_image_ispartial ()">vips_image_ispartial</a> (<em class="parameter"><code><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="VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()">vips_image_wio_input</a> (<em class="parameter"><code><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="VipsImage.html#vips-image-pio-input" title="vips_image_pio_input ()">vips_image_pio_input</a> (<em class="parameter"><code><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="VipsImage.html#vips-image-inplace" title="vips_image_inplace ()">vips_image_inplace</a> (<em class="parameter"><code><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="VipsImage.html#vips-image-write-prepare" title="vips_image_write_prepare ()">vips_image_write_prepare</a> (<em class="parameter"><code><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="VipsImage.html#vips-image-write-line" title="vips_image_write_line ()">vips_image_write_line</a> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">int</span> ypos</code></em>,
<em class="parameter"><code><span class="type">VipsPel</span> *linebuffer</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-band-format-isint" title="vips_band_format_isint ()">vips_band_format_isint</a> (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-band-format-isuint" title="vips_band_format_isuint ()">vips_band_format_isuint</a> (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-band-format-is8bit" title="vips_band_format_is8bit ()">vips_band_format_is8bit</a> (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-band-format-isfloat" title="vips_band_format_isfloat ()">vips_band_format_isfloat</a> (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="VipsImage.html#vips-band-format-iscomplex" title="vips_band_format_iscomplex ()">vips_band_format_iscomplex</a> (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);
<span class="returnvalue">int</span> <a class="link" href="VipsImage.html#vips-system" title="vips_system ()">vips_system</a> (<em class="parameter"><code>const <span class="type">char</span> *cmd_format</code></em>,
<em class="parameter"><code>...</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="VipsImage.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GObject
+----<a class="link" href="libvips-VipsArgument.html#VipsObject">VipsObject</a>
+----VipsImage
</pre>
</div>
<div class="refsect1">
<a name="VipsImage.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="VipsImage.html#VipsImage--bands" title='The "bands" property'>bands</a>" <span class="type">gint</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--coding" title='The "coding" property'>coding</a>" <a class="link" href="VipsImage.html#VipsCoding" title="enum VipsCoding"><span class="type">VipsCoding</span></a> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--demand" title='The "demand" property'>demand</a>" <a class="link" href="VipsImage.html#VipsDemandStyle" title="enum VipsDemandStyle"><span class="type">VipsDemandStyle</span></a> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--filename" title='The "filename" property'>filename</a>" <span class="type">gchar</span>* : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--foreign-buffer" title='The "foreign-buffer" property'>foreign-buffer</a>" <span class="type">gpointer</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--format" title='The "format" property'>format</a>" <a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--height" title='The "height" property'>height</a>" <span class="type">gint</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--interpretation" title='The "interpretation" property'>interpretation</a>" <a class="link" href="VipsImage.html#VipsInterpretation" title="enum VipsInterpretation"><span class="type">VipsInterpretation</span></a> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--kill" title='The "kill" property'>kill</a>" <span class="type">gboolean</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--mode" title='The "mode" property'>mode</a>" <span class="type">gchar</span>* : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--sizeof-header" title='The "sizeof-header" property'>sizeof-header</a>" <span class="type">guint64</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--width" title='The "width" property'>width</a>" <span class="type">gint</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--xoffset" title='The "xoffset" property'>xoffset</a>" <span class="type">gint</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--xres" title='The "xres" property'>xres</a>" <span class="type">gdouble</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--yoffset" title='The "yoffset" property'>yoffset</a>" <span class="type">gint</span> : Read / Write
"<a class="link" href="VipsImage.html#VipsImage--yres" title='The "yres" property'>yres</a>" <span class="type">gdouble</span> : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="VipsImage.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="VipsImage.html#VipsImage-eval" title='The "eval" signal'>eval</a>" : <code class="literal">Run Last</code>
"<a class="link" href="VipsImage.html#VipsImage-invalidate" title='The "invalidate" signal'>invalidate</a>" : <code class="literal">Action</code>
"<a class="link" href="VipsImage.html#VipsImage-minimise" title='The "minimise" signal'>minimise</a>" : <code class="literal">Action</code>
"<a class="link" href="VipsImage.html#VipsImage-posteval" title='The "posteval" signal'>posteval</a>" : <code class="literal">Run Last</code>
"<a class="link" href="VipsImage.html#VipsImage-preeval" title='The "preeval" signal'>preeval</a>" : <code class="literal">Run Last</code>
"<a class="link" href="VipsImage.html#VipsImage-written" title='The "written" signal'>written</a>" : <code class="literal">Action</code>
</pre>
</div>
<div class="refsect1">
<a name="VipsImage.description"></a><h2>Description</h2>
<p>
The image class and associated types and macros.
</p>
<p>
<a class="link" href="VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</code></a> and friends indicate the image IO style you
intend to use, transforming the underlying <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> structure if
necessary.
</p>
</div>
<div class="refsect1">
<a name="VipsImage.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="VIPS-MAGIC-INTEL:CAPS"></a><h3>VIPS_MAGIC_INTEL</h3>
<pre class="programlisting">#define VIPS_MAGIC_INTEL (0xb6a6f208U)
</pre>
<p>
The first four bytes of a VIPS file in Intel byte ordering.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-MAGIC-SPARC:CAPS"></a><h3>VIPS_MAGIC_SPARC</h3>
<pre class="programlisting">#define VIPS_MAGIC_SPARC (0x08f2a6b6U)
</pre>
<p>
The first four bytes of a VIPS file in SPARC byte ordering.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsDemandStyle"></a><h3>enum VipsDemandStyle</h3>
<pre class="programlisting">typedef enum {
VIPS_DEMAND_STYLE_ERROR = -1,
VIPS_DEMAND_STYLE_SMALLTILE,
VIPS_DEMAND_STYLE_FATSTRIP,
VIPS_DEMAND_STYLE_THINSTRIP,
VIPS_DEMAND_STYLE_ANY
} VipsDemandStyle;
</pre>
<p>
See <a class="link" href="libvips-generate.html#vips-image-pipelinev" title="vips_image_pipelinev ()"><code class="function">vips_image_pipelinev()</code></a>. Operations can hint to the VIPS image IO system about
the kind of demand geometry they prefer.
</p>
<p>
These demand styles are given below in order of increasing
restrictiveness. When demanding output from a pipeline,
<a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>
will use the most restrictive of the styles requested by the operations
in the pipeline.
</p>
<p>
<a class="link" href="VipsImage.html#VIPS-DEMAND-STYLE-THINSTRIP:CAPS"><span class="type">VIPS_DEMAND_STYLE_THINSTRIP</span></a> --- This operation would like to output strips
the width of the image and a few pels high. This is option suitable for
point-to-point operations, such as those in the arithmetic package.
</p>
<p>
This option is only efficient for cases where each output pel depends
upon the pel in the corresponding position in the input image.
</p>
<p>
<a class="link" href="VipsImage.html#VIPS-DEMAND-STYLE-FATSTRIP:CAPS"><span class="type">VIPS_DEMAND_STYLE_FATSTRIP</span></a> --- This operation would like to output strips
the width of the image and as high as possible. This option is suitable
for area operations which do not violently transform coordinates, such
as <a href="http://http://www.vips.ecs.soton.ac.uk/libvips-convolution.html#im-conv"><code class="function">im_conv()</code></a>.
</p>
<p>
<a class="link" href="VipsImage.html#VIPS-DEMAND-STYLE-SMALLTILE:CAPS"><span class="type">VIPS_DEMAND_STYLE_SMALLTILE</span></a> --- This is the most general demand format.
Output is demanded in small (around 100x100 pel) sections. This style works
reasonably efficiently, even for bizzare operations like 45 degree rotate.
</p>
<p>
<a class="link" href="VipsImage.html#VIPS-DEMAND-STYLE-ANY:CAPS"><span class="type">VIPS_DEMAND_STYLE_ANY</span></a> --- This image is not being demand-read from a disc
file (even indirectly) so any demand style is OK. It's used for things like
<code class="function">im_black()</code> where the pixels are calculated.
</p>
<p>
See also: <a class="link" href="libvips-generate.html#vips-image-pipelinev" title="vips_image_pipelinev ()"><code class="function">vips_image_pipelinev()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-DEMAND-STYLE-ERROR:CAPS"></a><span class="term"><code class="literal">VIPS_DEMAND_STYLE_ERROR</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-DEMAND-STYLE-SMALLTILE:CAPS"></a><span class="term"><code class="literal">VIPS_DEMAND_STYLE_SMALLTILE</code></span></p></td>
<td>demand in small (typically 64x64 pixel) tiles
</td>
</tr>
<tr>
<td><p><a name="VIPS-DEMAND-STYLE-FATSTRIP:CAPS"></a><span class="term"><code class="literal">VIPS_DEMAND_STYLE_FATSTRIP</code></span></p></td>
<td>demand in fat (typically 10 pixel high) strips
</td>
</tr>
<tr>
<td><p><a name="VIPS-DEMAND-STYLE-THINSTRIP:CAPS"></a><span class="term"><code class="literal">VIPS_DEMAND_STYLE_THINSTRIP</code></span></p></td>
<td>demand in thin (typically 1 pixel high) strips
</td>
</tr>
<tr>
<td><p><a name="VIPS-DEMAND-STYLE-ANY:CAPS"></a><span class="term"><code class="literal">VIPS_DEMAND_STYLE_ANY</code></span></p></td>
<td>demand geometry does not matter
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImageType"></a><h3>enum VipsImageType</h3>
<pre class="programlisting">typedef enum {
VIPS_IMAGE_ERROR = -1,
VIPS_IMAGE_NONE, /* no type set */
VIPS_IMAGE_SETBUF, /* malloced memory array */
VIPS_IMAGE_SETBUF_FOREIGN, /* memory array, don't free on close */
VIPS_IMAGE_OPENIN, /* input from fd with a window */
VIPS_IMAGE_MMAPIN, /* memory mapped input file */
VIPS_IMAGE_MMAPINRW, /* memory mapped read/write file */
VIPS_IMAGE_OPENOUT, /* output to fd */
VIPS_IMAGE_PARTIAL /* partial image */
} VipsImageType;
</pre>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-IMAGE-ERROR:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_ERROR</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-NONE:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_NONE</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-SETBUF:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_SETBUF</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-SETBUF-FOREIGN:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_SETBUF_FOREIGN</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-OPENIN:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_OPENIN</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-MMAPIN:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_MMAPIN</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-MMAPINRW:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_MMAPINRW</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-OPENOUT:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_OPENOUT</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-IMAGE-PARTIAL:CAPS"></a><span class="term"><code class="literal">VIPS_IMAGE_PARTIAL</code></span></p></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsInterpretation"></a><h3>enum VipsInterpretation</h3>
<pre class="programlisting">typedef enum {
VIPS_INTERPRETATION_ERROR = -1,
VIPS_INTERPRETATION_MULTIBAND = 0,
VIPS_INTERPRETATION_B_W = 1,
VIPS_INTERPRETATION_HISTOGRAM = 10,
VIPS_INTERPRETATION_XYZ = 12,
VIPS_INTERPRETATION_LAB = 13,
VIPS_INTERPRETATION_CMYK = 15,
VIPS_INTERPRETATION_LABQ = 16,
VIPS_INTERPRETATION_RGB = 17,
VIPS_INTERPRETATION_CMC = 18,
VIPS_INTERPRETATION_LCH = 19,
VIPS_INTERPRETATION_LABS = 21,
VIPS_INTERPRETATION_sRGB = 22,
VIPS_INTERPRETATION_YXY = 23,
VIPS_INTERPRETATION_FOURIER = 24,
VIPS_INTERPRETATION_RGB16 = 25,
VIPS_INTERPRETATION_GREY16 = 26,
VIPS_INTERPRETATION_MATRIX = 27,
VIPS_INTERPRETATION_scRGB = 28
} VipsInterpretation;
</pre>
<p>
How the values in an image should be interpreted. For example, a
three-band float image of type <a class="link" href="VipsImage.html#VIPS-INTERPRETATION-LAB:CAPS"><span class="type">VIPS_INTERPRETATION_LAB</span></a> should have its
pixels interpreted as coordinates in CIE Lab space.
</p>
<p>
These values are set by operations as hints to user-interfaces built on top
of VIPS to help them show images to the user in a meaningful way.
Operations do not use these values to decide their action.
</p>
<p>
The gaps in the numbering are historical and must be maintained. Allocate
new numbers from the end.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-INTERPRETATION-ERROR:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_ERROR</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-MULTIBAND:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_MULTIBAND</code></span></p></td>
<td>generic many-band image
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-B-W:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_B_W</code></span></p></td>
<td>some kind of single-band image
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-HISTOGRAM:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_HISTOGRAM</code></span></p></td>
<td>a 1D image, eg. histogram or lookup table
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-XYZ:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_XYZ</code></span></p></td>
<td>the first three bands are CIE XYZ
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-LAB:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_LAB</code></span></p></td>
<td>pixels are in CIE Lab space
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-CMYK:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_CMYK</code></span></p></td>
<td>the first four bands are in CMYK space
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-LABQ:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_LABQ</code></span></p></td>
<td>implies <a class="link" href="VipsImage.html#VIPS-CODING-LABQ:CAPS"><span class="type">VIPS_CODING_LABQ</span></a>
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-RGB:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_RGB</code></span></p></td>
<td>generic RGB space
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-CMC:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_CMC</code></span></p></td>
<td>a uniform colourspace based on CMC(1:1)
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-LCH:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_LCH</code></span></p></td>
<td>pixels are in CIE LCh space
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-LABS:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_LABS</code></span></p></td>
<td>CIE LAB coded as three signed 16-bit values
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-sRGB"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_sRGB</code></span></p></td>
<td>pixels are sRGB
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-YXY:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_YXY</code></span></p></td>
<td>pixels are CIE Yxy
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-FOURIER:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_FOURIER</code></span></p></td>
<td>image is in fourier space
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-RGB16:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_RGB16</code></span></p></td>
<td>generic 16-bit RGB
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-GREY16:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_GREY16</code></span></p></td>
<td>generic 16-bit mono
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-MATRIX:CAPS"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_MATRIX</code></span></p></td>
<td>a matrix
</td>
</tr>
<tr>
<td><p><a name="VIPS-INTERPRETATION-scRGB"></a><span class="term"><code class="literal">VIPS_INTERPRETATION_scRGB</code></span></p></td>
<td>pixels are scRGB
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsBandFormat"></a><h3>enum VipsBandFormat</h3>
<pre class="programlisting">typedef enum {
VIPS_FORMAT_NOTSET = -1,
VIPS_FORMAT_UCHAR = 0,
VIPS_FORMAT_CHAR = 1,
VIPS_FORMAT_USHORT = 2,
VIPS_FORMAT_SHORT = 3,
VIPS_FORMAT_UINT = 4,
VIPS_FORMAT_INT = 5,
VIPS_FORMAT_FLOAT = 6,
VIPS_FORMAT_COMPLEX = 7,
VIPS_FORMAT_DOUBLE = 8,
VIPS_FORMAT_DPCOMPLEX = 9,
VIPS_FORMAT_LAST = 10
} VipsBandFormat;
</pre>
<p>
The format used for each band element.
</p>
<p>
Each corresponnds to a native C type for the current machine. For example,
<a class="link" href="VipsImage.html#VIPS-FORMAT-USHORT:CAPS"><span class="type">VIPS_FORMAT_USHORT</span></a> is <span class="type">unsigned short</span>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-FORMAT-NOTSET:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_NOTSET</code></span></p></td>
<td>invalid setting
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-UCHAR:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_UCHAR</code></span></p></td>
<td>unsigned char format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-CHAR:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_CHAR</code></span></p></td>
<td>char format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-USHORT:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_USHORT</code></span></p></td>
<td>unsigned short format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-SHORT:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_SHORT</code></span></p></td>
<td>short format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-UINT:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_UINT</code></span></p></td>
<td>unsigned int format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-INT:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_INT</code></span></p></td>
<td>int format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-FLOAT:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_FLOAT</code></span></p></td>
<td>float format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-COMPLEX:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_COMPLEX</code></span></p></td>
<td>complex (two floats) format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-DOUBLE:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_DOUBLE</code></span></p></td>
<td>double float format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-DPCOMPLEX:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_DPCOMPLEX</code></span></p></td>
<td>double complex (two double) format
</td>
</tr>
<tr>
<td><p><a name="VIPS-FORMAT-LAST:CAPS"></a><span class="term"><code class="literal">VIPS_FORMAT_LAST</code></span></p></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsCoding"></a><h3>enum VipsCoding</h3>
<pre class="programlisting">typedef enum {
VIPS_CODING_ERROR = -1,
VIPS_CODING_NONE = 0,
VIPS_CODING_LABQ = 2,
VIPS_CODING_RAD = 6,
VIPS_CODING_LAST = 7
} VipsCoding;
</pre>
<p>
How pixels are coded.
</p>
<p>
Normally, pixels are uncoded and can be manipulated as you would expect.
However some file formats code pixels for compression, and sometimes it's
useful to be able to manipulate images in the coded format.
</p>
<p>
The gaps in the numbering are historical and must be maintained. Allocate
new numbers from the end.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-CODING-ERROR:CAPS"></a><span class="term"><code class="literal">VIPS_CODING_ERROR</code></span></p></td>
<td>
</td>
</tr>
<tr>
<td><p><a name="VIPS-CODING-NONE:CAPS"></a><span class="term"><code class="literal">VIPS_CODING_NONE</code></span></p></td>
<td>pixels are not coded
</td>
</tr>
<tr>
<td><p><a name="VIPS-CODING-LABQ:CAPS"></a><span class="term"><code class="literal">VIPS_CODING_LABQ</code></span></p></td>
<td>pixels encode 3 float CIELAB values as 4 uchar
</td>
</tr>
<tr>
<td><p><a name="VIPS-CODING-RAD:CAPS"></a><span class="term"><code class="literal">VIPS_CODING_RAD</code></span></p></td>
<td>pixels encode 3 float RGB as 4 uchar (Radiance coding)
</td>
</tr>
<tr>
<td><p><a name="VIPS-CODING-LAST:CAPS"></a><span class="term"><code class="literal">VIPS_CODING_LAST</code></span></p></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsAccess"></a><h3>enum VipsAccess</h3>
<pre class="programlisting">typedef enum {
VIPS_ACCESS_RANDOM,
VIPS_ACCESS_SEQUENTIAL,
VIPS_ACCESS_SEQUENTIAL_UNBUFFERED,
VIPS_ACCESS_LAST
} VipsAccess;
</pre>
<p>
The type of access an operation has to supply. See <a class="link" href="libvips-conversion.html#vips-tilecache" title="vips_tilecache ()"><code class="function">vips_tilecache()</code></a>
and <a class="link" href="VipsForeign.html" title="VipsForeign"><span class="type">VipsForeign</span></a>.
</p>
<p>
<em class="parameter"><code>VIPS_ACCESS_RANDOM</code></em> means requests can come in any order.
</p>
<p>
<em class="parameter"><code>VIPS_ACCESS_SEQUENTIAL</code></em> means requests will be top-to-bottom, but with some
amount of buffering behind the read point for small non-local accesses.
</p>
<p>
<em class="parameter"><code>VIPS_ACCESS_SEQUENTIAL_UNBUFFERED</code></em> means requests will be strictly
top-to-bottom with no read-behind. This can save some memory.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="VIPS-ACCESS-RANDOM:CAPS"></a><span class="term"><code class="literal">VIPS_ACCESS_RANDOM</code></span></p></td>
<td>can read anywhere
</td>
</tr>
<tr>
<td><p><a name="VIPS-ACCESS-SEQUENTIAL:CAPS"></a><span class="term"><code class="literal">VIPS_ACCESS_SEQUENTIAL</code></span></p></td>
<td>top-to-bottom reading only, but with a small buffer
</td>
</tr>
<tr>
<td><p><a name="VIPS-ACCESS-SEQUENTIAL-UNBUFFERED:CAPS"></a><span class="term"><code class="literal">VIPS_ACCESS_SEQUENTIAL_UNBUFFERED</code></span></p></td>
<td>top-to-bottom reading only
</td>
</tr>
<tr>
<td><p><a name="VIPS-ACCESS-LAST:CAPS"></a><span class="term"><code class="literal">VIPS_ACCESS_LAST</code></span></p></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsProgress"></a><h3>VipsProgress</h3>
<pre class="programlisting">typedef struct {
int run; /* Time we have been running */
int eta; /* Estimated seconds of computation left */
gint64 tpels; /* Number of pels we expect to calculate */
gint64 npels; /* Number of pels calculated so far */
int percent; /* Percent complete */
GTimer *start; /* Start time */
} VipsProgress;
</pre>
<p>
A structure available to eval callbacks giving information on evaluation
progress. See <a class="link" href="VipsImage.html#VipsImage-eval" title='The "eval" signal'><span class="type">"eval"</span></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"><span class="type">int</span> <em class="structfield"><code><a name="VipsProgress.run"></a>run</code></em>;</span></p></td>
<td>Time we have been running</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsProgress.eta"></a>eta</code></em>;</span></p></td>
<td>Estimated seconds of computation left</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">gint64</span> <em class="structfield"><code><a name="VipsProgress.tpels"></a>tpels</code></em>;</span></p></td>
<td>Number of pels we expect to calculate</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">gint64</span> <em class="structfield"><code><a name="VipsProgress.npels"></a>npels</code></em>;</span></p></td>
<td>Number of pels calculated so far</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsProgress.percent"></a>percent</code></em>;</span></p></td>
<td>Percent complete</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">GTimer</span> *<em class="structfield"><code><a name="VipsProgress.start"></a>start</code></em>;</span></p></td>
<td>Start time</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage-struct"></a><h3>VipsImage</h3>
<pre class="programlisting">typedef struct _VipsImage VipsImage;</pre>
<p>
An image. These can represent an image on disc, a memory buffer, an image
in the process of being written to disc or a partially evaluated image
in memory.
</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImageClass"></a><h3>VipsImageClass</h3>
<pre class="programlisting">typedef struct {
VipsObjectClass parent_class;
/* Signals we emit.
*/
/* Evaluation is starting.
*/
void (*preeval)( VipsImage *image, VipsProgress *progress );
/* Evaluation progress.
*/
void (*eval)( VipsImage *image, VipsProgress *progress );
/* Evaluation is ending.
*/
void (*posteval)( VipsImage *image, VipsProgress *progress );
/* An image has been written to.
* Used by eg. vips_image_new_mode("x.jpg", "w") to do the
* final write to jpeg.
* Set *result to non-zero to indicate an error on write.
*/
void (*written)( VipsImage *image, int *result );
/* An image has been modified in some way and all caches
* need dropping.
*/
void (*invalidate)( VipsImage *image );
/* Minimise this pipeline.
*
* This is triggered (sometimes) at the end of eval to signal that
* we're probably done and that operations involved should try to
* minimise memory use by, for example, dropping caches.
*
* See vips_tilecache().
*/
void (*minimise)( VipsImage *image );
} VipsImageClass;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-SIZEOF-ELEMENT:CAPS"></a><h3>VIPS_IMAGE_SIZEOF_ELEMENT()</h3>
<pre class="programlisting">#define VIPS_IMAGE_SIZEOF_ELEMENT( I )</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>I</code></em> :</span></p></td>
<td>a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="function">sizeof()</code> a band element.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-SIZEOF-PEL:CAPS"></a><h3>VIPS_IMAGE_SIZEOF_PEL()</h3>
<pre class="programlisting">#define VIPS_IMAGE_SIZEOF_PEL( I )</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>I</code></em> :</span></p></td>
<td>a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="function">sizeof()</code> a pixel.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-SIZEOF-LINE:CAPS"></a><h3>VIPS_IMAGE_SIZEOF_LINE()</h3>
<pre class="programlisting">#define VIPS_IMAGE_SIZEOF_LINE( I )</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>I</code></em> :</span></p></td>
<td>a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="function">sizeof()</code> a scanline of pixels.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-N-ELEMENTS:CAPS"></a><h3>VIPS_IMAGE_N_ELEMENTS()</h3>
<pre class="programlisting">#define VIPS_IMAGE_N_ELEMENTS( I )</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>I</code></em> :</span></p></td>
<td>a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of band elements in a scanline.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-N-PELS:CAPS"></a><h3>VIPS_IMAGE_N_PELS()</h3>
<pre class="programlisting">#define VIPS_IMAGE_N_PELS( I )</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>I</code></em> :</span></p></td>
<td>a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of pels in an image. A 64-bit unsigned int.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-ADDR:CAPS"></a><h3>VIPS_IMAGE_ADDR()</h3>
<pre class="programlisting">#define VIPS_IMAGE_ADDR( I, X, Y )</pre>
<p>
This macro returns a pointer to a pixel in an image, cast to a <span class="type">VipsPel</span> *.
It only works for
images which are fully available in memory, so memory buffers and small
mapped images only.
</p>
<p>
If VIPS_DEBUG is defined, you get a version that checks bounds for you.
</p>
<p>
See also: <a class="link" href="VipsRegion.html#VIPS-REGION-ADDR:CAPS" title="VIPS_REGION_ADDR()"><code class="function">VIPS_REGION_ADDR()</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>I</code></em> :</span></p></td>
<td>a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>X</code></em> :</span></p></td>
<td>x coordinate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Y</code></em> :</span></p></td>
<td>y coordinate</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The address of pixel (x,y) in the image.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-MATRIX:CAPS"></a><h3>VIPS_MATRIX()</h3>
<pre class="programlisting">#define VIPS_MATRIX( I, X, Y )</pre>
<p>
This macro returns a pointer to a pixel in an image, cast to a double*. The
image must have a single band, be <a class="link" href="VipsImage.html#VIPS-FORMAT-DOUBLE:CAPS"><span class="type">VIPS_FORMAT_DOUBLE</span></a> and be
fully available in memory, so memory buffers and small
mapped images only.
</p>
<p>
If VIPS_DEBUG is defined, you get a version that checks bounds and image
type for you.
</p>
<p>
See also: <a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</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>I</code></em> :</span></p></td>
<td>a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>X</code></em> :</span></p></td>
<td>x coordinate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Y</code></em> :</span></p></td>
<td>y coordinate</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The address of pixel (x,y) in the image.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-written"></a><h3>vips_image_written ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_written (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-invalidate-all"></a><h3>vips_image_invalidate_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_invalidate_all (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Invalidate all pixel caches on an <em class="parameter"><code>image</code></em> and any downstream images, that
is, images which depend on this image.
</p>
<p>
The "invalidate" callback is triggered for all invalidated images.
</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>image</code></em> :</span></p></td>
<td>
<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> to invalidate</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-minimise-all"></a><h3>vips_image_minimise_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_minimise_all (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Minimise memory use on this image and any upstream images, that is, images
which this image depends upon.
</p>
<p>
The "minimise" callback is triggered for all minimised images.
</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>image</code></em> :</span></p></td>
<td>
<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> to minimise</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-preeval"></a><h3>vips_image_preeval ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_preeval (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-eval"></a><h3>vips_image_eval ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_eval (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">guint64</span> processed</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-posteval"></a><h3>vips_image_posteval ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_posteval (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-set-progress"></a><h3>vips_image_set_progress ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_set_progress (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> progress</code></em>);</pre>
<p>
vips signals evaluation progress via the "preeval", "eval" and "posteval"
signals. Progress is signalled on the most-downstream image for which
<a class="link" href="VipsImage.html#vips-image-set-progress" title="vips_image_set_progress ()"><code class="function">vips_image_set_progress()</code></a> was called.
</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>image</code></em> :</span></p></td>
<td>image to signal progress on</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>progress</code></em> :</span></p></td>
<td>turn progress reporting on or off</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-iskilled"></a><h3>vips_image_iskilled ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_image_iskilled (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-set-kill"></a><h3>vips_image_set_kill ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_set_kill (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> kill</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new"></a><h3>vips_image_new ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
<a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a> creates a "glue" descriptor you can use to join two image
processing operations together.
</p>
<p>
It is the equivalent of vips_image_new_mode("xxx", "p").
</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>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-mode"></a><h3>vips_image_new_mode ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_mode (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mode</code></em>);</pre>
<p>
<a class="link" href="VipsImage.html#vips-image-new-mode" title="vips_image_new_mode ()"><code class="function">vips_image_new_mode()</code></a> examines the mode string and creates an
appropriate <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>.
</p>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
<span class="emphasis"><em>"t"</em></span>
creates a temporary memory buffer image.
</p></li>
<li class="listitem"><p>
<span class="emphasis"><em>"p"</em></span>
creates a "glue" descriptor you can use to join operations, see also
<a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>.
</p></li>
<li class="listitem">
<p>
<span class="emphasis"><em>"r"</em></span>
opens the named file for reading. If the file is not in the native
VIPS format for your machine, <a class="link" href="VipsImage.html#vips-image-new-mode" title="vips_image_new_mode ()"><code class="function">vips_image_new_mode()</code></a>
automatically converts the file for you.
</p>
<p>
Some formats (eg. tiled tiff) are read directly.
</p>
<p>
Some formats (eg. strip tiff) do not support random access and can't
be processed directly. Small images are decompressed to memory and
loaded from there, large images are decompressed to a disc file and
processed from that.
</p>
<p>
If the operations you intend to perform are sequential, that is, they
operate in a strict top-to-bottom manner, you can use sequential mode
instead, see "rs" below,
or you can use the lower-level
API and control the loading process yourself. See
<a class="link" href="VipsForeign.html" title="VipsForeign"><span class="type">VipsForeign</span></a>.
</p>
<p>
See <a class="link" href="VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()"><code class="function">vips_image_new_temp_file()</code></a> for an explanation of how VIPS selects a
location for the temporary file.
</p>
<p>
The disc threshold can be set with the "--vips-disc-threshold"
command-line argument, or the IM_DISC_THRESHOLD environment variable.
The value is a simple integer, but can take a unit postfix of "k",
"m" or "g" to indicate kilobytes, megabytes or gigabytes.
</p>
<p>
For example:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
vips --vips-disc-threshold 500m copy fred.tif fred.v
</pre></div>
<p>
</p>
<p>
will copy via disc if "fred.tif" is more than 500 Mbytes
uncompressed. The default threshold is 100 MB.
</p>
<p>
Note that <span class="emphasis"><em>"r"</em></span> mode works in at least two stages.
It should return quickly and let you check header fields. It will
only actually read in pixels when you first access them.
</p>
</li>
<li class="listitem"><p>
<span class="emphasis"><em>"rs"</em></span>
opens the named file for reading sequentially. It reads the source
image top-to-bottom and serves up pixels to the pipeline as required.
Provided the operations that connect to the image all demand pixels
only top-to-bottom as well, everything is fine and you avoid the
separate decompress stage.
</p></li>
<li class="listitem">
<p>
<span class="emphasis"><em>"w"</em></span>
opens the named file for writing. It looks at the file name
suffix to determine the type to write -- for example:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
vips_image_new_mode( "fred.tif", "w" )
</pre></div>
<p>
</p>
<p>
will write in TIFF format.
</p>
</li>
<li class="listitem"><p>
<span class="emphasis"><em>"rw"</em></span>
opens the named file for reading and writing. This will only work for
VIPS files in a format native to your machine. It is only for
paintbox-type applications.
</p></li>
</ul></div>
<p>
</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>filename</code></em> :</span></p></td>
<td>file to open</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>mode to open with</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-buffer"></a><h3>vips_image_new_buffer ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_buffer (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
<a class="link" href="VipsImage.html#vips-image-new-buffer" title="vips_image_new_buffer ()"><code class="function">vips_image_new_buffer()</code></a> creates a new VipsImage which when written to will
create a memory buffer. It is a convenience function for
vips_image_new_mode(<code class="function">vips_image_temp_name()</code>, "t").
</p>
<p>
See also: <a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</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"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-file"></a><h3>vips_image_new_from_file ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_from_file (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
<a class="link" href="VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()"><code class="function">vips_image_new_from_file()</code></a> opens <em class="parameter"><code>filename</code></em> for reading in mode "r". See
<a class="link" href="VipsImage.html#vips-image-new-mode" title="vips_image_new_mode ()"><code class="function">vips_image_new_mode()</code></a> for details.
</p>
<p>
See also: <a class="link" href="VipsImage.html#vips-image-new-mode" title="vips_image_new_mode ()"><code class="function">vips_image_new_mode()</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>filename</code></em> :</span></p></td>
<td>file to open</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-file-raw"></a><h3>vips_image_new_from_file_raw ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_from_file_raw (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
<em class="parameter"><code><span class="type">int</span> xsize</code></em>,
<em class="parameter"><code><span class="type">int</span> ysize</code></em>,
<em class="parameter"><code><span class="type">int</span> bands</code></em>,
<em class="parameter"><code><span class="type">guint64</span> offset</code></em>);</pre>
<p>
This function maps the named file and returns a <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> you can use to
read it.
</p>
<p>
It returns an 8-bit image with <em class="parameter"><code>bands</code></em> bands. If the image is not 8-bit, use
<code class="function">im_copy_set()</code> to transform the descriptor after loading it.
</p>
<p>
See also: <code class="function">im_copy_set()</code>, <code class="function">im_raw2vips()</code>, <a class="link" href="VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()"><code class="function">vips_image_new_from_file()</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>filename</code></em> :</span></p></td>
<td>filename to open</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>image width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image height</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bands</code></em> :</span></p></td>
<td>image bands (or bytes per pixel)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset</code></em> :</span></p></td>
<td>bytes to skip at start of file</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-memory"></a><h3>vips_image_new_from_memory ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_from_memory (<em class="parameter"><code><span class="type">void</span> *buffer</code></em>,
<em class="parameter"><code><span class="type">int</span> xsize</code></em>,
<em class="parameter"><code><span class="type">int</span> ysize</code></em>,
<em class="parameter"><code><span class="type">int</span> bands</code></em>,
<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> bandfmt</code></em>);</pre>
<p>
This function wraps an <span class="type">IMAGE</span> around a memory buffer. VIPS does not take
responsibility for the area of memory, it's up to you to make sure it's
freed when the image is closed. See for example <a class="link" href="libvips-VipsArgument.html#VipsObject-close" title='The "close" signal'><span class="type">"close"</span></a>.
</p>
<p>
See also: <code class="function">im_binfile()</code>, <code class="function">im_raw2vips()</code>, <a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</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>buffer</code></em> :</span></p></td>
<td>start of memory area</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>image width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image height</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bands</code></em> :</span></p></td>
<td>image bands (or bytes per pixel)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandfmt</code></em> :</span></p></td>
<td>image format</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-matrix"></a><h3>vips_image_new_matrix ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_matrix (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);</pre>
<p>
This convenience function makes an image which is a matrix: a one-band
VIPS_FORMAT_DOUBLE image held in memory.
</p>
<p>
Use <a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a>, or <a class="link" href="VipsImage.html#VIPS-MATRIX:CAPS" title="VIPS_MATRIX()"><code class="function">VIPS_MATRIX()</code></a> to address pixels in the image.
</p>
<p>
Use <a class="link" href="libvips-header.html#vips-image-set-double" title="vips_image_set_double ()"><code class="function">vips_image_set_double()</code></a> to set "scale" and "offset", if required.
</p>
<p>
See also: <a class="link" href="VipsImage.html#vips-image-new-matrixv" title="vips_image_new_matrixv ()"><code class="function">vips_image_new_matrixv()</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>width</code></em> :</span></p></td>
<td>image width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>image height</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-matrixv"></a><h3>vips_image_new_matrixv ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_matrixv (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
As <a class="link" href="VipsImage.html#vips-image-new-matrix" title="vips_image_new_matrix ()"><code class="function">vips_image_new_matrix()</code></a>, but initialise the matrix from the argument
list. After <em class="parameter"><code>height</code></em> should be <em class="parameter"><code>width</code></em> * <em class="parameter"><code>height</code></em> double constants which are
used to set the matrix elements.
</p>
<p>
See also: <a class="link" href="VipsImage.html#vips-image-new-matrix" title="vips_image_new_matrix ()"><code class="function">vips_image_new_matrix()</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>width</code></em> :</span></p></td>
<td>image width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>image height</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>matrix coefficients</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-set-delete-on-close"></a><h3>vips_image_set_delete_on_close ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> vips_image_set_delete_on_close (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> delete_on_close</code></em>);</pre>
<p>
Sets the delete_on_close flag for the image. If this flag is set, when
<em class="parameter"><code>image</code></em> is finalized, the filename held in <em class="parameter"><code>image->filename</code></em> at the time of
this call is unlinked.
</p>
<p>
This function is clearly extremely dangerous, use with great caution.
</p>
<p>
See also: <a class="link" href="libvips-util.html#vips--temp-name" title="vips__temp_name ()"><code class="function">vips__temp_name()</code></a>, <a class="link" href="VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()"><code class="function">vips_image_new_temp_file()</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>image</code></em> :</span></p></td>
<td>image to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>delete_on_close</code></em> :</span></p></td>
<td>format of file</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-temp-file"></a><h3>vips_image_new_temp_file ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> * vips_image_new_temp_file (<em class="parameter"><code>const <span class="type">char</span> *format</code></em>);</pre>
<p>
Make a "w" disc <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> which will be automatically unlinked when it is
destroyed. <em class="parameter"><code>format</code></em> is something like "<code class="literal">s</code>.v" for a vips file.
</p>
<p>
The file is created in the temporary directory, see <a class="link" href="libvips-util.html#vips--temp-name" title="vips__temp_name ()"><code class="function">vips__temp_name()</code></a>.
</p>
<p>
See also: <a class="link" href="libvips-util.html#vips--temp-name" title="vips__temp_name ()"><code class="function">vips__temp_name()</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>format</code></em> :</span></p></td>
<td>format of file</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a>, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write"></a><h3>vips_image_write ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_write (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Write <em class="parameter"><code>image</code></em> to <em class="parameter"><code>out</code></em>. Use <a class="link" href="VipsImage.html#vips-image-new-mode" title="vips_image_new_mode ()"><code class="function">vips_image_new_mode()</code></a> and friends to create the
<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> you want to write to.
</p>
<p>
See also: <a class="link" href="VipsImage.html#vips-image-new-mode" title="vips_image_new_mode ()"><code class="function">vips_image_new_mode()</code></a>, <a class="link" href="libvips-conversion.html#vips-copy" title="vips_copy ()"><code class="function">vips_copy()</code></a>, <a class="link" href="VipsImage.html#vips-image-write-to-file" title="vips_image_write_to_file ()"><code class="function">vips_image_write_to_file()</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>image</code></em> :</span></p></td>
<td>image to write</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>write to this image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-to-file"></a><h3>vips_image_write_to_file ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_write_to_file (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
A convenience function to write <em class="parameter"><code>image</code></em> to a file.
</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>image</code></em> :</span></p></td>
<td>image to write</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>write to this file</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-isMSBfirst"></a><h3>vips_image_isMSBfirst ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_image_isMSBfirst (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>image</code></em> is in most-significant-
byte first form. This is the byte order used on the SPARC
architecture and others.
</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>image</code></em> :</span></p></td>
<td>image to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-isfile"></a><h3>vips_image_isfile ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_image_isfile (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>image</code></em> represents a file on disc in some way.
</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>image</code></em> :</span></p></td>
<td>image to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-ispartial"></a><h3>vips_image_ispartial ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_image_ispartial (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>im</code></em> represents a partial image (a delayed calculation).
</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>image</code></em> :</span></p></td>
<td>image to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-wio-input"></a><h3>vips_image_wio_input ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_wio_input (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Check that an image is readable via the <a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a> macro, that is,
that the entire image is in memory and all pixels can be read with
<a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a>.
</p>
<p>
If it
isn't, try to transform it so that <a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a> can work.
</p>
<p>
See also: <code class="function">vips_image_wio_output()</code>, <a class="link" href="VipsImage.html#vips-image-pio-input" title="vips_image_pio_input ()"><code class="function">vips_image_pio_input()</code></a>,
<a class="link" href="VipsImage.html#vips-image-inplace" title="vips_image_inplace ()"><code class="function">vips_image_inplace()</code></a>, <a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</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>image</code></em> :</span></p></td>
<td>image to transform</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on succeess, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-pio-input"></a><h3>vips_image_pio_input ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_pio_input (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Check that an image is readable with <a class="link" href="VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a> and friends.
If it isn't, try to transform the image so that <a class="link" href="VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a> can
work.
</p>
<p>
See also: <code class="function">vips_image_pio_output()</code>, <a class="link" href="VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</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>image</code></em> :</span></p></td>
<td>image to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on succeess, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-inplace"></a><h3>vips_image_inplace ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_inplace (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Gets <em class="parameter"><code>image</code></em> ready for an in-place operation, such as <code class="function">im_insertplace()</code>.
After calling this function you can both read and write the image with
<a class="link" href="VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a>.
</p>
<p>
See also: <code class="function">im_insertplace()</code>, <a class="link" href="VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</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>image</code></em> :</span></p></td>
<td>image to make read-write</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on succeess, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-prepare"></a><h3>vips_image_write_prepare ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_write_prepare (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>);</pre>
<p>
Call this after setting header fields (width, height, and so on) to
allocate resources ready for writing.
</p>
<p>
Normally this function is called for you by <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a> or
<a class="link" href="VipsImage.html#vips-image-write-line" title="vips_image_write_line ()"><code class="function">vips_image_write_line()</code></a>. You will need to call it yourself if you plan to
write directly to the ->data member of a "t" 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>image</code></em> :</span></p></td>
<td>image to prepare</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-line"></a><h3>vips_image_write_line ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_image_write_line (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
<em class="parameter"><code><span class="type">int</span> ypos</code></em>,
<em class="parameter"><code><span class="type">VipsPel</span> *linebuffer</code></em>);</pre>
<p>
Write a line of pixels to an image. This function must be called repeatedly
with <em class="parameter"><code>ypos</code></em> increasing from 0 to <em class="parameter"><code>YSize</code></em> -
<em class="parameter"><code>linebuffer</code></em> must be <a class="link" href="VipsImage.html#VIPS-IMAGE-SIZEOF-LINE:CAPS" title="VIPS_IMAGE_SIZEOF_LINE()"><code class="function">VIPS_IMAGE_SIZEOF_LINE()</code></a> bytes long.
</p>
<p>
See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</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>image</code></em> :</span></p></td>
<td>image to write to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ypos</code></em> :</span></p></td>
<td>vertical position of scan-line to write</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>linebuffer</code></em> :</span></p></td>
<td>scanline of pixels</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-isint"></a><h3>vips_band_format_isint ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_band_format_isint (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em> is one of the integer types.
</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>format</code></em> :</span></p></td>
<td>format to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-isuint"></a><h3>vips_band_format_isuint ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_band_format_isuint (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em> is one of the unsigned integer types.
</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>format</code></em> :</span></p></td>
<td>format to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-is8bit"></a><h3>vips_band_format_is8bit ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_band_format_is8bit (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em> is uchar or schar.
</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>format</code></em> :</span></p></td>
<td>format to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-isfloat"></a><h3>vips_band_format_isfloat ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_band_format_isfloat (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em> is one of the float types.
</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>format</code></em> :</span></p></td>
<td>format to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-iscomplex"></a><h3>vips_band_format_iscomplex ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> vips_band_format_iscomplex (<em class="parameter"><code><a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>
Return <code class="literal">TRUE</code> if <em class="parameter"><code>fmt</code></em> is one of the complex types.
</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>format</code></em> :</span></p></td>
<td>format to test</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-system"></a><h3>vips_system ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> vips_system (<em class="parameter"><code>const <span class="type">char</span> *cmd_format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Optional arguments:
</p>
<p>
<em class="parameter"><code>in</code></em>: input image
<em class="parameter"><code>out</code></em>: output image
<em class="parameter"><code>in_format</code></em>: write input file like this
<em class="parameter"><code>out_format</code></em>: write output filename like this
<em class="parameter"><code>log</code></em>: stdout of command is returned here
</p>
<p>
<a class="link" href="VipsImage.html#vips-system" title="vips_system ()"><code class="function">vips_system()</code></a> runs a command, optionally passing an image in and
optionally getting an image
back. The command's stdout is returned in <em class="parameter"><code>log</code></em>.
</p>
<p>
First, if <em class="parameter"><code>in</code></em> is set, it is written to a file. The filename is formed by
substituting something like "vips-49857-1" for the first %<code class="literal">s</code> in <em class="parameter"><code>in_format</code></em>,
then
prepending "/tmp". If the environment variable TMPDIR is defined, it
can be used to set a different temporary directory.
</p>
<p>
On Windows, if the environment variable TMPDIR is not defined, VIPS calls
<code class="function">GetTempPath()</code> to get the user's preferred temporary area. If that fails, it
defaults to C:\temp.
</p>
<p>
If <em class="parameter"><code>in_format</code></em> is
something like "%<code class="literal">s</code>.png", the file will be written in PNG format. By
default, <em class="parameter"><code>in_format</code></em> is "%<code class="literal">s</code>.tif".
</p>
<p>
If <em class="parameter"><code>out_format</code></em> is set, an output filename is formed in the same way.
</p>
<p>
The
command string to run is made by substituting the first %<code class="literal">s</code> in <em class="parameter"><code>cmd_format</code></em>
for the name of the input file, if <em class="parameter"><code>in</code></em> is set, and the second %<code class="literal">s</code> for the
output filename, if set.
</p>
<p>
The command is executed with <code class="function">popen()</code> and the output captured in <em class="parameter"><code>log</code></em>.
</p>
<p>
After the command finishes, if <em class="parameter"><code>out_format</code></em> is set, the output image is
opened and returned in <em class="parameter"><code>out</code></em>.
Closing the output image will automatically delete the output file.
</p>
<p>
Finally the input images are deleted.
</p>
<p>
For example, this call will run the ImageMagick convert program on an
image, using JPEG files to pass images into and out of the convert command.
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
VipsImage *in;
VipsImage *out;
char *log;
if (vips_system ("convert %s -swirl 45 %s",
"in", in,
"out", &out,
"in_format", "%s.jpg",
"out_format", "%s.jpg",
"log", &log,
NULL))
error ...
</pre></div>
<p>
</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>cmd_format</code></em> :</span></p></td>
<td>command to run</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>
<code class="literal">NULL</code>-terminated list of optional named arguments</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on failure.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="VipsImage.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="VipsImage--bands"></a><h3>The <code class="literal">"bands"</code> property</h3>
<pre class="programlisting"> "bands" <span class="type">gint</span> : Read / Write</pre>
<p>Number of bands in image.</p>
<p>Allowed values: [1,1000000000]</p>
<p>Default value: 1</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--coding"></a><h3>The <code class="literal">"coding"</code> property</h3>
<pre class="programlisting"> "coding" <a class="link" href="VipsImage.html#VipsCoding" title="enum VipsCoding"><span class="type">VipsCoding</span></a> : Read / Write</pre>
<p>Pixel coding.</p>
<p>Default value: VIPS_CODING_NONE</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--demand"></a><h3>The <code class="literal">"demand"</code> property</h3>
<pre class="programlisting"> "demand" <a class="link" href="VipsImage.html#VipsDemandStyle" title="enum VipsDemandStyle"><span class="type">VipsDemandStyle</span></a> : Read / Write</pre>
<p>Preferred demand style for this image.</p>
<p>Default value: VIPS_DEMAND_STYLE_SMALLTILE</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--filename"></a><h3>The <code class="literal">"filename"</code> property</h3>
<pre class="programlisting"> "filename" <span class="type">gchar</span>* : Read / Write</pre>
<p>Image filename.</p>
<p>Default value: NULL</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--foreign-buffer"></a><h3>The <code class="literal">"foreign-buffer"</code> property</h3>
<pre class="programlisting"> "foreign-buffer" <span class="type">gpointer</span> : Read / Write</pre>
<p>Pointer to foreign pixels.</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--format"></a><h3>The <code class="literal">"format"</code> property</h3>
<pre class="programlisting"> "format" <a class="link" href="VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> : Read / Write</pre>
<p>Pixel format in image.</p>
<p>Default value: VIPS_FORMAT_UCHAR</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--height"></a><h3>The <code class="literal">"height"</code> property</h3>
<pre class="programlisting"> "height" <span class="type">gint</span> : Read / Write</pre>
<p>Image height in pixels.</p>
<p>Allowed values: [1,1000000000]</p>
<p>Default value: 1</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--interpretation"></a><h3>The <code class="literal">"interpretation"</code> property</h3>
<pre class="programlisting"> "interpretation" <a class="link" href="VipsImage.html#VipsInterpretation" title="enum VipsInterpretation"><span class="type">VipsInterpretation</span></a> : Read / Write</pre>
<p>Pixel interpretation.</p>
<p>Default value: VIPS_INTERPRETATION_MULTIBAND</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--kill"></a><h3>The <code class="literal">"kill"</code> property</h3>
<pre class="programlisting"> "kill" <span class="type">gboolean</span> : Read / Write</pre>
<p>Block evaluation on this image.</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--mode"></a><h3>The <code class="literal">"mode"</code> property</h3>
<pre class="programlisting"> "mode" <span class="type">gchar</span>* : Read / Write</pre>
<p>Open mode.</p>
<p>Default value: "p"</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--sizeof-header"></a><h3>The <code class="literal">"sizeof-header"</code> property</h3>
<pre class="programlisting"> "sizeof-header" <span class="type">guint64</span> : Read / Write</pre>
<p>Offset in bytes from start of file.</p>
<p>Allowed values: <= 1000000</p>
<p>Default value: 64</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--width"></a><h3>The <code class="literal">"width"</code> property</h3>
<pre class="programlisting"> "width" <span class="type">gint</span> : Read / Write</pre>
<p>Image width in pixels.</p>
<p>Allowed values: [1,1000000000]</p>
<p>Default value: 1</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--xoffset"></a><h3>The <code class="literal">"xoffset"</code> property</h3>
<pre class="programlisting"> "xoffset" <span class="type">gint</span> : Read / Write</pre>
<p>Horizontal offset of origin.</p>
<p>Allowed values: [-1000000,1000000]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--xres"></a><h3>The <code class="literal">"xres"</code> property</h3>
<pre class="programlisting"> "xres" <span class="type">gdouble</span> : Read / Write</pre>
<p>Horizontal resolution in pixels/mm.</p>
<p>Allowed values: [-0,1e+06]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--yoffset"></a><h3>The <code class="literal">"yoffset"</code> property</h3>
<pre class="programlisting"> "yoffset" <span class="type">gint</span> : Read / Write</pre>
<p>Vertical offset of origin.</p>
<p>Allowed values: [-1000000,1000000]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage--yres"></a><h3>The <code class="literal">"yres"</code> property</h3>
<pre class="programlisting"> "yres" <span class="type">gdouble</span> : Read / Write</pre>
<p>Vertical resolution in pixels/mm.</p>
<p>Allowed values: [-0,1e+06]</p>
<p>Default value: 0</p>
</div>
</div>
<div class="refsect1">
<a name="VipsImage.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="VipsImage-eval"></a><h3>The <code class="literal">"eval"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vipsimage,
<span class="type">gpointer</span> arg1,
<span class="type">gpointer</span> user_data) : <code class="literal">Run Last</code></pre>
<p>
</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>vipsimage</code></em> :</span></p></td>
<td>the object which received the signal.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage-invalidate"></a><h3>The <code class="literal">"invalidate"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vipsimage,
<span class="type">gpointer</span> user_data) : <code class="literal">Action</code></pre>
<p>
</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>vipsimage</code></em> :</span></p></td>
<td>the object which received the signal.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage-minimise"></a><h3>The <code class="literal">"minimise"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vipsimage,
<span class="type">gpointer</span> user_data) : <code class="literal">Action</code></pre>
<p>
</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>vipsimage</code></em> :</span></p></td>
<td>the object which received the signal.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage-posteval"></a><h3>The <code class="literal">"posteval"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vipsimage,
<span class="type">gpointer</span> arg1,
<span class="type">gpointer</span> user_data) : <code class="literal">Run Last</code></pre>
<p>
</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>vipsimage</code></em> :</span></p></td>
<td>the object which received the signal.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage-preeval"></a><h3>The <code class="literal">"preeval"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vipsimage,
<span class="type">gpointer</span> arg1,
<span class="type">gpointer</span> user_data) : <code class="literal">Run Last</code></pre>
<p>
</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>vipsimage</code></em> :</span></p></td>
<td>the object which received the signal.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImage-written"></a><h3>The <code class="literal">"written"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vipsimage,
<span class="type">gpointer</span> arg1,
<span class="type">gpointer</span> user_data) : <code class="literal">Action</code></pre>
<p>
</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>vipsimage</code></em> :</span></p></td>
<td>the object which received the signal.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="VipsImage.see-also"></a><h2>See Also</h2>
region
</div>
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