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<a class="headsubtitle" href="munipack.html">A general astronomical image processing software</a>
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<h1>Color-space Transformations</h1>
<p class="abstract">
Color-space transformations
</p>
<h2>Command</h2>
<pre>
munipack ctrafo [-o file] [-c colorspace] [-ct cstable] file black1,weight1 ...
munipack ctrafo [--list]
</pre>
<h2>Description</h2>
<p>
Transform a color FITS file (specified as the first non-optional parameter)
to a new colorspace given by -c option.
</p>
<p>
The --list option lists all possible known spaces.
</p>
<p>
With -ct you can specify a file with addtional transformations.
The format of the file is described in sources.
</p>
<p>
The mandatory parameter
is black (weight is optional) for every band in the input FITS. But, ones are
currently used only for the transformation to CIE 1931 XYZ colorspace.
Both must be determined
empirically. It is recommended for black to use level 1-sigma under
median for typical night sky images. The weight is proportional
to the recorded flux, so choose weight by the reciprocal relative ratio
of exposure times.
</p>
<h2>Parameters</h2>
<dl>
<dt><samp>-c color-space</samp></dt><dd>Color-space of the output image</dd>
<dt><samp>-ct color-space table</samp></dt><dd> Table of known color-spaces</dd>
<dt><samp>--list</samp></dt><dd> List of predefined color-spaces</dd>
</dl>
<p>See <a href="man_com.html">Common options</a> for input/output filenames.</p>
<h2>Examples</h2>
<p>Convert a color FITS image to a new colorspace. The black levels are
10 thousand (in B), 24 thousand (V) and 52 thousand (in R).
The blue filter we get with 0.66 weight:
</p>
<code>
$ munipack ctrafo -o m27_xyz.fits -c 'XYZ' m27.fits 1e4,0.66 24e3,1 52e3,1
</code>
<figure>
<img class="figure" src="color-best.png" alt="color_best.png" title="M27 in Colors">
<figcaption>
Dumbell nebula in colors
</figcaption>
</figure>
<h2>See Also</h2>
<p><a href="colorspace.html">Color Processing</a>,
<a href="man_com.html">Common options</a></p>
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Filip Hroch (<a style="text-decoration: none" href="mailto:hroch@physics.muni.cz?Subject=Munipack" title="Author's Email">✉</a>), license <a href="http://www.gnu.org/licenses/gpl.html">GPLv3</a>.
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