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<title>ImageMagick - MagickCore, C API: Count the Colors in an Image</title>
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<p class="text-center"><a href="color.html#AcquireColorCache">AcquireColorCache</a> • <a href="color.html#GetColorInfoList">GetColorInfoList</a> • <a href="color.html#GetColorList">GetColorList</a> • <a href="color.html#ListColorInfo">ListColorInfo</a> • <a href="color.html#QueryColorname">QueryColorname</a></p>
<h2><a href="../../api/MagickCore/color_8c.html" id="AcquireColorCache">AcquireColorCache</a></h2>
<p>AcquireColorCache() caches one or more color configurations which provides a mapping between color attributes and a color name.</p>
<p>The format of the AcquireColorCache method is:</p>
<pre class="text">
LinkedListInfo *AcquireColorCache(const char *filename,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>filename</dt>
<dd>the font file name. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/color_8c.html" id="GetColorInfoList">GetColorInfoList</a></h2>
<p>GetColorInfoList() returns any colors that match the specified pattern.</p>
<p>The format of the GetColorInfoList function is:</p>
<pre class="text">
const ColorInfo **GetColorInfoList(const char *pattern,
size_t *number_colors,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>pattern</dt>
<dd>Specifies a pointer to a text string containing a pattern. </dd>
<dd> </dd>
<dt>number_colors</dt>
<dd> This integer returns the number of colors in the list. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/color_8c.html" id="GetColorList">GetColorList</a></h2>
<p>GetColorList() returns any colors that match the specified pattern.</p>
<p>The format of the GetColorList function is:</p>
<pre class="text">
char **GetColorList(const char *pattern,size_t *number_colors,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>pattern</dt>
<dd>Specifies a pointer to a text string containing a pattern. </dd>
<dd> </dd>
<dt>number_colors</dt>
<dd> This integer returns the number of colors in the list. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/color_8c.html" id="ListColorInfo">ListColorInfo</a></h2>
<p>ListColorInfo() lists color names to the specified file. Color names are a convenience. Rather than defining a color by its red, green, and blue intensities just use a color name such as white, blue, or yellow.</p>
<p>The format of the ListColorInfo method is:</p>
<pre class="text">
MagickBooleanType ListColorInfo(FILE *file,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows.</p>
<dt>file</dt>
<p>List color names to this file handle.</p>
<dt>exception</dt>
<p>return any errors or warnings in this structure.</p>
<h2><a href="../../api/MagickCore/color_8c.html" id="QueryColorname">QueryColorname</a></h2>
<p>QueryColorname() returns a named color for the given color intensity. If an exact match is not found, a hex value is returned instead. For example an intensity of rgb:(0,0,0) returns black whereas rgb:(223,223,223) returns #dfdfdf.</p>
<p>UPDATE: the 'image' argument is no longer needed as all information should have been preset using GetPixelInfo().</p>
<p>The format of the QueryColorname method is:</p>
<pre class="text">
MagickBooleanType QueryColorname(const Image *image,
const PixelInfo *color,const ComplianceType compliance,char *name,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows.</p>
<dt>image</dt>
<p>the image. (not used! - color gets settings from GetPixelInfo()</p>
<dt>color</dt>
<p>the color intensities.</p>
<dt>Compliance</dt>
<p>Adhere to this color standard: SVG, X11, or XPM.</p>
<dt>name</dt>
<p>Return the color name or hex value.</p>
<dt>exception</dt>
<p>return any errors or warnings in this structure.</p>
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