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<title>color - Count the Colors in an Image</title>
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<P><a name="__index__"></a></P>
<!-- INDEX BEGIN -->
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#function_descriptions">FUNCTION DESCRIPTIONS</a></li>
<ul>
<li><a href="#getcolorinfolist">GetColorInfoList</a></li>
<li><a href="#getcolorlist">GetColorList</a></li>
<li><a href="#getimagehistogram">GetImageHistogram</a></li>
<li><a href="#getmagickpixelpacket">GetMagickPixelPacket</a></li>
<li><a href="#getnumbercolors">GetNumberColors</a></li>
<li><a href="#isgrayimage">IsGrayImage</a></li>
<li><a href="#ismonochromeimage">IsMonochromeImage</a></li>
<li><a href="#isopaqueimage">IsOpaqueImage</a></li>
<li><a href="#ispaletteimage">IsPaletteImage</a></li>
<li><a href="#listcolorinfo">ListColorInfo</a></li>
<li><a href="#loadcolorlists">LoadColorLists</a></li>
<li><a href="#querycolordatabase">QueryColorDatabase</a></li>
<li><a href="#querycolorname">QueryColorname</a></li>
<li><a href="#querymagickcolor">QueryMagickColor</a></li>
</ul>
</ul>
<!-- INDEX END -->
<hr />
<P>
</P>
<h1><a name="name">NAME</a></h1>
<P>color - Count the Colors in an Image</P>
<P>
</P>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<P>const ColorInfo ** <strong>GetColorInfoList</strong>( const char *pattern, unsigned long *number_colors );</P>
<P>char ** <strong>GetColorList</strong>( const char *pattern, unsigned long *number_colors );</P>
<P>unsigned long <strong>GetImageHistogram</strong>( const Image *image, unsigned long *number_colors, ExceptionInfo *exception );</P>
<P><strong>GetMagickPixelPacket</strong>( const Image *image, MagickPixelPacket *pixel );</P>
<P>unsigned long <strong>GetNumberColors</strong>( const Image *image, FILE *file, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>IsGrayImage</strong>( const Image *image, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>IsMonochromeImage</strong>( const Image *image, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>IsOpaqueImage</strong>( const Image *image, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>IsPaletteImage</strong>( const Image *image, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>ListColorInfo</strong>( FILE *file, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>LoadColorLists</strong>( const char *filename, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>QueryColorDatabase</strong>( const char *name, PixelPacket *color, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>QueryColorname</strong>( const Image *image, const PixelPacket *color, const ComplianceType compliance, char *name, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>QueryMagickColor</strong>( const char *name, MagickPixelPacket *color, ExceptionInfo *exception );</P>
<P>
</P>
<hr />
<h1><a name="function_descriptions">FUNCTION DESCRIPTIONS</a></h1>
<P>
</P>
<h2><a name="getcolorinfolist">GetColorInfoList</a></h2>
<blockquote>GetColorInfoList() returns any colors that match the specified pattern. </blockquote><P>The format of the GetColorInfoList function is:</P>
<blockquote>const ColorInfo **GetColorInfoList ( const char *pattern, unsigned long *number_colors ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_pattern_3a">pattern:</a></strong><br />
</dt>
<DD>
Specifies a pointer to a text string containing a pattern.
</dd>
<P></P>
<dt><strong><a name="item_o_number_colors_3a">number_colors:</a></strong><br />
</dt>
<DD>
This integer returns the number of colors in the list.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getcolorlist">GetColorList</a></h2>
<blockquote>GetColorList() returns any colors that match the specified pattern. </blockquote><P>The format of the GetColorList function is:</P>
<blockquote>char **GetColorList ( const char *pattern, unsigned long *number_colors ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>pattern:</strong><br />
</dt>
<DD>
Specifies a pointer to a text string containing a pattern.
</dd>
<P></P>
<dt><strong>number_colors:</strong><br />
</dt>
<DD>
This integer returns the number of colors in the list.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getimagehistogram">GetImageHistogram</a></h2>
<blockquote>GetImageHistogram() returns the unique colors in an image. </blockquote><P>The format of the GetImageHistogram method is:</P>
<blockquote>unsigned long GetImageHistogram ( const <A HREF="types.html#Image">Image</A> *image, unsigned long *number_colors, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows.</P>
<dl>
<dt><strong><a name="item_o_image_3a">image:</a></strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong><a name="item_o_file_3a">file:</a></strong><br />
</dt>
<DD>
Write a histogram of the color distribution to this file handle.
</dd>
<P></P>
<dt><strong><a name="item_o_exception_3a">exception:</a></strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getmagickpixelpacket">GetMagickPixelPacket</a></h2>
<blockquote>GetMagickPixelPacket() initializes the MagickPixelPacket structure. </blockquote><P>The format of the GetMagickPixelPacket method is:</P>
<blockquote>GetMagickPixelPacket ( const <A HREF="types.html#Image">Image</A> *image, MagickPixelPacket *pixel ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong><a name="item_o_pixel_3a">pixel:</a></strong><br />
</dt>
<DD>
Specifies a pointer to a PixelPacket structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="getnumbercolors">GetNumberColors</a></h2>
<blockquote>GetNumberColors() returns the number of unique colors in an image. </blockquote><P>The format of the GetNumberColors method is:</P>
<blockquote>unsigned long GetNumberColors ( const <A HREF="types.html#Image">Image</A> *image, FILE *file, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows.</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>file:</strong><br />
</dt>
<DD>
Write a histogram of the color distribution to this file handle.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="isgrayimage">IsGrayImage</a></h2>
<blockquote>IsGrayImage() returns MagickTrue if all the pixels in the image have the same red, green, and blue intensities. </blockquote><P>The format of the IsGrayImage method is:</P>
<blockquote>MagickBooleanType IsGrayImage ( const <A HREF="types.html#Image">Image</A> *image, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="ismonochromeimage">IsMonochromeImage</a></h2>
<blockquote>IsMonochromeImage() returns MagickTrue if all the pixels in the image have the same red, green, and blue intensities and the intensity is either 0 or MaxRGB. </blockquote><P>The format of the IsMonochromeImage method is:</P>
<blockquote>MagickBooleanType IsMonochromeImage ( const <A HREF="types.html#Image">Image</A> *image, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="isopaqueimage">IsOpaqueImage</a></h2>
<blockquote>IsOpaqueImage() returns MagickTrue if none of the pixels in the image have an opacity value other than opaque ( 0 ) . </blockquote><P>The format of the IsOpaqueImage method is:</P>
<blockquote>MagickBooleanType IsOpaqueImage ( const <A HREF="types.html#Image">Image</A> *image, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="ispaletteimage">IsPaletteImage</a></h2>
<blockquote>IsPaletteImage() returns MagickTrue if the image is PseudoClass and has 256 unique colors or less. </blockquote><P>The format of the IsPaletteImage method is:</P>
<blockquote>MagickBooleanType IsPaletteImage ( const <A HREF="types.html#Image">Image</A> *image, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows.</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="listcolorinfo">ListColorInfo</a></h2>
<blockquote>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. </blockquote><P>The format of the ListColorInfo method is:</P>
<blockquote>MagickBooleanType ListColorInfo ( FILE *file, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows.</P>
<dl>
<dt><strong>file:</strong><br />
</dt>
<DD>
List color names to this file handle.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="loadcolorlists">LoadColorLists</a></h2>
<P><code>LoadColorList()</code> loads one or more color configuration file which provides a mapping between color attributes and a color name.</P>
<P>The format of the LoadColorLists method is:</P>
<blockquote>MagickBooleanType LoadColorLists ( const char *filename, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_filename_3a">filename:</a></strong><br />
</dt>
<DD>
The font file name.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="querycolordatabase">QueryColorDatabase</a></h2>
<blockquote>QueryColorDatabase() returns the red, green, blue, and opacity intensities for a given color name. </blockquote><P>The format of the QueryColorDatabase method is:</P>
<blockquote>MagickBooleanType QueryColorDatabase ( const char *name, <A HREF="types.html#PixelPacket">PixelPacket</A> *color, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_name_3a">name:</a></strong><br />
</dt>
<DD>
The color name (e.g. white, blue, yellow).
</dd>
<P></P>
<dt><strong><a name="item_o_color_3a">color:</a></strong><br />
</dt>
<DD>
The red, green, blue, and opacity intensities values of the named color in this structure.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="querycolorname">QueryColorname</a></h2>
<blockquote>QueryColorname() returns a named color for the given color intensity. If an exact match is not found, a hex value is return instead. For example an intensity of rgb: ( 0, 0, 0 ) returns black whereas rgb: ( 223, 223, 223 ) returns #dfdfdf. </blockquote><P>The format of the QueryColorname method is:</P>
<blockquote>MagickBooleanType QueryColorname ( const <A HREF="types.html#Image">Image</A> *image, const <A HREF="types.html#PixelPacket">PixelPacket</A> *color, const <A HREF="types.html#ComplianceType">ComplianceType</A> compliance, char *name, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows.</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>color:</strong><br />
</dt>
<DD>
The color intensities.
</dd>
<P></P>
<dt><strong><a name="item_o_compliance_3a">Compliance:</a></strong><br />
</dt>
<DD>
Adhere to this color standard: SVG, X11, or XPM.
</dd>
<P></P>
<dt><strong>name:</strong><br />
</dt>
<DD>
Return the color name or hex value.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="querymagickcolor">QueryMagickColor</a></h2>
<blockquote>QueryMagickColor() returns the red, green, blue, and opacity intensities for a given color name. </blockquote><P>The format of the QueryMagickColor method is:</P>
<blockquote>MagickBooleanType QueryMagickColor ( const char *name, MagickPixelPacket *color, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>name:</strong><br />
</dt>
<DD>
The color name (e.g. white, blue, yellow).
</dd>
<P></P>
<dt><strong>color:</strong><br />
</dt>
<DD>
The red, green, blue, and opacity intensities values of the named color in this structure.
</dd>
<P></P>
<dt><strong>exception:</strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
</dl>
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