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cristy29f2c972015-07-28 13:37:46 +0000[diff] [blame]9 <title>ImageMagick: MagickCore, C API for ImageMagick: Count the Colors in an Image</title>
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51 </div>
52</div>
53<div class="container">
cristy4e638cd2015-05-07 16:47:40 +0000[diff] [blame]54<div class="magick-header">
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]55<p class="text-center"><a href="color.html#AcquireColorCache">AcquireColorCache</a> &#8226; <a href="color.html#GetColorInfoList">GetColorInfoList</a> &#8226; <a href="color.html#GetColorList">GetColorList</a> &#8226; <a href="color.html#ListColorInfo">ListColorInfo</a> &#8226; <a href="color.html#QueryColorname">QueryColorname</a></p>
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame]56
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]57<h2><a href="http://www.imagemagick.org/api/MagickCore/color_8c.html" id="AcquireColorCache">AcquireColorCache</a></h2>
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame]58
59<p>AcquireColorCache() caches one or more color configurations which provides a mapping between color attributes and a color name.</p>
60
61<p>The format of the AcquireColorCache method is:</p>
62
63<pre class="text">
64LinkedListInfo *AcquireColorCache(const char *filename,
65 ExceptionInfo *exception)
66</pre>
67
68<p>A description of each parameter follows:</p>
69
70<dd>
71</dd>
72
73<dd> </dd>
74<dl class="dl-horizontal">
75<dt>filename</dt>
76<dd>the font file name. </dd>
77
78<dd> </dd>
79<dt>exception</dt>
80<dd>return any errors or warnings in this structure. </dd>
81
82<dd> </dd>
83</dl>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]84<h2><a href="http://www.imagemagick.org/api/MagickCore/color_8c.html" id="GetColorInfoList">GetColorInfoList</a></h2>
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame]85
86<p>GetColorInfoList() returns any colors that match the specified pattern.</p>
87
88<p>The format of the GetColorInfoList function is:</p>
89
90<pre class="text">
91const ColorInfo **GetColorInfoList(const char *pattern,
92 size_t *number_colors,ExceptionInfo *exception)
93</pre>
94
95<p>A description of each parameter follows:</p>
96
97<dd>
98</dd>
99
100<dd> </dd>
101<dl class="dl-horizontal">
102<dt>pattern</dt>
103<dd>Specifies a pointer to a text string containing a pattern. </dd>
104
105<dd> </dd>
106<dt>number_colors</dt>
107<dd> This integer returns the number of colors in the list. </dd>
108
109<dd> </dd>
110<dt>exception</dt>
111<dd>return any errors or warnings in this structure. </dd>
112
113<dd> </dd>
114</dl>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]115<h2><a href="http://www.imagemagick.org/api/MagickCore/color_8c.html" id="GetColorList">GetColorList</a></h2>
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame]116
117<p>GetColorList() returns any colors that match the specified pattern.</p>
118
119<p>The format of the GetColorList function is:</p>
120
121<pre class="text">
122char **GetColorList(const char *pattern,size_t *number_colors,
123 ExceptionInfo *exception)
124</pre>
125
126<p>A description of each parameter follows:</p>
127
128<dd>
129</dd>
130
131<dd> </dd>
132<dl class="dl-horizontal">
133<dt>pattern</dt>
134<dd>Specifies a pointer to a text string containing a pattern. </dd>
135
136<dd> </dd>
137<dt>number_colors</dt>
138<dd> This integer returns the number of colors in the list. </dd>
139
140<dd> </dd>
141<dt>exception</dt>
142<dd>return any errors or warnings in this structure. </dd>
143
144<dd> </dd>
145</dl>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]146<h2><a href="http://www.imagemagick.org/api/MagickCore/color_8c.html" id="ListColorInfo">ListColorInfo</a></h2>
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame]147
148<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>
149
150<p>The format of the ListColorInfo method is:</p>
151
152<pre class="text">
153MagickBooleanType ListColorInfo(FILE *file,ExceptionInfo *exception)
154</pre>
155
156<p>A description of each parameter follows.</p>
157
158<dt>file</dt>
159<p>List color names to this file handle.</p>
160
161<dt>exception</dt>
162<p>return any errors or warnings in this structure.</p>
163
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]164<h2><a href="http://www.imagemagick.org/api/MagickCore/color_8c.html" id="QueryColorname">QueryColorname</a></h2>
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame]165
166<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>
167
168<p>UPDATE: the 'image' argument is no longer needed as all information should have been preset using GetPixelInfo().</p>
169
170<p>The format of the QueryColorname method is:</p>
171
172<pre class="text">
173MagickBooleanType QueryColorname(const Image *image,
174 const PixelInfo *color,const ComplianceType compliance,char *name,
175 ExceptionInfo *exception)
176</pre>
177
178<p>A description of each parameter follows.</p>
179
180<dt>image</dt>
181<p>the image. (not used! - color gets settings from GetPixelInfo()</p>
182
183<dt>color</dt>
184<p>the color intensities.</p>
185
186<dt>Compliance</dt>
187<p>Adhere to this color standard: SVG, X11, or XPM.</p>
188
189<dt>name</dt>
190<p>Return the color name or hex value.</p>
191
192<dt>exception</dt>
193<p>return any errors or warnings in this structure.</p>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]194
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