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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]7 <title>ImageMagick: MagickCore, C API for ImageMagick: Count the Colors in an Image</title>
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cristy4e638cd2015-05-07 16:47:40 +0000[diff] [blame]58<div class="magick-header">
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame^]59<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>
60
61<h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="AcquireColorCache">AcquireColorCache</a></h2>
62
63<p>AcquireColorCache() caches one or more color configurations which provides a mapping between color attributes and a color name.</p>
64
65<p>The format of the AcquireColorCache method is:</p>
66
67<pre class="text">
68LinkedListInfo *AcquireColorCache(const char *filename,
69 ExceptionInfo *exception)
70</pre>
71
72<p>A description of each parameter follows:</p>
73
74<dd>
75</dd>
76
77<dd> </dd>
78<dl class="dl-horizontal">
79<dt>filename</dt>
80<dd>the font file name. </dd>
81
82<dd> </dd>
83<dt>exception</dt>
84<dd>return any errors or warnings in this structure. </dd>
85
86<dd> </dd>
87</dl>
88<h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="GetColorInfoList">GetColorInfoList</a></h2>
89
90<p>GetColorInfoList() returns any colors that match the specified pattern.</p>
91
92<p>The format of the GetColorInfoList function is:</p>
93
94<pre class="text">
95const ColorInfo **GetColorInfoList(const char *pattern,
96 size_t *number_colors,ExceptionInfo *exception)
97</pre>
98
99<p>A description of each parameter follows:</p>
100
101<dd>
102</dd>
103
104<dd> </dd>
105<dl class="dl-horizontal">
106<dt>pattern</dt>
107<dd>Specifies a pointer to a text string containing a pattern. </dd>
108
109<dd> </dd>
110<dt>number_colors</dt>
111<dd> This integer returns the number of colors in the list. </dd>
112
113<dd> </dd>
114<dt>exception</dt>
115<dd>return any errors or warnings in this structure. </dd>
116
117<dd> </dd>
118</dl>
119<h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="GetColorList">GetColorList</a></h2>
120
121<p>GetColorList() returns any colors that match the specified pattern.</p>
122
123<p>The format of the GetColorList function is:</p>
124
125<pre class="text">
126char **GetColorList(const char *pattern,size_t *number_colors,
127 ExceptionInfo *exception)
128</pre>
129
130<p>A description of each parameter follows:</p>
131
132<dd>
133</dd>
134
135<dd> </dd>
136<dl class="dl-horizontal">
137<dt>pattern</dt>
138<dd>Specifies a pointer to a text string containing a pattern. </dd>
139
140<dd> </dd>
141<dt>number_colors</dt>
142<dd> This integer returns the number of colors in the list. </dd>
143
144<dd> </dd>
145<dt>exception</dt>
146<dd>return any errors or warnings in this structure. </dd>
147
148<dd> </dd>
149</dl>
150<h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="ListColorInfo">ListColorInfo</a></h2>
151
152<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>
153
154<p>The format of the ListColorInfo method is:</p>
155
156<pre class="text">
157MagickBooleanType ListColorInfo(FILE *file,ExceptionInfo *exception)
158</pre>
159
160<p>A description of each parameter follows.</p>
161
162<dt>file</dt>
163<p>List color names to this file handle.</p>
164
165<dt>exception</dt>
166<p>return any errors or warnings in this structure.</p>
167
168<h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="QueryColorname">QueryColorname</a></h2>
169
170<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>
171
172<p>UPDATE: the 'image' argument is no longer needed as all information should have been preset using GetPixelInfo().</p>
173
174<p>The format of the QueryColorname method is:</p>
175
176<pre class="text">
177MagickBooleanType QueryColorname(const Image *image,
178 const PixelInfo *color,const ComplianceType compliance,char *name,
179 ExceptionInfo *exception)
180</pre>
181
182<p>A description of each parameter follows.</p>
183
184<dt>image</dt>
185<p>the image. (not used! - color gets settings from GetPixelInfo()</p>
186
187<dt>color</dt>
188<p>the color intensities.</p>
189
190<dt>Compliance</dt>
191<p>Adhere to this color standard: SVG, X11, or XPM.</p>
192
193<dt>name</dt>
194<p>Return the color name or hex value.</p>
195
196<dt>exception</dt>
197<p>return any errors or warnings in this structure.</p>
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