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cristy | 29f2c97 | 2015-07-28 13:37:46 +0000 | [diff] [blame] | 5 | <title>ImageMagick: MagickCore, C API for ImageMagick: Count the Colors in an Image</title> |
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cristy | 4e638cd | 2015-05-07 16:47:40 +0000 | [diff] [blame] | 46 | <div class="magick-header"> |
cristy | cecc949 | 2015-06-09 16:53:50 +0000 | [diff] [blame] | 47 | <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> |
| 48 | |
| 49 | <h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="AcquireColorCache">AcquireColorCache</a></h2> |
| 50 | |
| 51 | <p>AcquireColorCache() caches one or more color configurations which provides a mapping between color attributes and a color name.</p> |
| 52 | |
| 53 | <p>The format of the AcquireColorCache method is:</p> |
| 54 | |
| 55 | <pre class="text"> |
| 56 | LinkedListInfo *AcquireColorCache(const char *filename, |
| 57 | ExceptionInfo *exception) |
| 58 | </pre> |
| 59 | |
| 60 | <p>A description of each parameter follows:</p> |
| 61 | |
| 62 | <dd> |
| 63 | </dd> |
| 64 | |
| 65 | <dd> </dd> |
| 66 | <dl class="dl-horizontal"> |
| 67 | <dt>filename</dt> |
| 68 | <dd>the font file name. </dd> |
| 69 | |
| 70 | <dd> </dd> |
| 71 | <dt>exception</dt> |
| 72 | <dd>return any errors or warnings in this structure. </dd> |
| 73 | |
| 74 | <dd> </dd> |
| 75 | </dl> |
| 76 | <h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="GetColorInfoList">GetColorInfoList</a></h2> |
| 77 | |
| 78 | <p>GetColorInfoList() returns any colors that match the specified pattern.</p> |
| 79 | |
| 80 | <p>The format of the GetColorInfoList function is:</p> |
| 81 | |
| 82 | <pre class="text"> |
| 83 | const ColorInfo **GetColorInfoList(const char *pattern, |
| 84 | size_t *number_colors,ExceptionInfo *exception) |
| 85 | </pre> |
| 86 | |
| 87 | <p>A description of each parameter follows:</p> |
| 88 | |
| 89 | <dd> |
| 90 | </dd> |
| 91 | |
| 92 | <dd> </dd> |
| 93 | <dl class="dl-horizontal"> |
| 94 | <dt>pattern</dt> |
| 95 | <dd>Specifies a pointer to a text string containing a pattern. </dd> |
| 96 | |
| 97 | <dd> </dd> |
| 98 | <dt>number_colors</dt> |
| 99 | <dd> This integer returns the number of colors in the list. </dd> |
| 100 | |
| 101 | <dd> </dd> |
| 102 | <dt>exception</dt> |
| 103 | <dd>return any errors or warnings in this structure. </dd> |
| 104 | |
| 105 | <dd> </dd> |
| 106 | </dl> |
| 107 | <h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="GetColorList">GetColorList</a></h2> |
| 108 | |
| 109 | <p>GetColorList() returns any colors that match the specified pattern.</p> |
| 110 | |
| 111 | <p>The format of the GetColorList function is:</p> |
| 112 | |
| 113 | <pre class="text"> |
| 114 | char **GetColorList(const char *pattern,size_t *number_colors, |
| 115 | ExceptionInfo *exception) |
| 116 | </pre> |
| 117 | |
| 118 | <p>A description of each parameter follows:</p> |
| 119 | |
| 120 | <dd> |
| 121 | </dd> |
| 122 | |
| 123 | <dd> </dd> |
| 124 | <dl class="dl-horizontal"> |
| 125 | <dt>pattern</dt> |
| 126 | <dd>Specifies a pointer to a text string containing a pattern. </dd> |
| 127 | |
| 128 | <dd> </dd> |
| 129 | <dt>number_colors</dt> |
| 130 | <dd> This integer returns the number of colors in the list. </dd> |
| 131 | |
| 132 | <dd> </dd> |
| 133 | <dt>exception</dt> |
| 134 | <dd>return any errors or warnings in this structure. </dd> |
| 135 | |
| 136 | <dd> </dd> |
| 137 | </dl> |
| 138 | <h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="ListColorInfo">ListColorInfo</a></h2> |
| 139 | |
| 140 | <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> |
| 141 | |
| 142 | <p>The format of the ListColorInfo method is:</p> |
| 143 | |
| 144 | <pre class="text"> |
| 145 | MagickBooleanType ListColorInfo(FILE *file,ExceptionInfo *exception) |
| 146 | </pre> |
| 147 | |
| 148 | <p>A description of each parameter follows.</p> |
| 149 | |
| 150 | <dt>file</dt> |
| 151 | <p>List color names to this file handle.</p> |
| 152 | |
| 153 | <dt>exception</dt> |
| 154 | <p>return any errors or warnings in this structure.</p> |
| 155 | |
| 156 | <h2><a href="http://nextgen.imagemagick.org/api/MagickCore/color_8c.html" id="QueryColorname">QueryColorname</a></h2> |
| 157 | |
| 158 | <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> |
| 159 | |
| 160 | <p>UPDATE: the 'image' argument is no longer needed as all information should have been preset using GetPixelInfo().</p> |
| 161 | |
| 162 | <p>The format of the QueryColorname method is:</p> |
| 163 | |
| 164 | <pre class="text"> |
| 165 | MagickBooleanType QueryColorname(const Image *image, |
| 166 | const PixelInfo *color,const ComplianceType compliance,char *name, |
| 167 | ExceptionInfo *exception) |
| 168 | </pre> |
| 169 | |
| 170 | <p>A description of each parameter follows.</p> |
| 171 | |
| 172 | <dt>image</dt> |
| 173 | <p>the image. (not used! - color gets settings from GetPixelInfo()</p> |
| 174 | |
| 175 | <dt>color</dt> |
| 176 | <p>the color intensities.</p> |
| 177 | |
| 178 | <dt>Compliance</dt> |
| 179 | <p>Adhere to this color standard: SVG, X11, or XPM.</p> |
| 180 | |
| 181 | <dt>name</dt> |
| 182 | <p>Return the color name or hex value.</p> |
| 183 | |
| 184 | <dt>exception</dt> |
| 185 | <p>return any errors or warnings in this structure.</p> |
cristy | 2039843 | 2011-08-11 01:31:50 +0000 | [diff] [blame] | 186 | |
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