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cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame]3<head>
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]7 <title>ImageMagick: MagickCore, C API for ImageMagick: Colormap Methods</title>
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57<p class="text-center"><a href="colormap.html#AcquireImageColormap">AcquireImageColormap</a> • <a href="colormap.html#CycleColormap">CycleColormap</a></p>
cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame]58
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]59<div class="magick-header">
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]60<h2><a href="http://www.imagemagick.org/api/MagickCore/colormap_8c.html" id="AcquireImageColormap">AcquireImageColormap</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]61
62<p>AcquireImageColormap() allocates an image colormap and initializes it to a linear gray colorspace. If the image already has a colormap, it is replaced. AcquireImageColormap() returns MagickTrue if successful, otherwise MagickFalse if there is not enough memory.</p>
63
64<p>The format of the AcquireImageColormap method is:</p>
65
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]66<pre class="text">
67MagickBooleanType AcquireImageColormap(Image *image,const size_t colors,
68 ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]69</pre>
70
71<p>A description of each parameter follows:</p>
72
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]73<dd>
74</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]75
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]76<dd> </dd>
77<dl class="dl-horizontal">
78<dt>image</dt>
79<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]80
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]81<dd> </dd>
82<dt>colors</dt>
83<dd>the number of colors in the image colormap. </dd>
84
85<dd> </dd>
86<dt>exception</dt>
87<dd>return any errors or warnings in this structure. </dd>
88
89<dd> </dd>
90</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]91<h2><a href="http://www.imagemagick.org/api/MagickCore/colormap_8c.html" id="CycleColormap">CycleColormap</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]92
93<p>CycleColormap() displaces an image's colormap by a given number of positions. If you cycle the colormap a number of times you can produce a psychodelic effect.</p>
94
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]95<p>WARNING: this assumes an images colormap is in a well know and defined order. Currently Imagemagick has no way of setting that order.</p>
96
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]97<p>The format of the CycleColormapImage method is:</p>
98
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]99<pre class="text">
100MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace,
101 ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]102</pre>
103
104<p>A description of each parameter follows:</p>
105
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]106<dd>
107</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]108
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]109<dd> </dd>
110<dl class="dl-horizontal">
111<dt>image</dt>
112<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]113
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]114<dd> </dd>
115<dt>displace</dt>
116<dd> displace the colormap this amount. </dd>
cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame]117
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]118<dd> </dd>
119<dt>exception</dt>
120<dd>return any errors or warnings in this structure. </dd>
121
122<dd> </dd>
123</dl>
cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame]124</div>
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