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Cristy36421ee2015-08-28 11:58:20 -0400[diff] [blame]4
cristy29f2c972015-07-28 13:37:46 +0000[diff] [blame]5 <title>ImageMagick: MagickCore, C API for ImageMagick: Colormap Methods</title>
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8 <meta name="description" content="ImageMagick® is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.">
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43 </div>
44</div>
45<div class="container">
cristy4e638cd2015-05-07 16:47:40 +0000[diff] [blame]46<div class="magick-header">
cristy99513ee2015-06-21 00:00:03 +0000[diff] [blame]47<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]48
cristycecc9492015-06-09 16:53:50 +0000[diff] [blame]49<h2><a href="http://nextgen.imagemagick.org/api/MagickCore/colormap_8c.html" id="AcquireImageColormap">AcquireImageColormap</a></h2>
50
51<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>
52
53<p>The format of the AcquireImageColormap method is:</p>
54
55<pre class="text">
56MagickBooleanType AcquireImageColormap(Image *image,const size_t colors,
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>image</dt>
68<dd>the image. </dd>
69
70<dd> </dd>
71<dt>colors</dt>
72<dd>the number of colors in the image colormap. </dd>
73
74<dd> </dd>
75<dt>exception</dt>
76<dd>return any errors or warnings in this structure. </dd>
77
78<dd> </dd>
79</dl>
80<h2><a href="http://nextgen.imagemagick.org/api/MagickCore/colormap_8c.html" id="CycleColormap">CycleColormap</a></h2>
81
82<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>
83
84<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>
85
86<p>The format of the CycleColormapImage method is:</p>
87
88<pre class="text">
89MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace,
90 ExceptionInfo *exception)
91</pre>
92
93<p>A description of each parameter follows:</p>
94
95<dd>
96</dd>
97
98<dd> </dd>
99<dl class="dl-horizontal">
100<dt>image</dt>
101<dd>the image. </dd>
102
103<dd> </dd>
104<dt>displace</dt>
105<dd> displace the colormap this amount. </dd>
106
107<dd> </dd>
108<dt>exception</dt>
109<dd>return any errors or warnings in this structure. </dd>
110
111<dd> </dd>
112</dl>
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