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 201 \r
 202 <h1>Module feature Methods</h1>
 203 <p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
 204
 205 <h2><a href="http://www.imagemagick.org/api/MagickCore/feature_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
 206 <div class="doc-section">
 207
 208 <p>GetImageChannelFeatures() returns features for each channel in the image in each of four directions (horizontal, vertical, left and right diagonals) for the specified distance.  The features include the angular second moment, contrast, correlation, sum of squares: variance, inverse difference moment, sum average, sum varience, sum entropy, entropy, difference variance,  difference entropy, information measures of correlation 1, information measures of correlation 2, and maximum correlation coefficient.  You can access the red channel contrast, for example, like this:</p>
 209
 210 <pre class="text">
 211   channel_features=GetImageChannelFeatures(image,1,exception);
 212   contrast=channel_features[RedChannel].contrast[0];
 213 </pre>
 214
 215 <p>Use MagickRelinquishMemory() to free the features buffer.</p>
 216
 217 <p>The format of the GetImageChannelFeatures method is:</p>
 218
 219 <pre class="code">
 220   ChannelFeatures *GetImageChannelFeatures(const Image *image,
 221     const size_t distance,ExceptionInfo *exception)
 222 </pre>
 223
 224 <p>A description of each parameter follows:</p>
 225
 226 <h5>image</h5>
 227 <p>the image.</p>
 228
 229 <h5>distance</h5>
 230 <p>the distance.</p>
 231
 232 <h5>exception</h5>
 233 <p>return any errors or warnings in this structure.</p>
 234
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