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 195 \r
 196 <h1>Module feature Methods</h1>
 197 <p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
 198
 199 <h2><a href="http://www.imagemagick.org/api/MagickCore/feature_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
 200 <div class="doc-section">
 201
 202 <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>
 203
 204 <pre class="text">
 205   channel_features=GetImageChannelFeatures(image,1,exception);
 206   contrast=channel_features[RedChannel].contrast[0];
 207 </pre>
 208
 209 <p>Use MagickRelinquishMemory() to free the features buffer.</p>
 210
 211 <p>The format of the GetImageChannelFeatures method is:</p>
 212
 213 <pre class="code">
 214   ChannelFeatures *GetImageChannelFeatures(const Image *image,
 215     const size_t distance,ExceptionInfo *exception)
 216 </pre>
 217
 218 <p>A description of each parameter follows:</p>
 219
 220 <h5>image</h5>
 221 <p>the image.</p>
 222
 223 <h5>distance</h5>
 224 <p>the distance.</p>
 225
 226 <h5>exception</h5>
 227 <p>return any errors or warnings in this structure.</p>
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