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 213 \r
 214 <h1>Module feature Methods</h1>
 215 <p class="navigation-index">[<a href="#GetImageFeatures">GetImageFeatures</a>]</p>
 216
 217 <h2><a href="http://www.imagemagick.org/api/MagickCore/feature_8c.html" id="GetImageFeatures">GetImageFeatures</a></h2>
 218 <div class="doc-section">
 219
 220 <p>GetImageFeatures() 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>
 221
 222 <pre class="text">
 223   channel_features=GetImageFeatures(image,1,exception);
 224   contrast=channel_features[RedChannel].contrast[0];
 225 </pre>
 226
 227 <p>Use MagickRelinquishMemory() to free the features buffer.</p>
 228
 229 <p>The format of the GetImageFeatures method is:</p>
 230
 231 <pre class="code">
 232   ChannelFeatures *GetImageFeatures(const Image *image,
 233     const size_t distance,ExceptionInfo *exception)
 234 </pre>
 235
 236 <p>A description of each parameter follows:</p>
 237
 238 <h5>image</h5>
 239 <p>the image.</p>
 240
 241 <h5>distance</h5>
 242 <p>the distance.</p>
 243
 244 <h5>exception</h5>
 245 <p>return any errors or warnings in this structure.</p>
 246
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