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 210 \r
 211 <h1>Module signature Methods</h1>
 212 <p class="navigation-index">[<a href="#SignatureImage">SignatureImage</a>]</p>
 213
 214 <h2><a href="http://www.imagemagick.org/api/MagickCore/signature_8c.html" id="SignatureImage">SignatureImage</a></h2>
 215 <div class="doc-section">
 216
 217 <p>SignatureImage() computes a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm.  This signature uniquely identifies the image and is convenient for determining if an image has been modified or whether two images are identical.</p>
 218
 219 <p>The format of the SignatureImage method is:</p>
 220
 221 <pre class="code">
 222   MagickBooleanType SignatureImage(Image *image)
 223 </pre>
 224
 225 <p>A description of each parameter follows:</p>
 226
 227 <h5>image</h5>
 228 <p>the image.</p>
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