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     55 <p class="text-center"><a href="signature.php#SignatureImage">SignatureImage</a></p>
     56 
     57 <h2><a href="http://nextgen.imagemagick.org/api/MagickCore/signature_8c.html" id="SignatureImage">SignatureImage</a></h2>
     58 
     59 <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>
     60 
     61 <p>The format of the SignatureImage method is:</p>
     62 
     63 <pre class="text">
     64 MagickBooleanType SignatureImage(Image *image,ExceptionInfo *exception)
     65 </pre>
     66 
     67 <p>A description of each parameter follows:</p>
     68 
     69 <dd>
     70 </dd>
     71 
     72 <dd> </dd>
     73 <dl class="dl-horizontal">
     74 <dt>image</dt>
     75 <dd>the image. </dd>
     76 
     77 <dd> </dd>
     78 <dt>exception</dt>
     79 <dd>return any errors or warnings in this structure. </dd>
     80 
     81 <dd>  </dd>
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