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84<p class="text-center"><a href="signature.html#SignatureImage">SignatureImage</a></p>
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86<h2><a href="../../api/MagickCore/signature_8c.html" id="SignatureImage">SignatureImage</a></h2>
87
88<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>
89
90<p>The format of the SignatureImage method is:</p>
91
92<pre class="text">
93MagickBooleanType SignatureImage(Image *image,ExceptionInfo *exception)
94</pre>
95
96<p>A description of each parameter follows:</p>
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100
101<dd> </dd>
102<dl class="dl-horizontal">
103<dt>image</dt>
104<dd>the image. </dd>
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107<dt>exception</dt>
108<dd>return any errors or warnings in this structure. </dd>
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