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<title>ImageMagick: MagickCore, C API for ImageMagick: Compute a Message Digest for an Image</title>
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<p class="text-center"><a href="signature.html#SignatureImage">SignatureImage</a></p>
<h2><a href="http://www.imagemagick.org/api/MagickCore/signature_8c.html" id="SignatureImage">SignatureImage</a></h2>
<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>
<p>The format of the SignatureImage method is:</p>
<pre class="text">
MagickBooleanType SignatureImage(Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>image</dt>
<dd>the image. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
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