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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="navigation-index">[<a href="#SignatureImage">SignatureImage</a>]</p>
<h2><a href="http://www.imagemagick.org/api/MagickCore/signature
_8c.html" target="source" name="SignatureImage">SignatureImage</a></h2>
<div class="doc-section">
<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></ol>
<p>The format of the SignatureImage method is:</p>
<pre class="code">
MagickBooleanType SignatureImage(Image *image)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
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