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cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]11 <link rel="shortcut icon" href="../../images/wand.ico" type="images/vnd.microsoft.icon"/>
12 <title>ImageMagick: MagickCore, C API for ImageMagick: Compute a Message Digest for an Image</title>
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cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]155<p class="navigation-index">[<a href="#SignatureImage">SignatureImage</a>]</p>
156
157<h2><a href="http://www.imagemagick.org/api/MagickCore/signature
158_8c.html" target="source" name="SignatureImage">SignatureImage</a></h2>
159<div class="doc-section">
160
161<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>
162
163<p>The format of the SignatureImage method is:</p>
164
165<pre class="code">
166 MagickBooleanType SignatureImage(Image *image)
167</pre>
168
169<p>A description of each parameter follows:</p></ol>
170
171<h5>image</h5>
172<ol><p>the image.</p></ol>
173
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