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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]189<h1>Module signature
190 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]191<p class="navigation-index">[<a href="#SignatureImage">SignatureImage</a>]</p>
192
cristy70b59b62011-02-07 19:09:57 +0000[diff] [blame]193<h2><a href="http://www.imagemagick.org/api/MagickCore/signature
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]194_8c.html" id="SignatureImage">SignatureImage</a></h2>
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196
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]197<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]198
199<p>The format of the SignatureImage method is:</p>
200
201<pre class="code">
202 MagickBooleanType SignatureImage(Image *image)
203</pre>
204
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]205<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]206
207<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]208<p>the image.</p>
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