1 2 3 4 5<!DOCTYPE html> 6<html lang="en"> 7<head> 8 <meta charset="utf-8" /> 9 <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1,shrink-to-fit=no" /> 10 <title>ImageMagick - MagickCore, C API: Compute a Message Digest for an Image</title> 11 <meta name="application-name" content="ImageMagick" /> 12 <meta name="description" content="Use ImageMagick® to create, edit, compose, and convert bitmap images. Resize an image, crop it, change its shades and colors, add captions, and more." /> 13 <meta name="application-url" content="https://imagemagick.org" /> 14 <meta name="generator" content="PHP" /> 15 <meta name="keywords" content="magickcore, c, api:, compute, a, message, digest, for, an, image, ImageMagick, PerlMagick, image processing, image, photo, software, Magick++, OpenMP, convert" /> 16 <meta name="rating" content="GENERAL" /> 17 <meta name="robots" content="INDEX, FOLLOW" /> 18 <meta name="generator" content="ImageMagick Studio LLC" /> 19 <meta name="author" content="ImageMagick Studio LLC" /> 20 <meta name="revisit-after" content="2 DAYS" /> 21 <meta name="resource-type" content="document" /> 22 <meta name="copyright" content="Copyright (c) 1999-2020 ImageMagick Studio LLC" /> 23 <meta name="distribution" content="Global" /> 24 <meta name="magick-serial" content="P131-S030410-R485315270133-P82224-A6668-G1245-1" /> 25 <meta property='og:url' content='../../' /> 26 <meta property='og:title' content='ImageMagick' /> 27 <meta property='og:image' content='../../images/logo.png' /> 28 <meta property='og:type' content='website' /> 29 <meta property='og:site_name' content='ImageMagick' /> 30 <meta property='og:description' content="Convert, Edit, or Compose Bitmap Images" /> 31 <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4" /> 32 <link href="../www/api/signature.html" rel="canonical" /> 33 <link href="../../www/images/wand.png" rel="icon" /> 34 <link href="../../www/images/wand.ico" rel="shortcut icon" /> 35 <link href="../../www/assets/magick.css" rel="stylesheet" /> 36</head> 37<body> 38 <nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark"> 39 <a class="navbar-brand" href="../../"><img class="d-block" id="icon" alt="ImageMagick" width="32" height="32" src="../../www/images/wand.ico"/></a> 40 <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsMagick" aria-controls="navbarsMagick" aria-expanded="false" aria-label="Toggle navigation"> 41 <span class="navbar-toggler-icon"></span> 42 </button> 43 44 <div class="navbar-collapse collapse" id="navbarsMagick" style=""> 45 <ul class="navbar-nav mr-auto"> 46 <li class="nav-item "> 47 <a class="nav-link" href="../../www/">Home <span class="sr-only">(current)</span></a> 48 </li> 49 <li class="nav-item "> 50 <a class="nav-link" href="../../www/www/download.html">Download</a> 51 </li> 52 <li class="nav-item "> 53 <a class="nav-link" href="../../www/www/command-line-tools.html">Tools</a> 54 </li> 55 <li class="nav-item "> 56 <a class="nav-link" href="../../www/www/command-line-processing.html">Command-line</a> 57 </li> 58 <li class="nav-item "> 59 <a class="nav-link" href="../../www/www/resources.html">Resources</a> 60 </li> 61 <li class="nav-item "> 62 <a class="nav-link" href="../../www/www/develop.html">Develop</a> 63 </li> 64 <li class="nav-item"> 65 <a class="nav-link" target="_blank" href="https://imagemagick.org/discourse-server/">Community</a> 66 </li> 67 </ul> 68 <form class="form-inline my-2 my-lg-0" action="../../www/www/search.html"> 69 <input class="form-control mr-sm-2" type="text" name="q" placeholder="Search" aria-label="Search"> 70 <button class="btn btn-outline-success my-2 my-sm-0" type="submit" name="sa">Search</button> 71 </form> 72 </div> 73 </nav> 74 <div class="container"> 75 <script async="async" src="https://localhost/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle" 76 style="display:block" 77 data-ad-client="ca-pub-3129977114552745" 78 data-ad-slot="6345125851" 79 data-full-width-responsive="true" 80 data-ad-format="horizontal"></ins> 81 <script> 82 (adsbygoogle = window.adsbygoogle || []).push({}); 83 </script> 84 85 </div> 86 87 <main class="container"> 88 <div class="magick-template"> 89<div class="magick-header"> 90<p class="text-center"><a href="signature.html#SignatureImage">SignatureImage</a></p> 91 92<h2><a href="../../api/MagickCore/signature_8c.html" id="SignatureImage">SignatureImage</a></h2> 93 94<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> 95 96<p>The format of the SignatureImage method is:</p> 97 98<pre class="text"> 99MagickBooleanType SignatureImage(Image *image,ExceptionInfo *exception) 100</pre> 101 102<p>A description of each parameter follows:</p> 103 104<dd> 105</dd> 106 107<dd> </dd> 108<dl class="dl-horizontal"> 109<dt>image</dt> 110<dd>the image. </dd> 111 112<dd> </dd> 113<dt>exception</dt> 114<dd>return any errors or warnings in this structure. </dd> 115 116<dd> </dd> 117</dl> 118</div> 119 </div> 120 </main><!-- /.container --> 121 <footer class="magick-footer"> 122 <p><a href="../../www/www/security-policy.html">Security</a> • 123 <a href="../../www/www/architecture.html">Architecture</a> 124 125 <a href="signature.html#"><img class="d-inline" id="wand" alt="And Now a Touch of Magick" width="16" height="16" src="../../www/images/wand.ico"/></a> 126 127 <a href="../../www/www/links.html">Related</a> • 128 <a href="../../www/www/sitemap.html">Sitemap</a> 129 <br/> 130 <a href="../../www/www/support.html">Donate</a> • 131 <a href="http://pgp.mit.edu/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> • 132 <a href="../../www/www/contact.html">Contact Us</a> 133 <br/> 134 <small>© 1999-2020 ImageMagick Studio LLC</small></p> 135 </footer> 136 137 <!-- Javascript assets --> 138 <script src="../../www/assets/magick.js" crossorigin="anonymous"></script> 139 <script>window.jQuery || document.write('<script src="https://localhost/ajax/libs/jquery/3.4.1/jquery.min.js"><\/script>')</script> 140</body> 141</html> 142<!-- Magick Cache 4th January 2020 05:26 -->