1 2 3 4 5 <!DOCTYPE html> 6 <html lang="en"> 7 <head> 8 <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4" /> 9 <title>ImageMagick: MagickCore, C API for ImageMagick: Compute a Message Digest for an Image</title> 10 <meta http-equiv="content-type" content="text/html; charset=utf-8"/> 11 <meta name="application-name" content="ImageMagick"/> 12 <meta name="description" content="ImageMagick is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bzier curves."/> 13 <meta name="application-url" content="http://www.imagemagick.org"/> 14 <meta name="generator" content="PHP"/> 15 <meta name="keywords" content="magickcore, c, api, for, imagemagick:, 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) 1999-2016 ImageMagick Studio LLC"/> 23 <meta name="distribution" content="Global"/> 24 <meta name="magick-serial" content="P131-S030410-R485315270133-P82224-A6668-G1245-1"/> 25 <link rel="icon" href="../image/wand.png"/> 26 <link rel="shortcut icon" href="../image/wand.ico"/> 27 <link rel="stylesheet" href="../css/magick.php"/> 28 </head> 29 <body> 30 <div class="main"> 31 <div class="magick-masthead"> 32 <div class="container"> 33 <script async="async" src="http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle" 34 style="display:block" 35 data-ad-client="ca-pub-3129977114552745" 36 data-ad-slot="6345125851" 37 data-ad-format="auto"></ins> 38 <script> 39 (adsbygoogle = window.adsbygoogle || []).push({}); 40 </script> 41 <nav class="magick-nav"> 42 <a class="magick-nav-item " href="../index.php">Home</a> 43 <a class="magick-nav-item " href="../script/binary-releases.php">Download</a> 44 <a class="magick-nav-item " href="../script/command-line-tools.php">Tools</a> 45 <a class="magick-nav-item " href="../script/command-line-options.php">Options</a> 46 <a class="magick-nav-item " href="../script/resources.php">Resources</a> 47 <a class="magick-nav-item " href="../script/api.php">Develop</a> 48 <a class="magick-nav-item " href="../script/search.php">Search</a> 49 <a class="magick-nav-item pull-right" href="http://www.imagemagick.org/discourse-server/">Community</a> 50 </nav> 51 </div> 52 </div> 53 <div class="container"> 54 <div class="magick-header"> 55 <p class="text-center"><a href="signature.php#SignatureImage">SignatureImage</a></p> 56 57 <h2><a href="http://nextgen.imagemagick.org/api/MagickCore/signature_8c.html" id="SignatureImage">SignatureImage</a></h2> 58 59 <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> 60 61 <p>The format of the SignatureImage method is:</p> 62 63 <pre class="text"> 64 MagickBooleanType SignatureImage(Image *image,ExceptionInfo *exception) 65 </pre> 66 67 <p>A description of each parameter follows:</p> 68 69 <dd> 70 </dd> 71 72 <dd> </dd> 73 <dl class="dl-horizontal"> 74 <dt>image</dt> 75 <dd>the image. </dd> 76 77 <dd> </dd> 78 <dt>exception</dt> 79 <dd>return any errors or warnings in this structure. </dd> 80 81 <dd> </dd> 82 </dl> 83 </div> 84 <footer class="magick-footer"> 85 <p><a href="../script/support.php">Donate</a> 86 <a href="../script/sitemap.php">Sitemap</a> 87 <a href="../script/links.php">Related</a> 88 <a href="../script/architecture.php">Architecture</a> 89 </p> 90 <p><a href="signature.php#">Back to top</a> 91 <a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> 92 <a href="../script/contact.php">Contact Us</a></p> 93 <p><small> 1999-2016 ImageMagick Studio LLC</small></p> 94 </footer> 95 </div><!-- /.container --> 96 97 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script> 98 <script src="http://nextgen.imagemagick.org/js/magick.php"></script> 99 </div> 100 </body> 101 </html> 102
