Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / ba1758d71797bef0cbb262ab2ae7f5c7589d4f4a / . / www / api / compare.html
blob: 726fc960fbcddf0d42819218737c8a9553a8a648 [file] [log] [blame]
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
2 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
cristy2bd2a982011-02-15 00:52:58 +0000[diff] [blame]3<html version="-//W3C//DTD XHTML 1.1//EN"
4 xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
6 xsi:schemaLocation="http://www.w3.org/1999/xhtml
7 http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]8<head>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]9 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
10 <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U="/>
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]11 <title>ImageMagick: MagickCore, C API for ImageMagick: Compare an Image to a Reconstructed Image</title>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]12 <meta http-equiv="Content-Language" content="en-US"/>
13 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
14 <meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]15 <meta name="Application-name" content="ImageMagick"/>
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]16 <meta name="Description" content="Use ImageMagick to convert, edit, or compose bitmap images in a variety of formats. In addition resize, rotate, shear, distort and transform images."/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]17 <meta name="Application-url" content="http://www.imagemagick.org"/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]18 <meta name="Generator" content="PHP"/>
19 <meta name="Keywords" content="magickcore, c, api, for, imagemagick:, compare, an, image, to, a, reconstructed, image, ImageMagick, ImageMagic, MagickCore, MagickWand, PerlMagick, Magick++, RMagick, PythonMagick, JMagick, TclMagick, Image, Magick, Magic, Wand, ImageMagickObject, Swiss, Army, Knife, Image, Processing"/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]20 <meta name="Rating" content="GENERAL"/>
21 <meta name="Robots" content="INDEX, FOLLOW"/>
22 <meta name="Generator" content="ImageMagick Studio LLC"/>
23 <meta name="Author" content="ImageMagick Studio LLC"/>
24 <meta name="Revisit-after" content="2 DAYS"/>
25 <meta name="Resource-type" content="document"/>
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]26 <meta name="Copyright" content="Copyright (c) 1999-2011 ImageMagick Studio LLC"/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]27 <meta name="Distribution" content="Global"/>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]28 <link rel="icon" href="../../images/wand.png"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]29 <link rel="shortcut icon" href="../../images/wand.ico" type="images/x-icon"/>
30 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]31 <link rel="stylesheet" href="http://www.google.com/cse/style/look/default.css" type="text/css" />
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]32 <style type="text/css" media="all">
33 @import url("../../www/magick.css");
34 </style>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]35 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
cristy361f4662010-12-31 23:02:52 +0000[diff] [blame]36 <script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
37 <link rel="stylesheet" type="text/css" href="../fancybox/jquery.fancybox-1.3.4.css" media="screen" />
38 <script type="text/javascript">
39 $(document).ready(function() {
40 $("a[href$=.jpg],a[href$=.png],a[href$=.gif]").fancybox({
41 'transitionIn' : 'elastic',
42 'transitionOut' : 'elastic',
43 'overlayShow' : false,
44 'opacity' : true
45 });
46 });
47 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]48</head>
49
50<body id="www-imagemagick-org">
51<div class="titlebar">
cristyb52981c2011-03-19 17:09:31 +0000[diff] [blame]52<div style="margin: 17px auto; float: left;">
53 <script type="text/javascript">
54 <!--
55 google_ad_client = "pub-3129977114552745";
56 google_ad_slot = "5439289906";
57 google_ad_width = 728;
58 google_ad_height = 90;
59 //-->
60 </script>
61 <script type="text/javascript"
62 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
63 </script>
64</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]65<a href="http://www.imagemagick.org/discourse-server/">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]66 <img src="../../images/logo.jpg"
67 alt="ImageMagick Logo"
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]68 style="width: 123px; height: 118px; border: 0px; float: right;" /></a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]69<a href="../../index.html">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]70 <img src="../../images/sprite.jpg"
71 alt="ImageMagick Sprite"
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]72 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
73</div>
74
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]75<div class="westbar">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]76
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]77<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]78 <a title="About ImageMagick" href="../../index.html">About ImageMagick</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]79</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]80<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]81<div class="menu">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]82 <a title="Binary Releases" href="../../www/binary-releases.html">Binary Releases</a>
83</div>
84<div class="sub">
85 <a title="Binary Release: Unix" href="../../www/binary-releases.html#unix">Unix</a>
86</div>
87<div class="sub">
88 <a title="Binary Release: MacOS X" href="../../www/binary-releases.html#macosx">Mac OS X</a>
89</div>
90<div class="sub">
cristyda16f162011-02-19 23:52:17 +0000[diff] [blame]91 <a title="Binary Release: iPhone" href="../../www/binary-releases.html#iPhone">iPhone</a>
92</div>
93<div class="sub">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]94 <a title="Binary Release: Windows" href="../../www/binary-releases.html#windows">Windows</a>
95</div>
96<div class="sep"></div>
97<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]98 <a title="Command-line Tools" href="../../www/command-line-tools.html">Command-line Tools</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]99</div>
100<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]101 <a title="Command-line Tools: Processing" href="../../www/command-line-processing.html">Processing</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]102</div>
103<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]104 <a title="Command-line Tools: Options" href="../../www/command-line-options.html">Options</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]105</div>
106<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]107 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]108</div>
109<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]110 <a title="Program Interfaces" href="../../www/api.html">Program Interfaces</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]111</div>
112<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]113 <a title="Program Interface: MagickWand" href="../../www/magick-wand.html">MagickWand</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]114</div>
115<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]116 <a title="Program Interface: MagickCore" href="../../www/magick-core.html">MagickCore</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]117</div>
118<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]119 <a title="Program Interface: PerlMagick" href="../../www/perl-magick.html">PerlMagick</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]120</div>
121<div class="sub">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]122 <a title="Program Interface: Magick++" href="../../www/magick++.html">Magick++</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]123</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]124<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]125<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]126 <a title="Install from Source" href="../../www/install-source.html">Install from Source</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]127</div>
128<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]129 <a title="Install from Source: Unix" href="../../www/install-source.html#unix">Unix</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]130</div>
131<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]132 <a title="Install from Source: Windows" href="../../www/install-source.html#windows">Windows</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]133 </div>
134<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]135 <a title="Resources" href="../../www/resources.html">Resources</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]136</div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]137<div class="menu">
138 <a title="Architecture" href="../../www/architecture.html">Architecture</a>
139</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]140<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]141 <a title="Download" href="../../www/download.html">Download</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]142</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]143<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]144<div class="menu">
cristy52923442011-01-15 22:54:31 +0000[diff] [blame]145 <a title="Search" href="../../www/search.html">Search</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]146</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]147<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]148<div class="menu">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]149 <a title="Site Map" href="../../www/sitemap.html">Site Map</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]150</div>
151<div class="sub">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]152 <a title="Site Map: Links" href="../../www/links.html">Links</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]153</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]154<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]155<div class="menu">
cristy10549a12011-05-15 19:04:46 +0000[diff] [blame]156 <a rel="follow" title="Sponsors" href="../../www/sponsors.html">Sponsors:</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]157
cristyb52981c2011-03-19 17:09:31 +0000[diff] [blame]158<a href="http://www.networkredux.com">
159 <img src="../../images/networkredux.png" alt="[sponsor]"
160 style="margin-top: 4px; margin-left: 4px; border: 0px; float: left;" /></a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]161<div class="sponsbox">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]162<div class="sponsor">
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame^]163 <a rel="follow" title="Sponsor: Web Hosting Deals" href="http://www.webhostingdeals.org">Web Hosting Deals</a><!-- 201111010270 chee.hoa darin -->
164</div>
165<div class="sponsor">
166 <a rel="follow" title="Sponsor: Web Hosting Reviews" href="http://www.webhostingsecretrevealed.com">Web Hosting Secret Revealed</a><!-- 201204010540 iamchee jerry -->
167</div>
168<div class="sponsor">
169 <a rel="follow" title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
170</div>
171<div class="sponsor">
cristy4bf6e232011-05-21 01:43:33 +0000[diff] [blame]172 <a rel="follow" title="Sponsor: Web Hosting Break" href="http://www.webhostingbreak.com">Web Hosting Break</a><!-- 201109010090 ian@ian-m... -->
cristy45dbd322011-03-27 16:40:38 +0000[diff] [blame]173</div>
174<div class="sponsor">
cristy10549a12011-05-15 19:04:46 +0000[diff] [blame]175 <a rel="follow" title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201303011500 r.leo -->
cristy4c54bbb2011-03-17 13:53:13 +0000[diff] [blame]176</div>
177<div class="sponsor">
cristy575d5ee2011-05-24 01:59:01 +0000[diff] [blame]178 <a rel="follow" title="Sponsor: Website Hosting" href="http://www.hostreviewgeeks.com">Website Hosting</a><!-- 201110010090 alexanian media -->
cristy4bf6e232011-05-21 01:43:33 +0000[diff] [blame]179</div>
180<div class="sponsor">
cristy10549a12011-05-15 19:04:46 +0000[diff] [blame]181 <a rel="follow" title="Sponsor: Hotel München" href="http://www.messehotel-erb-muenchen.de">Hotel München</a><!-- 201111010450 cerb -->
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]182</div>
183<div class="sponsor">
cristy10549a12011-05-15 19:04:46 +0000[diff] [blame]184 <a rel="follow" title="Sponsor: Best Web Hosting" href="http://webhostinggeeks.com">Best Web Hosting</a><!-- 201110010720 -->
cristy5c4585b2010-11-11 00:13:57 +0000[diff] [blame]185</div>
186<div class="sponsor">
cristy10549a12011-05-15 19:04:46 +0000[diff] [blame]187 <a rel="follow" title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
cristyee742642011-02-26 02:49:59 +0000[diff] [blame]188</div>
189<div class="sponsor">
cristy10549a12011-05-15 19:04:46 +0000[diff] [blame]190 <a rel="follow" title="Sponsor: Web Hosting Reviews" href="http://www.webhostingmasters.com">Web Hosting Reviews</a><!-- 201107011500 affliatelabel -->
cristy851dbce2010-08-06 21:40:00 +0000[diff] [blame]191</div>
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]192<div class="sponsor">
cristy10549a12011-05-15 19:04:46 +0000[diff] [blame]193 <a rel="follow" title="Sponsor: Web Hosting Ratings" href="http://webhostingrating.com">Web Hosting Ratings</a><!-- 201110010720 -->
cristybaacd172011-04-30 23:11:03 +0000[diff] [blame]194</div>
195<div class="sponsor">
cristyc7364032011-05-27 02:05:42 +0000[diff] [blame]196 <a rel="follow" title="Sponsor: Autoteile Online Shop" href="http://www.autoteile-carparts.de">Autoteile Online Shop</a><!-- 2011080100030 autoteile-Carparts-->
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]197</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]198</div>
199</div>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]200</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]201
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]202<div class="eastbar">
cristyb52981c2011-03-19 17:09:31 +0000[diff] [blame]203
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]204</div>
205
206<div class="main">
207
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]208<h1>Module compare Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]209<p class="navigation-index">[<a href="#CompareImageChannels">CompareImageChannels</a> &bull; <a href="#GetImageChannelDistortion">GetImageChannelDistortion</a> &bull; <a href="#GetImageChannelDistrortion">GetImageChannelDistrortion</a> &bull; <a href="#IsImagesEqual">IsImagesEqual</a> &bull; <a href="#SimilarityImage">SimilarityImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]210
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]211<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="CompareImageChannels">CompareImageChannels</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]212<div class="doc-section">
213
214<p>CompareImageChannels() compares one or more image channels of an image to a reconstructed image and returns the difference image.</p>
215
216<p>The format of the CompareImageChannels method is:</p>
217
218<pre class="code">
219 Image *CompareImageChannels(const Image *image,
220 const Image *reconstruct_image,const ChannelType channel,
221 const MetricType metric,double *distortion,ExceptionInfo *exception)
222</pre>
223
224<p>A description of each parameter follows:</p>
225
226<h5>image</h5>
227<p>the image.</p>
228
229<h5>reconstruct_image</h5>
230<p>the reconstruct image.</p>
231
232<h5>channel</h5>
233<p>the channel.</p>
234
235<h5>metric</h5>
236<p>the metric.</p>
237
238<h5>distortion</h5>
239<p>the computed distortion between the images.</p>
240
241<h5>exception</h5>
242<p>return any errors or warnings in this structure.</p>
243
244 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]245<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageChannelDistortion">GetImageChannelDistortion</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]246<div class="doc-section">
247
248<p>GetImageChannelDistortion() compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.</p>
249
250<p>The format of the CompareImageChannels method is:</p>
251
252<pre class="code">
253 MagickBooleanType GetImageChannelDistortion(const Image *image,
254 const Image *reconstruct_image,const ChannelType channel,
255 const MetricType metric,double *distortion,ExceptionInfo *exception)
256</pre>
257
258<p>A description of each parameter follows:</p>
259
260<h5>image</h5>
261<p>the image.</p>
262
263<h5>reconstruct_image</h5>
264<p>the reconstruct image.</p>
265
266<h5>channel</h5>
267<p>the channel.</p>
268
269<h5>metric</h5>
270<p>the metric.</p>
271
272<h5>distortion</h5>
273<p>the computed distortion between the images.</p>
274
275<h5>exception</h5>
276<p>return any errors or warnings in this structure.</p>
277
278 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]279<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="GetImageChannelDistrortion">GetImageChannelDistrortion</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]280<div class="doc-section">
281
282<p>GetImageChannelDistrortion() compares the image channels of an image to a reconstructed image and returns the specified distortion metric for each channel.</p>
283
284<p>The format of the CompareImageChannels method is:</p>
285
286<pre class="code">
287 double *GetImageChannelDistortions(const Image *image,
288 const Image *reconstruct_image,const MetricType metric,
289 ExceptionInfo *exception)
290</pre>
291
292<p>A description of each parameter follows:</p>
293
294<h5>image</h5>
295<p>the image.</p>
296
297<h5>reconstruct_image</h5>
298<p>the reconstruct image.</p>
299
300<h5>metric</h5>
301<p>the metric.</p>
302
303<h5>exception</h5>
304<p>return any errors or warnings in this structure.</p>
305
306 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]307<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="IsImagesEqual">IsImagesEqual</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]308<div class="doc-section">
309
310<p>IsImagesEqual() measures the difference between colors at each pixel location of two images. A value other than 0 means the colors match exactly. Otherwise an error measure is computed by summing over all pixels in an image the distance squared in RGB space between each image pixel and its corresponding pixel in the reconstruct image. The error measure is assigned to these image members:</p>
311
312<pre class="text">
313 o mean_error_per_pixel: The mean error for any single pixel in
314 the image.
315</pre>
316
317<h5>normalized_mean_error</h5>
318<p>The normalized mean quantization error for any single pixel in the image. This distance measure is normalized to a range between 0 and 1. It is independent of the range of red, green, and blue values in the image.</p>
319
320<h5>normalized_maximum_error</h5>
321<p>The normalized maximum quantization error for any single pixel in the image. This distance measure is normalized to a range between 0 and 1. It is independent of the range of red, green, and blue values in your image.</p>
322
323<p>A small normalized mean square error, accessed as image->normalized_mean_error, suggests the images are very similar in spatial layout and color.</p>
324
325<p>The format of the IsImagesEqual method is:</p>
326
327<pre class="code">
328 MagickBooleanType IsImagesEqual(Image *image,
329 const Image *reconstruct_image)
330</pre>
331
332<p>A description of each parameter follows.</p>
333
334<h5>image</h5>
335<p>the image.</p>
336
337<h5>reconstruct_image</h5>
338<p>the reconstruct image.</p>
339
340 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]341<h2><a href="http://www.imagemagick.org/api/MagickCore/compare_8c.html" id="SimilarityImage">SimilarityImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]342<div class="doc-section">
343
344<p>SimilarityImage() compares the reference image of the image and returns the best match offset. In addition, it returns a similarity image such that an exact match location is completely white and if none of the pixels match, black, otherwise some gray level in-between.</p>
345
346<p>The format of the SimilarityImageImage method is:</p>
347
348<pre class="code">
349 Image *SimilarityImage(const Image *image,const Image *reference,
350 RectangleInfo *offset,double *similarity,ExceptionInfo *exception)
351</pre>
352
353<p>A description of each parameter follows:</p>
354
355<h5>image</h5>
356<p>the image.</p>
357
358<h5>reference</h5>
359<p>find an area of the image that closely resembles this image.</p>
360
361<p>o the best match offset of the reference image within the image.</p>
362
363<h5>similarity</h5>
364<p>the computed similarity between the images.</p>
365
366<h5>exception</h5>
367<p>return any errors or warnings in this structure.</p>
368
369 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]370
371</div>
372
373<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]374 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]375 <span id="linkbar-center">
376 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]377 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]378 </span>
379 <span id="linkbar-east">&nbsp;</span>
380 </div>
381 <div class="footer">
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]382 <span id="footer-west">&copy; 1999-2011 ImageMagick Studio LLC</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]383 <span id="footer-east"> <a href="../http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
384 </div>
385 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]386 <script type="text/javascript">
387 var _gaq = _gaq || [];
388 _gaq.push(['_setAccount', 'UA-17690367-1']);
389 _gaq.push(['_trackPageview']);
390
391 (function() {
392 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
393 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
394 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
395 })();
396 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]397</body>
398</html>