Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / efb2bdbaee273dc2880f2520ee0d9989694ca362 / . / www / magick-core.html
blob: 29605b90198be65b65c38efd300a057429a4a327 [file] [log] [blame]
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]1
2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
3 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
cristy2c839602010-04-03 02:32:08 +0000[diff] [blame]4<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]5<head>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
7 <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U="/>
8 <title>ImageMagick: MagickCore, Low-level C API for ImageMagick</title/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]9 <meta http-equiv="Content-Language" content="en-US"/>
10 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
11 <meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]12 <meta name="Application-name" content="ImageMagick"/>
13 <meta name="Description" content="ImageMagick® is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves. ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you can freely use, copy, modify, and distribute. Its license is compatible with the GPL. It runs on all major operating systems. The functionality of ImageMagick is typically utilized from the command line or you can use the features from programs written in your favorite programming language. Choose from these interfaces: MagickCore (C), MagickWand (C), ChMagick (Ch), Magick++ (C++), JMagick (Java), L-Magick (Lisp), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP (PHP), PythonMagick (Python), RMagick (Ruby), or TclMagick (Tcl/TK). With a language interface, use ImageMagick to modify or create images automagically and dynamically."/>
14 <meta name="Application-url" content="http://www.imagemagick.org"/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]15 <meta name="Generator" content="PHP"/>
16 <meta name="Keywords" content="magickcore, low-level, c, api, for, imagemagick, 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]17 <meta name="Rating" content="GENERAL"/>
18 <meta name="Robots" content="INDEX, FOLLOW"/>
19 <meta name="Generator" content="ImageMagick Studio LLC"/>
20 <meta name="Author" content="ImageMagick Studio LLC"/>
21 <meta name="Revisit-after" content="2 DAYS"/>
22 <meta name="Resource-type" content="document"/>
cristy16af1cb2009-12-11 21:38:29 +0000[diff] [blame]23 <meta name="Copyright" content="Copyright (c) 1999-2010 ImageMagick Studio LLC"/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]24 <meta name="Distribution" content="Global"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]25 <link rel="icon" href="../images/wand.png" sizes="32x32"/>
26 <link rel="shortcut icon" href="../images/wand.ico" type="images/x-icon"/>
27 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
28 <style type="text/css" media="all">
29 @import url("../www/magick.css");
30 </style>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]31</head>
32
33<body id="www-imagemagick-org">
34<div class="titlebar">
35<a href="../index.html">
36 <img src="../images/script.png" alt="[ImageMagick]"
37 style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
38<a href="http://www.networkredux.com">
39 <img src="../images/networkredux.png" alt="[sponsor]"
40 style="margin: 45px auto; border: 0px; float: left;" /></a>
41<a href="http://www.imagemagick.org/discourse-server/">
42 <img src="../images/logo.jpg" alt=""
43 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
44<a href="../index.html">
45 <img src="../images/sprite.jpg" alt=""
46 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
47</div>
48
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]49<div class="westbar">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]50
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]51<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]52 <a title="About ImageMagick" href="../index.html">About ImageMagick</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]53</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]54<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]55<div class="menu">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]56 <a title="Binary Releases" href="../www/binary-releases.html">Binary Releases</a>
57</div>
58<div class="sub">
59 <a title="Binary Release: Unix" href="../www/binary-releases.html#unix">Unix</a>
60</div>
61<div class="sub">
62 <a title="Binary Release: MacOS X" href="../www/binary-releases.html#macosx">Mac OS X</a>
63</div>
64<div class="sub">
65 <a title="Binary Release: Windows" href="../www/binary-releases.html#windows">Windows</a>
66</div>
67<div class="sep"></div>
68<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]69 <a title="Command-line Tools" href="../www/command-line-tools.html">Command-line Tools</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]70</div>
71<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]72 <a title="Command-line Tools: Processing" href="../www/command-line-processing.html">Processing</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]73</div>
74<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]75 <a title="Command-line Tools: Options" href="../www/command-line-options.html">Options</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]76</div>
77<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]78 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]79</div>
80<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]81 <a title="Program Interfaces" href="../www/api.html">Program Interfaces</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]82</div>
83<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]84 <a title="Program Interface: MagickWand" href="../www/magick-wand.html">MagickWand</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]85</div>
86<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]87 <a title="Program Interface: MagickCore" href="../www/magick-core.html">MagickCore</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]88</div>
89<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]90 <a title="Program Interface: PerlMagick" href="../www/perl-magick.html">PerlMagick</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]91</div>
92<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]93 <a title="Program Interface: Magick++" href="../Magick++/">Magick++</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]94</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]95<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]96<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]97 <a title="Install from Source" href="../www/install-source.html">Install from Source</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]98</div>
99<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]100 <a title="Install from Source: Unix" href="../www/install-source.html#unix">Unix</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]101</div>
102<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]103 <a title="Install from Source: Windows" href="../www/install-source.html#windows">Windows</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]104 </div>
105<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]106 <a title="Resources" href="../www/resources.html">Resources</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]107</div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]108<div class="menu">
109 <a title="Architecture" href="../www/architecture.html">Architecture</a>
110</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]111<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]112 <a title="Download" href="../www/download.html">Download</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]113</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]114<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]115<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]116 <a title="Search" href="http://www.imagemagick.org/script/search.php">Search</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]117</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]118<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]119<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]120 <a title="Site Map"href="../www/sitemap.html">Site Map</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]121</div>
122<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]123 <a title="Site Map: Links"href="../www/links.html">Links</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]124</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]125<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]126<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]127 <a title="Sponsors" href="../www/sponsors.html">Sponsors:</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]128
129<div class="sponsbox">
130<div class="sponsor">
cristyefb2bdb2010-11-20 19:35:22 +0000[diff] [blame^]131 <a title="Sponsor: Free Catalogs" href="http://www.who-sells-it.com/">Free Catalogs</a><!-- 20120801000600 -->
cristy7d52cd62010-10-01 17:26:59 +0000[diff] [blame]132</div>
133<div class="sponsor">
134 <a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
cristy73fd1cd2010-09-12 19:14:25 +0000[diff] [blame]135</div>
136<div class="sponsor">
cristyc5baf4f2010-08-31 15:05:33 +0000[diff] [blame]137 <a title="Sponsor: Image Converter" href="http://www.batchphoto.com">Image Converter</a><!-- 201103010900 Bits Coffee-->
138</div>
139<div class="sponsor">
cristy851dbce2010-08-06 21:40:00 +0000[diff] [blame]140 <a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
141</div>
142<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]143 <a title="Sponsor: Webdesign Agentur" href="http://www.ventzke-partner.de">Webdesign Agentur</a><!-- 201101010480 invendio.de-->
cristy69e3f922010-04-10 14:20:03 +0000[diff] [blame]144</div>
145<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]146 <a title="Sponsor: LVM Versicherung" href="http://www.neu-reich.de">LVM Versicherung</a><!-- 201101010480 -->
cristy8f900122010-03-05 15:26:31 +0000[diff] [blame]147</div>
148<div class="sponsor">
cristyc5baf4f2010-08-31 15:05:33 +0000[diff] [blame]149 <a title="Sponsor: Diamonds are a Girls Best Friend" href="http://www.schmuck.org">Diamonds are a Girls Best Friend</a><!-- 201101010600 Peterssen-->
cristyc1c61662009-09-30 14:04:37 +0000[diff] [blame]150</div>
151<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]152 <a title="Sponsor: Druckerei Online" href="http://www.allesdruck.de">Druckerei Online</a><!-- 201012011200 allesdruck.de-->
cristyb4c03bb2009-09-27 13:55:46 +0000[diff] [blame]153</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]154</div>
155</div>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]156</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]157
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]158<div class="eastbar">
159 <script type="text/javascript">
160 <!--
161 google_ad_client = "pub-3129977114552745";
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]162 google_ad_slot = "0574824969";
163 google_ad_width = 160;
164 google_ad_height = 600;
165 //-->
166 </script>
167 <script type="text/javascript"
168 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
169 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]170</div>
171
172<div class="main">
173
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]174<p class="navigation-index"></p>
175
176<p>The <a href="../www/api/MagickCore/index.html">MagickCore API</a> is a low-level interface between the C programming language and the ImageMagick image processing libraries and is recommended for wizard-level programmers only. Unlike the <a href="../www/magick-wand.html">MagickWand</a> C API which uses only a few opaque types and accessors, with MagickCore you almost exlusively access the structure members directly. A description of the MagickCore public methods are found here:</p>
177
178<ul>
179 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
180 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
181 <li><a href="../www/api/composite.html">Composite an Image</a></li>
182 <li><a href="../www/api/image.html">Image Methods</a></li>
183 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]184 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]185 <li><a href="../www/api/distort.html">Image Distortions</a></li>
186 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
187 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
188 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
189 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
190 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
191 <li><a href="../www/api/resize.html">Resize an Image</a></li>
192 <li><a href="../www/api/transform.html">Transform an Image</a></li>
193 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
194 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
195 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]196 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]197 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
198 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]199 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]200 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]201 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
202 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]203 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
204 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
205 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
206 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
207 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
208 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
209 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
210 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
211 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
212 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]213 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]214 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
215 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
216 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
217 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
218 <li><a href="../www/api/module.html">Loadable Modules</a></li>
219 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
220 <li><a href="../www/api/registry.html">The Image Registry</a></li>
221 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
222 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
223 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
224 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
225 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
226 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
227 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
228</ul>
229
230<p>After you write your MagickCore program, compile it like this:</p>
231
cristyd4d64ed2010-08-22 22:19:33 +0000[diff] [blame]232<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>cc `MagickCore-config --cflags --cppflags` -O2 core.c \ <br/> `MagickCore-config --ldflags --libs`</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]233<p>Here is a example program that utilizes the MagickCore API to get you started, <a href="../www/source/core.c">core.c</a>. It reads a GIF image, creates a thumbnail, and writes it to disk in the PNG image format.</p>
234
235<div class="viewport">
236<pre class="code">
237 #include &lt;stdio.h>
238 #include &lt;stdlib.h>
239 #include &lt;string.h>
240 #include &lt;time.h>
241 #include &lt;magick/MagickCore.h>
242
243 int main(int argc,char **argv)
244 {
245 ExceptionInfo
246 *exception;
247
248 Image
249 *image,
250 *images,
251 *resize_image,
252 *thumbnails;
253
254 ImageInfo
255 *image_info;
256
257 if (argc != 3)
258 {
259 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
260 exit(0);
261 }
262 /*
263 Initialize the image info structure and read an image.
264 */
265 MagickCoreGenesis(*argv,MagickTrue);
266 exception=AcquireExceptionInfo();
267 image_info=CloneImageInfo((ImageInfo *) NULL);
268 (void) strcpy(image_info-&gt;filename,argv[1]);
269 images=ReadImage(image_info,exception);
270 if (exception-&gt;severity != UndefinedException)
271 CatchException(exception);
272 if (images == (Image *) NULL)
273 exit(1);
274 /*
275 Convert the image to a thumbnail.
276 */
277 thumbnails=NewImageList();
278 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
279 {
280 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
281 if (resize_image == (Image *) NULL)
282 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
283 (void) AppendImageToList(&amp;thumbnails,resize_image);
284 DestroyImage(image);
285 }
286 /*
287 Write the image thumbnail.
288 */
289 (void) strcpy(thumbnails-&gt;filename,argv[2]);
290 WriteImage(image_info,thumbnails);
291 /*
292 Destroy the image thumbnail and exit.
293 */
294 thumbnails=DestroyImageList(thumbnails);
295 image_info=DestroyImageInfo(image_info);
296 exception=DestroyExceptionInfo(exception);
297 MagickCoreTerminus();
298 return(0);
299 }
300</pre>
301</div>
cristyfbb4a972010-06-30 17:42:22 +0000[diff] [blame]302<p><a name="image-view"></a>Now lets perform the same contrast enhancement while taking advantage of our dual or quad-core processing system by running the algorithm in parallel utilizing wand views. The <a href="../www/source/core/sigmoidal-contrast.c">sigmoidal-contrast.c</a> module reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk just like the previous contrast enhancement program, but now it does its work in parallel (assumes ImageMagick is built with OpenMP support).</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]303
304<div class="viewport">
305<pre class="code">
306#include &lt;stdio.h>
307#include &lt;stdlib.h>
308#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]309#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]310
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]311static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]312 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]313{
314#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
315#define SigmoidalContrast(x) \
316 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
317
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]318 RectangleInfo
319 extent;
320
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]321 register IndexPacket
322 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]323
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]324 register PixelPacket
325 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]326
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]327 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]328 x;
329
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]330 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]331 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]332 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]333 {
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]334 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
335 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
336 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
337 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]338 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]339 indexes=GetImageViewAuthenticIndexes(contrast_view);
340 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]341 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]342 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]343 return(MagickTrue);
344}
345
346int main(int argc,char **argv)
347{
348#define ThrowImageException(image) \
349{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]350 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]351 CatchException(exception); \
352 if (contrast_image != (Image *) NULL) \
353 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]354 exit(-1); \
355}
356#define ThrowViewException(view) \
357{ \
358 char \
359 *description; \
360 \
361 ExceptionType \
362 severity; \
363 \
364 description=GetImageViewException(view,&severity); \
365 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
366 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]367 exit(-1); \
368}
369
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]370 ExceptionInfo
371 *exception;
372
373 Image
374 *contrast_image;
375
376 ImageInfo
377 *image_info;
378
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]379 ImageView
380 *contrast_view;
381
382 MagickBooleanType
383 status;
384
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]385 if (argc != 3)
386 {
387 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
388 exit(0);
389 }
390 /*
391 Read an image.
392 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]393 MagickCoreGenesis(*argv,MagickTrue);
394 image_info=AcquireImageInfo();
395 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
396 exception=AcquireExceptionInfo();
397 contrast_image=ReadImage(image_info,exception);
398 if (contrast_image == (Image *) NULL)
399 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]400 /*
401 Sigmoidal non-linearity contrast control.
402 */
403 contrast_view=NewImageView(contrast_image);
404 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]405 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]406 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
407 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]408 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]409 contrast_view=DestroyImageView(contrast_view);
410 /*
411 Write the image then destroy it.
412 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]413 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]414 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]415 ThrowImageException(contrast_image);
416 contrast_image=DestroyImage(contrast_image);
417 exception=DestroyExceptionInfo(exception);
418 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]419 MagickCoreTerminus();
420 return(0);
421}
422</pre>
423</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]424
425</div>
426
427<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]428 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]429 <span id="linkbar-center">
430 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]431 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]432 </span>
433 <span id="linkbar-east">&nbsp;</span>
434 </div>
435 <div class="footer">
436 <span id="footer-west">&copy; 1999-2010 ImageMagick Studio LLC</span>
437 <span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
438 </div>
439 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]440 <script type="text/javascript">
441 var _gaq = _gaq || [];
442 _gaq.push(['_setAccount', 'UA-17690367-1']);
443 _gaq.push(['_trackPageview']);
444
445 (function() {
446 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
447 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
448 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
449 })();
450 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]451</body>
452</html>