Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / 3c98a4f16d52dec9efa9a9b4e36b5624138b324a / . / www / magick-core.html
blob: 95ba0e50620d94d0a3a736699989fa39942e590b [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">
cristy851dbce2010-08-06 21:40:00 +0000[diff] [blame]131 <a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
132</div>
133<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]134 <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]135</div>
136<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]137 <a title="Sponsor: LVM Versicherung" href="http://www.neu-reich.de">LVM Versicherung</a><!-- 201101010480 -->
cristy8f900122010-03-05 15:26:31 +0000[diff] [blame]138</div>
139<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]140 <a title="Sponsor: Deko.net" href="http://www.deko.net">Deko.net</a><!-- 201101010600 Peterssen-->
cristy1f9e1ed2009-11-18 04:09:38 +0000[diff] [blame]141</div>
142<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]143 <a title="Sponsor: Druckerei" href="http://www.print24.de/">Druckerei</a><!-- 201009010720 -->
cristyc1c61662009-09-30 14:04:37 +0000[diff] [blame]144</div>
145<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]146 <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]147</div>
cristyf0d1f5d2010-05-13 16:29:38 +0000[diff] [blame]148<div class="sponsor">
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame^]149 <a title="Sponsor: Free Catalogs" href="http://www.who-sells-it.com/">Free Catalogs</a><!-- 20120801000600 -->
cristyf0d1f5d2010-05-13 16:29:38 +0000[diff] [blame]150</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]151</div>
152</div>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]153</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]154
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]155<div class="eastbar">
156 <script type="text/javascript">
157 <!--
158 google_ad_client = "pub-3129977114552745";
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]159 google_ad_slot = "0574824969";
160 google_ad_width = 160;
161 google_ad_height = 600;
162 //-->
163 </script>
164 <script type="text/javascript"
165 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
166 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]167</div>
168
169<div class="main">
170
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]171<p class="navigation-index"></p>
172
173<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>
174
175<ul>
176 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
177 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
178 <li><a href="../www/api/composite.html">Composite an Image</a></li>
179 <li><a href="../www/api/image.html">Image Methods</a></li>
180 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]181 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]182 <li><a href="../www/api/distort.html">Image Distortions</a></li>
183 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
184 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
185 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
186 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
187 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
188 <li><a href="../www/api/resize.html">Resize an Image</a></li>
189 <li><a href="../www/api/transform.html">Transform an Image</a></li>
190 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
191 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
192 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]193 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]194 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
195 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]196 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]197 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]198 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
199 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]200 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
201 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
202 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
203 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
204 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
205 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
206 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
207 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
208 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
209 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]210 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]211 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
212 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
213 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
214 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
215 <li><a href="../www/api/module.html">Loadable Modules</a></li>
216 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
217 <li><a href="../www/api/registry.html">The Image Registry</a></li>
218 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
219 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
220 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
221 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
222 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
223 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
224 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
225</ul>
226
227<p>After you write your MagickCore program, compile it like this:</p>
228
cristy4949d522010-03-12 18:41:34 +0000[diff] [blame]229<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>cc `MagickCore-config --cflags --cppflags` core.c \ <br/> `MagickCore-config --ldflags --libs`</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]230<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>
231
232<div class="viewport">
233<pre class="code">
234 #include &lt;stdio.h>
235 #include &lt;stdlib.h>
236 #include &lt;string.h>
237 #include &lt;time.h>
238 #include &lt;magick/MagickCore.h>
239
240 int main(int argc,char **argv)
241 {
242 ExceptionInfo
243 *exception;
244
245 Image
246 *image,
247 *images,
248 *resize_image,
249 *thumbnails;
250
251 ImageInfo
252 *image_info;
253
254 if (argc != 3)
255 {
256 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
257 exit(0);
258 }
259 /*
260 Initialize the image info structure and read an image.
261 */
262 MagickCoreGenesis(*argv,MagickTrue);
263 exception=AcquireExceptionInfo();
264 image_info=CloneImageInfo((ImageInfo *) NULL);
265 (void) strcpy(image_info-&gt;filename,argv[1]);
266 images=ReadImage(image_info,exception);
267 if (exception-&gt;severity != UndefinedException)
268 CatchException(exception);
269 if (images == (Image *) NULL)
270 exit(1);
271 /*
272 Convert the image to a thumbnail.
273 */
274 thumbnails=NewImageList();
275 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
276 {
277 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
278 if (resize_image == (Image *) NULL)
279 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
280 (void) AppendImageToList(&amp;thumbnails,resize_image);
281 DestroyImage(image);
282 }
283 /*
284 Write the image thumbnail.
285 */
286 (void) strcpy(thumbnails-&gt;filename,argv[2]);
287 WriteImage(image_info,thumbnails);
288 /*
289 Destroy the image thumbnail and exit.
290 */
291 thumbnails=DestroyImageList(thumbnails);
292 image_info=DestroyImageInfo(image_info);
293 exception=DestroyExceptionInfo(exception);
294 MagickCoreTerminus();
295 return(0);
296 }
297</pre>
298</div>
cristyfbb4a972010-06-30 17:42:22 +0000[diff] [blame]299<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]300
301<div class="viewport">
302<pre class="code">
303#include &lt;stdio.h>
304#include &lt;stdlib.h>
305#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]306#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]307
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]308static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]309 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]310{
311#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
312#define SigmoidalContrast(x) \
313 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
314
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]315 RectangleInfo
316 extent;
317
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]318 register IndexPacket
319 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]320
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]321 register PixelPacket
322 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]323
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]324 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]325 x;
326
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]327 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]328 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]329 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]330 {
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]331 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
332 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
333 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
334 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]335 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]336 indexes=GetImageViewAuthenticIndexes(contrast_view);
337 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]338 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]339 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]340 return(MagickTrue);
341}
342
343int main(int argc,char **argv)
344{
345#define ThrowImageException(image) \
346{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]347 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]348 CatchException(exception); \
349 if (contrast_image != (Image *) NULL) \
350 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]351 exit(-1); \
352}
353#define ThrowViewException(view) \
354{ \
355 char \
356 *description; \
357 \
358 ExceptionType \
359 severity; \
360 \
361 description=GetImageViewException(view,&severity); \
362 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
363 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]364 exit(-1); \
365}
366
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]367 ExceptionInfo
368 *exception;
369
370 Image
371 *contrast_image;
372
373 ImageInfo
374 *image_info;
375
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]376 ImageView
377 *contrast_view;
378
379 MagickBooleanType
380 status;
381
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]382 if (argc != 3)
383 {
384 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
385 exit(0);
386 }
387 /*
388 Read an image.
389 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]390 MagickCoreGenesis(*argv,MagickTrue);
391 image_info=AcquireImageInfo();
392 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
393 exception=AcquireExceptionInfo();
394 contrast_image=ReadImage(image_info,exception);
395 if (contrast_image == (Image *) NULL)
396 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]397 /*
398 Sigmoidal non-linearity contrast control.
399 */
400 contrast_view=NewImageView(contrast_image);
401 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]402 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]403 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
404 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]405 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]406 contrast_view=DestroyImageView(contrast_view);
407 /*
408 Write the image then destroy it.
409 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]410 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]411 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]412 ThrowImageException(contrast_image);
413 contrast_image=DestroyImage(contrast_image);
414 exception=DestroyExceptionInfo(exception);
415 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]416 MagickCoreTerminus();
417 return(0);
418}
419</pre>
420</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]421
422</div>
423
424<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]425 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]426 <span id="linkbar-center">
427 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]428 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]429 </span>
430 <span id="linkbar-east">&nbsp;</span>
431 </div>
432 <div class="footer">
433 <span id="footer-west">&copy; 1999-2010 ImageMagick Studio LLC</span>
434 <span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
435 </div>
436 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]437 <script type="text/javascript">
438 var _gaq = _gaq || [];
439 _gaq.push(['_setAccount', 'UA-17690367-1']);
440 _gaq.push(['_trackPageview']);
441
442 (function() {
443 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
444 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
445 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
446 })();
447 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]448</body>
449</html>