Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / a890294753108889ed477181e5dd0ff5fc605f43 / . / www / magick-core.html
blob: 9dfdddd0d689b9e0714ea31f144a6ec272b07a05 [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>
cristy3de29cc2010-04-15 02:34:44 +0000[diff] [blame]6 <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]7 <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U=" />
8 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf" />
cristy3de29cc2010-04-15 02:34:44 +0000[diff] [blame]9 <style type="text/css" media="all">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]10 @import url("../www/magick.css");
cristy3de29cc2010-04-15 02:34:44 +0000[diff] [blame]11 </style>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]12 <link rel="shortcut icon" href="../images/wand.ico" type="images/vnd.microsoft.icon"/>
13 <title>ImageMagick: MagickCore, Low-level C API for ImageMagick</title>
14 <meta http-equiv="Content-Language" content="en-US"/>
15 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
16 <meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
17 <meta name="Generator" content="PHP"/>
18 <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"/>
19 <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."/>
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"/>
cristy16af1cb2009-12-11 21:38:29 +0000[diff] [blame]26 <meta name="Copyright" content="Copyright (c) 1999-2010 ImageMagick Studio LLC"/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]27 <meta name="Distribution" content="Global"/>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]28</head>
29
30<body id="www-imagemagick-org">
31<div class="titlebar">
32<a href="../index.html">
33 <img src="../images/script.png" alt="[ImageMagick]"
34 style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
35<a href="http://www.networkredux.com">
36 <img src="../images/networkredux.png" alt="[sponsor]"
37 style="margin: 45px auto; border: 0px; float: left;" /></a>
38<a href="http://www.imagemagick.org/discourse-server/">
39 <img src="../images/logo.jpg" alt=""
40 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
41<a href="../index.html">
42 <img src="../images/sprite.jpg" alt=""
43 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
44</div>
45
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]46<div class="westbar">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]47
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]48<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]49 <a title="About ImageMagick" href="../index.html">About ImageMagick</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]50</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]51<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]52<div class="menu">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]53 <a title="Binary Releases" href="../www/binary-releases.html">Binary Releases</a>
54</div>
55<div class="sub">
56 <a title="Binary Release: Unix" href="../www/binary-releases.html#unix">Unix</a>
57</div>
58<div class="sub">
59 <a title="Binary Release: MacOS X" href="../www/binary-releases.html#macosx">Mac OS X</a>
60</div>
61<div class="sub">
62 <a title="Binary Release: Windows" href="../www/binary-releases.html#windows">Windows</a>
63</div>
64<div class="sep"></div>
65<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]66 <a title="Command-line Tools" href="../www/command-line-tools.html">Command-line Tools</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]67</div>
68<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]69 <a title="Command-line Tools: Processing" href="../www/command-line-processing.html">Processing</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: Options" href="../www/command-line-options.html">Options</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: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]76</div>
77<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]78 <a title="Program Interfaces" href="../www/api.html">Program Interfaces</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]79</div>
80<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]81 <a title="Program Interface: MagickWand" href="../www/magick-wand.html">MagickWand</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: MagickCore" href="../www/magick-core.html">MagickCore</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: PerlMagick" href="../www/perl-magick.html">PerlMagick</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: Magick++" href="../Magick++/">Magick++</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]91</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]92<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]93<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]94 <a title="Install from Source" href="../www/install-source.html">Install from Source</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]95</div>
96<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]97 <a title="Install from Source: Unix" href="../www/install-source.html#unix">Unix</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: Windows" href="../www/install-source.html#windows">Windows</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]101 </div>
102<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]103 <a title="Resources" href="../www/resources.html">Resources</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]104</div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]105<div class="menu">
106 <a title="Architecture" href="../www/architecture.html">Architecture</a>
107</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]108<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]109 <a title="Download" href="../www/download.html">Download</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]110</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]111<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]112<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]113 <a title="Search" href="http://www.imagemagick.org/script/search.php">Search</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]114</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]115<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]116<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]117 <a title="Site Map"href="../www/sitemap.html">Site Map</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]118</div>
119<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]120 <a title="Site Map: Links"href="../www/links.html">Links</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]121</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]122<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]123<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]124 <a title="Sponsors" href="../www/sponsors.html">Sponsors:</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]125
126<div class="sponsbox">
127<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]128 <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]129</div>
130<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]131 <a title="Sponsor: LVM Versicherung" href="http://www.neu-reich.de">LVM Versicherung</a><!-- 201101010480 -->
cristy8f900122010-03-05 15:26:31 +0000[diff] [blame]132</div>
133<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]134 <a title="Sponsor: Deko.net" href="http://www.deko.net">Deko.net</a><!-- 201101010600 Peterssen-->
cristy1f9e1ed2009-11-18 04:09:38 +0000[diff] [blame]135</div>
136<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]137 <a title="Sponsor: Druckerei" href="http://www.print24.de/">Druckerei</a><!-- 201009010720 -->
cristyc1c61662009-09-30 14:04:37 +0000[diff] [blame]138</div>
139<div class="sponsor">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]140 <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]141</div>
cristyf0d1f5d2010-05-13 16:29:38 +0000[diff] [blame]142<div class="sponsor">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]143 <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]144</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]145</div>
146</div>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]147</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]148
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]149<div class="eastbar">
150 <script type="text/javascript">
151 <!--
152 google_ad_client = "pub-3129977114552745";
153 /* 160x600, created 7/27/10 */
154 google_ad_slot = "0574824969";
155 google_ad_width = 160;
156 google_ad_height = 600;
157 //-->
158 </script>
159 <script type="text/javascript"
160 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
161 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]162</div>
163
164<div class="main">
165
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]166<p class="navigation-index"></p>
167
168<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>
169
170<ul>
171 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
172 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
173 <li><a href="../www/api/composite.html">Composite an Image</a></li>
174 <li><a href="../www/api/image.html">Image Methods</a></li>
175 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]176 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]177 <li><a href="../www/api/distort.html">Image Distortions</a></li>
178 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
179 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
180 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
181 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
182 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
183 <li><a href="../www/api/resize.html">Resize an Image</a></li>
184 <li><a href="../www/api/transform.html">Transform an Image</a></li>
185 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
186 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
187 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]188 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]189 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
190 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]191 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]192 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]193 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
194 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]195 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
196 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
197 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
198 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
199 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
200 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
201 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
202 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
203 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
204 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]205 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]206 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
207 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
208 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
209 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
210 <li><a href="../www/api/module.html">Loadable Modules</a></li>
211 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
212 <li><a href="../www/api/registry.html">The Image Registry</a></li>
213 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
214 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
215 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
216 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
217 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
218 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
219 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
220</ul>
221
222<p>After you write your MagickCore program, compile it like this:</p>
223
cristy4949d522010-03-12 18:41:34 +0000[diff] [blame]224<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]225<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>
226
227<div class="viewport">
228<pre class="code">
229 #include &lt;stdio.h>
230 #include &lt;stdlib.h>
231 #include &lt;string.h>
232 #include &lt;time.h>
233 #include &lt;magick/MagickCore.h>
234
235 int main(int argc,char **argv)
236 {
237 ExceptionInfo
238 *exception;
239
240 Image
241 *image,
242 *images,
243 *resize_image,
244 *thumbnails;
245
246 ImageInfo
247 *image_info;
248
249 if (argc != 3)
250 {
251 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
252 exit(0);
253 }
254 /*
255 Initialize the image info structure and read an image.
256 */
257 MagickCoreGenesis(*argv,MagickTrue);
258 exception=AcquireExceptionInfo();
259 image_info=CloneImageInfo((ImageInfo *) NULL);
260 (void) strcpy(image_info-&gt;filename,argv[1]);
261 images=ReadImage(image_info,exception);
262 if (exception-&gt;severity != UndefinedException)
263 CatchException(exception);
264 if (images == (Image *) NULL)
265 exit(1);
266 /*
267 Convert the image to a thumbnail.
268 */
269 thumbnails=NewImageList();
270 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
271 {
272 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
273 if (resize_image == (Image *) NULL)
274 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
275 (void) AppendImageToList(&amp;thumbnails,resize_image);
276 DestroyImage(image);
277 }
278 /*
279 Write the image thumbnail.
280 */
281 (void) strcpy(thumbnails-&gt;filename,argv[2]);
282 WriteImage(image_info,thumbnails);
283 /*
284 Destroy the image thumbnail and exit.
285 */
286 thumbnails=DestroyImageList(thumbnails);
287 image_info=DestroyImageInfo(image_info);
288 exception=DestroyExceptionInfo(exception);
289 MagickCoreTerminus();
290 return(0);
291 }
292</pre>
293</div>
cristyfbb4a972010-06-30 17:42:22 +0000[diff] [blame]294<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]295
296<div class="viewport">
297<pre class="code">
298#include &lt;stdio.h>
299#include &lt;stdlib.h>
300#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]301#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]302
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]303static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]304 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]305{
306#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
307#define SigmoidalContrast(x) \
308 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
309
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]310 RectangleInfo
311 extent;
312
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]313 register IndexPacket
314 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]315
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]316 register PixelPacket
317 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]318
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]319 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]320 x;
321
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]322 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]323 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]324 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]325 {
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]326 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
327 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
328 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
329 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]330 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]331 indexes=GetImageViewAuthenticIndexes(contrast_view);
332 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]333 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]334 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]335 return(MagickTrue);
336}
337
338int main(int argc,char **argv)
339{
340#define ThrowImageException(image) \
341{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]342 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]343 CatchException(exception); \
344 if (contrast_image != (Image *) NULL) \
345 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]346 exit(-1); \
347}
348#define ThrowViewException(view) \
349{ \
350 char \
351 *description; \
352 \
353 ExceptionType \
354 severity; \
355 \
356 description=GetImageViewException(view,&severity); \
357 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
358 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]359 exit(-1); \
360}
361
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]362 ExceptionInfo
363 *exception;
364
365 Image
366 *contrast_image;
367
368 ImageInfo
369 *image_info;
370
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]371 ImageView
372 *contrast_view;
373
374 MagickBooleanType
375 status;
376
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]377 if (argc != 3)
378 {
379 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
380 exit(0);
381 }
382 /*
383 Read an image.
384 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]385 MagickCoreGenesis(*argv,MagickTrue);
386 image_info=AcquireImageInfo();
387 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
388 exception=AcquireExceptionInfo();
389 contrast_image=ReadImage(image_info,exception);
390 if (contrast_image == (Image *) NULL)
391 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]392 /*
393 Sigmoidal non-linearity contrast control.
394 */
395 contrast_view=NewImageView(contrast_image);
396 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]397 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]398 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
399 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]400 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]401 contrast_view=DestroyImageView(contrast_view);
402 /*
403 Write the image then destroy it.
404 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]405 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]406 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]407 ThrowImageException(contrast_image);
408 contrast_image=DestroyImage(contrast_image);
409 exception=DestroyExceptionInfo(exception);
410 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]411 MagickCoreTerminus();
412 return(0);
413}
414</pre>
415</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]416
417</div>
418
419<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]420 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]421 <span id="linkbar-center">
422 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame^]423 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]424 </span>
425 <span id="linkbar-east">&nbsp;</span>
426 </div>
427 <div class="footer">
428 <span id="footer-west">&copy; 1999-2010 ImageMagick Studio LLC</span>
429 <span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
430 </div>
431 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame^]432 <script type="text/javascript">
433 var _gaq = _gaq || [];
434 _gaq.push(['_setAccount', 'UA-17690367-1']);
435 _gaq.push(['_trackPageview']);
436
437 (function() {
438 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
439 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
440 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
441 })();
442 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]443</body>
444</html>