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cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
3 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
cristy2bd2a982011-02-15 00:52:58 +0000[diff] [blame]4<html version="-//W3C//DTD XHTML 1.1//EN"
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]12 <title>ImageMagick: MagickCore, Low-level C API for ImageMagick</title>
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cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]17 <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."/>
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cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]29 <link rel="icon" href="../images/wand.png"/>
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31 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
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cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]33 <style type="text/css" media="all">
34 @import url("../www/magick.css");
35 </style>
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cristy361f4662010-12-31 23:02:52 +0000[diff] [blame]37 <script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]49</head>
50
51<body id="www-imagemagick-org">
52<div class="titlebar">
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54 <script type="text/javascript">
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68 alt="ImageMagick Logo"
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72 alt="ImageMagick Sprite"
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74</div>
75
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]76<div class="westbar">
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113<div class="sub">
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116<div class="sub">
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119<div class="sub">
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191</div>
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197
198<div class="main">
199
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]200<h1>MagickCore C API</h1>
201
202<div class="doc-section">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]203
204<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>
205
206<ul>
207 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
208 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
209 <li><a href="../www/api/composite.html">Composite an Image</a></li>
210 <li><a href="../www/api/image.html">Image Methods</a></li>
211 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]212 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]213 <li><a href="../www/api/distort.html">Image Distortions</a></li>
214 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
215 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
216 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
217 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
218 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
219 <li><a href="../www/api/resize.html">Resize an Image</a></li>
220 <li><a href="../www/api/transform.html">Transform an Image</a></li>
221 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
222 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
223 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]224 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
226 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]227 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]228 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]229 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
230 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]231 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
232 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
233 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
234 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
235 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
236 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
237 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
238 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
239 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
240 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]241 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]242 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
243 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
244 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
245 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
246 <li><a href="../www/api/module.html">Loadable Modules</a></li>
247 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
248 <li><a href="../www/api/registry.html">The Image Registry</a></li>
249 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
250 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
251 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
252 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
253 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
254 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
255 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
256</ul>
257
258<p>After you write your MagickCore program, compile it like this:</p>
259
cristyd4d64ed2010-08-22 22:19:33 +0000[diff] [blame]260<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]261<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>
262
263<div class="viewport">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]264 #include &lt;stdio.h>
265 #include &lt;stdlib.h>
266 #include &lt;string.h>
267 #include &lt;time.h>
268 #include &lt;magick/MagickCore.h>
269
270 int main(int argc,char **argv)
271 {
272 ExceptionInfo
273 *exception;
274
275 Image
276 *image,
277 *images,
278 *resize_image,
279 *thumbnails;
280
281 ImageInfo
282 *image_info;
283
284 if (argc != 3)
285 {
286 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
287 exit(0);
288 }
289 /*
290 Initialize the image info structure and read an image.
291 */
292 MagickCoreGenesis(*argv,MagickTrue);
293 exception=AcquireExceptionInfo();
294 image_info=CloneImageInfo((ImageInfo *) NULL);
295 (void) strcpy(image_info-&gt;filename,argv[1]);
296 images=ReadImage(image_info,exception);
297 if (exception-&gt;severity != UndefinedException)
298 CatchException(exception);
299 if (images == (Image *) NULL)
300 exit(1);
301 /*
302 Convert the image to a thumbnail.
303 */
304 thumbnails=NewImageList();
305 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
306 {
307 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
308 if (resize_image == (Image *) NULL)
309 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
310 (void) AppendImageToList(&amp;thumbnails,resize_image);
311 DestroyImage(image);
312 }
313 /*
314 Write the image thumbnail.
315 */
316 (void) strcpy(thumbnails-&gt;filename,argv[2]);
317 WriteImage(image_info,thumbnails);
318 /*
319 Destroy the image thumbnail and exit.
320 */
321 thumbnails=DestroyImageList(thumbnails);
322 image_info=DestroyImageInfo(image_info);
323 exception=DestroyExceptionInfo(exception);
324 MagickCoreTerminus();
325 return(0);
326 }
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]327</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]328<p><a id="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]329
330<div class="viewport">
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]331#include &lt;stdio.h>
332#include &lt;stdlib.h>
333#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]334#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]335
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]336static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]337 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]338{
339#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
340#define SigmoidalContrast(x) \
341 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
342
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]343 RectangleInfo
344 extent;
345
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]346 register IndexPacket
347 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]348
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]349 register PixelPacket
350 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]351
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]352 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]353 x;
354
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]355 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]356 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]357 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]358 {
cristyacc04882011-05-04 23:03:43 +0000[diff] [blame]359 SetRedPixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
360 GetRedPixelComponent(pixels)));
361 SetGreenPixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
362 GetGreenPixelComponent(pixels)));
363 SetBluePixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
364 GetBluePixelComponent(pixels)));
365 SetOpacityPixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
366 GetOpacityPixelComponent(pixels)));
367 pixels++;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]368 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]369 indexes=GetImageViewAuthenticIndexes(contrast_view);
370 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]371 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristyacc04882011-05-04 23:03:43 +0000[diff] [blame]372 SetIndexPixelComponent(indexes+x,RoundToQuantum(SigmoidalContrast(
373 GetIndexPixelComponent(indexes+x))));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]374 return(MagickTrue);
375}
376
377int main(int argc,char **argv)
378{
379#define ThrowImageException(image) \
380{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]381 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]382 CatchException(exception); \
383 if (contrast_image != (Image *) NULL) \
384 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]385 exit(-1); \
386}
387#define ThrowViewException(view) \
388{ \
389 char \
390 *description; \
391 \
392 ExceptionType \
393 severity; \
394 \
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]395 description=GetImageViewException(view,&amp;severity); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]396 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
397 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]398 exit(-1); \
399}
400
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]401 ExceptionInfo
402 *exception;
403
404 Image
405 *contrast_image;
406
407 ImageInfo
408 *image_info;
409
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]410 ImageView
411 *contrast_view;
412
413 MagickBooleanType
414 status;
415
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]416 if (argc != 3)
417 {
418 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
419 exit(0);
420 }
421 /*
422 Read an image.
423 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]424 MagickCoreGenesis(*argv,MagickTrue);
425 image_info=AcquireImageInfo();
426 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
427 exception=AcquireExceptionInfo();
428 contrast_image=ReadImage(image_info,exception);
429 if (contrast_image == (Image *) NULL)
430 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]431 /*
432 Sigmoidal non-linearity contrast control.
433 */
434 contrast_view=NewImageView(contrast_image);
435 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]436 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]437 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
438 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]439 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]440 contrast_view=DestroyImageView(contrast_view);
441 /*
442 Write the image then destroy it.
443 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]444 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]445 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]446 ThrowImageException(contrast_image);
447 contrast_image=DestroyImage(contrast_image);
448 exception=DestroyExceptionInfo(exception);
449 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]450 MagickCoreTerminus();
451 return(0);
452}
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]453</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]454</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]455
456</div>
457
458<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]459 <span id="linkbar-west">&nbsp;</span>
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461 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]462 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]463 </span>
464 <span id="linkbar-east">&nbsp;</span>
465 </div>
466 <div class="footer">
cristy7e41fe82010-12-04 23:12:08 +0000[diff] [blame]467 <span id="footer-west">&copy; 1999-2011 ImageMagick Studio LLC</span>
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