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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">
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8 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf" />
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]10 @import url("../www/magick.css");
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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"/>
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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."/>
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149</div>
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165
166<div class="main">
167
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]168<p class="navigation-index"></p>
169
170<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>
171
172<ul>
173 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
174 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
175 <li><a href="../www/api/composite.html">Composite an Image</a></li>
176 <li><a href="../www/api/image.html">Image Methods</a></li>
177 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]178 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]179 <li><a href="../www/api/distort.html">Image Distortions</a></li>
180 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
181 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
182 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
183 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
184 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
185 <li><a href="../www/api/resize.html">Resize an Image</a></li>
186 <li><a href="../www/api/transform.html">Transform an Image</a></li>
187 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
188 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
189 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]190 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]191 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
192 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]193 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]194 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]195 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
196 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]197 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
198 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
199 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
200 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
201 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
202 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
203 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
204 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
205 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
206 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]207 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
209 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
210 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
211 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
212 <li><a href="../www/api/module.html">Loadable Modules</a></li>
213 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
214 <li><a href="../www/api/registry.html">The Image Registry</a></li>
215 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
216 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
217 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
218 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
219 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
220 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
221 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
222</ul>
223
224<p>After you write your MagickCore program, compile it like this:</p>
225
cristy4949d522010-03-12 18:41:34 +0000[diff] [blame]226<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]227<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>
228
229<div class="viewport">
230<pre class="code">
231 #include &lt;stdio.h>
232 #include &lt;stdlib.h>
233 #include &lt;string.h>
234 #include &lt;time.h>
235 #include &lt;magick/MagickCore.h>
236
237 int main(int argc,char **argv)
238 {
239 ExceptionInfo
240 *exception;
241
242 Image
243 *image,
244 *images,
245 *resize_image,
246 *thumbnails;
247
248 ImageInfo
249 *image_info;
250
251 if (argc != 3)
252 {
253 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
254 exit(0);
255 }
256 /*
257 Initialize the image info structure and read an image.
258 */
259 MagickCoreGenesis(*argv,MagickTrue);
260 exception=AcquireExceptionInfo();
261 image_info=CloneImageInfo((ImageInfo *) NULL);
262 (void) strcpy(image_info-&gt;filename,argv[1]);
263 images=ReadImage(image_info,exception);
264 if (exception-&gt;severity != UndefinedException)
265 CatchException(exception);
266 if (images == (Image *) NULL)
267 exit(1);
268 /*
269 Convert the image to a thumbnail.
270 */
271 thumbnails=NewImageList();
272 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
273 {
274 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
275 if (resize_image == (Image *) NULL)
276 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
277 (void) AppendImageToList(&amp;thumbnails,resize_image);
278 DestroyImage(image);
279 }
280 /*
281 Write the image thumbnail.
282 */
283 (void) strcpy(thumbnails-&gt;filename,argv[2]);
284 WriteImage(image_info,thumbnails);
285 /*
286 Destroy the image thumbnail and exit.
287 */
288 thumbnails=DestroyImageList(thumbnails);
289 image_info=DestroyImageInfo(image_info);
290 exception=DestroyExceptionInfo(exception);
291 MagickCoreTerminus();
292 return(0);
293 }
294</pre>
295</div>
cristyfbb4a972010-06-30 17:42:22 +0000[diff] [blame]296<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]297
298<div class="viewport">
299<pre class="code">
300#include &lt;stdio.h>
301#include &lt;stdlib.h>
302#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]303#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]304
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]305static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]306 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]307{
308#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
309#define SigmoidalContrast(x) \
310 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
311
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]312 RectangleInfo
313 extent;
314
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]315 register IndexPacket
316 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]317
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]318 register PixelPacket
319 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]320
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]321 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]322 x;
323
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]324 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]325 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]326 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]327 {
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]328 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
329 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
330 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
331 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]332 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]333 indexes=GetImageViewAuthenticIndexes(contrast_view);
334 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]335 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]336 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]337 return(MagickTrue);
338}
339
340int main(int argc,char **argv)
341{
342#define ThrowImageException(image) \
343{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]344 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]345 CatchException(exception); \
346 if (contrast_image != (Image *) NULL) \
347 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]348 exit(-1); \
349}
350#define ThrowViewException(view) \
351{ \
352 char \
353 *description; \
354 \
355 ExceptionType \
356 severity; \
357 \
358 description=GetImageViewException(view,&severity); \
359 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
360 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]361 exit(-1); \
362}
363
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]364 ExceptionInfo
365 *exception;
366
367 Image
368 *contrast_image;
369
370 ImageInfo
371 *image_info;
372
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]373 ImageView
374 *contrast_view;
375
376 MagickBooleanType
377 status;
378
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]379 if (argc != 3)
380 {
381 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
382 exit(0);
383 }
384 /*
385 Read an image.
386 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]387 MagickCoreGenesis(*argv,MagickTrue);
388 image_info=AcquireImageInfo();
389 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
390 exception=AcquireExceptionInfo();
391 contrast_image=ReadImage(image_info,exception);
392 if (contrast_image == (Image *) NULL)
393 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]394 /*
395 Sigmoidal non-linearity contrast control.
396 */
397 contrast_view=NewImageView(contrast_image);
398 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]399 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]400 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
401 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]402 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]403 contrast_view=DestroyImageView(contrast_view);
404 /*
405 Write the image then destroy it.
406 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]407 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]408 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]409 ThrowImageException(contrast_image);
410 contrast_image=DestroyImage(contrast_image);
411 exception=DestroyExceptionInfo(exception);
412 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]413 MagickCoreTerminus();
414 return(0);
415}
416</pre>
417</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]418
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