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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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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>
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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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151
152</div>
153
154<div class="main">
155
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]156<p class="navigation-index"></p>
157
158<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>
159
160<ul>
161 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
162 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
163 <li><a href="../www/api/composite.html">Composite an Image</a></li>
164 <li><a href="../www/api/image.html">Image Methods</a></li>
165 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]166 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]167 <li><a href="../www/api/distort.html">Image Distortions</a></li>
168 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
169 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
170 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
171 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
172 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
173 <li><a href="../www/api/resize.html">Resize an Image</a></li>
174 <li><a href="../www/api/transform.html">Transform an Image</a></li>
175 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
176 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
177 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]178 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]179 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
180 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]181 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]182 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]183 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
184 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]185 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
186 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
187 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
188 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
189 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
190 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
191 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
192 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
193 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
194 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame^]195 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
197 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
198 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
199 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
200 <li><a href="../www/api/module.html">Loadable Modules</a></li>
201 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
202 <li><a href="../www/api/registry.html">The Image Registry</a></li>
203 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
204 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
205 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
206 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
207 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
208 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
209 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
210</ul>
211
212<p>After you write your MagickCore program, compile it like this:</p>
213
cristy4949d522010-03-12 18:41:34 +0000[diff] [blame]214<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]215<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>
216
217<div class="viewport">
218<pre class="code">
219 #include &lt;stdio.h>
220 #include &lt;stdlib.h>
221 #include &lt;string.h>
222 #include &lt;time.h>
223 #include &lt;magick/MagickCore.h>
224
225 int main(int argc,char **argv)
226 {
227 ExceptionInfo
228 *exception;
229
230 Image
231 *image,
232 *images,
233 *resize_image,
234 *thumbnails;
235
236 ImageInfo
237 *image_info;
238
239 if (argc != 3)
240 {
241 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
242 exit(0);
243 }
244 /*
245 Initialize the image info structure and read an image.
246 */
247 MagickCoreGenesis(*argv,MagickTrue);
248 exception=AcquireExceptionInfo();
249 image_info=CloneImageInfo((ImageInfo *) NULL);
250 (void) strcpy(image_info-&gt;filename,argv[1]);
251 images=ReadImage(image_info,exception);
252 if (exception-&gt;severity != UndefinedException)
253 CatchException(exception);
254 if (images == (Image *) NULL)
255 exit(1);
256 /*
257 Convert the image to a thumbnail.
258 */
259 thumbnails=NewImageList();
260 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
261 {
262 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
263 if (resize_image == (Image *) NULL)
264 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
265 (void) AppendImageToList(&amp;thumbnails,resize_image);
266 DestroyImage(image);
267 }
268 /*
269 Write the image thumbnail.
270 */
271 (void) strcpy(thumbnails-&gt;filename,argv[2]);
272 WriteImage(image_info,thumbnails);
273 /*
274 Destroy the image thumbnail and exit.
275 */
276 thumbnails=DestroyImageList(thumbnails);
277 image_info=DestroyImageInfo(image_info);
278 exception=DestroyExceptionInfo(exception);
279 MagickCoreTerminus();
280 return(0);
281 }
282</pre>
283</div>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame^]284<p>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/image-contrast.c">image-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>
285
286<div class="viewport">
287<pre class="code">
288#include &lt;stdio.h>
289#include &lt;stdlib.h>
290#include &lt;math.h>
291#include &lt;wand/MagickCore.h>
292
293static MagickBooleanType SigmoidalContrast(ImageView *pixel_view,
294 void *context)
295{
296#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
297#define SigmoidalContrast(x) \
298 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
299
300 MagickPixelPacket
301 pixel;
302
303 PixelWand
304 **pixels;
305
306 register long
307 x;
308
309 pixels=GetImageViewPixels(contrast_view);
310 for (x=0; x &lt; (long) GetImageViewWidth(contrast_view); x++)
311 {
312 PixelGetMagickColor(pixels[x],&amp;pixel);
313 pixel.red=SigmoidalContrast(pixel.red);
314 pixel.green=SigmoidalContrast(pixel.green);
315 pixel.blue=SigmoidalContrast(pixel.blue);
316 pixel.index=SigmoidalContrast(pixel.index);
317 PixelSetMagickColor(contrast_pixels[x],&amp;pixel);
318 }
319 return(MagickTrue);
320}
321
322int main(int argc,char **argv)
323{
324#define ThrowImageException(image) \
325{ \
326 char \
327 *description; \
328 \
329 ExceptionType \
330 severity; \
331 \
332 description=GetImageException(image,&amp;severity); \
333 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
334 description=(char *) MagickRelinquishMemory(description); \
335 exit(-1); \
336}
337
338 ImageView
339 *contrast_view;
340
341 MagickBooleanType
342 status;
343
344 MagickPixelPacket
345 pixel;
346
347 MagickWand
348 *contrast_image;
349
350 if (argc != 3)
351 {
352 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
353 exit(0);
354 }
355 /*
356 Read an image.
357 */
358 MagickCoreGenesis();
359 contrast_image=NewMagickWand();
360 status=MagickReadImage(contrast_image,argv[1]);
361 if (status == MagickFalse)
362 ThrowWandException(contrast_image);
363 /*
364 Sigmoidal non-linearity contrast control.
365 */
366 contrast_view=NewImageView(contrast_image);
367 if (contrast_view == (ImageView *) NULL)
368 ThrowWandException(contrast_image);
369 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
370 if (status == MagickFalse)
371 ThrowWandException(contrast_image);
372 contrast_view=DestroyImageView(contrast_view);
373 /*
374 Write the image then destroy it.
375 */
376 status=kWriteImages(contrast_image,argv[2],MagickTrue);
377 if (status == MagickFalse)
378 ThrowWandException(contrast_image);
379 contrast_image=DestroyMagickWand(contrast_image);
380 MagickCoreTerminus();
381 return(0);
382}
383</pre>
384</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]385
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