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215 <h1>MagickCore C API</h1>
217 <div class="doc-section">
219 <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>
222 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
223 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
224 <li><a href="../www/api/composite.html">Composite an Image</a></li>
225 <li><a href="../www/api/image.html">Image Methods</a></li>
226 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
227 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
228 <li><a href="../www/api/distort.html">Image Distortions</a></li>
229 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
230 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
231 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
232 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
233 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
234 <li><a href="../www/api/resize.html">Resize an Image</a></li>
235 <li><a href="../www/api/transform.html">Transform an Image</a></li>
236 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
237 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
238 <li><a href="../www/api/effect.html">Add an Effect</a></li>
239 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
240 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
241 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
242 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
243 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
244 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
245 <li><a href="../www/api/feature.html">Get Image Features</a></li>
246 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
247 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
248 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
249 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
250 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
251 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
252 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
253 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
254 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
255 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
256 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
257 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
258 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
259 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
260 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
261 <li><a href="../www/api/module.html">Loadable Modules</a></li>
262 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
263 <li><a href="../www/api/registry.html">The Image Registry</a></li>
264 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
265 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
266 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
267 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
268 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
269 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
270 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
273 <p>After you write your MagickCore program, compile it like this:</p>
275 <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>cc `MagickCore-config --cflags --cppflags` -O2 core.c \ <br/> `MagickCore-config --ldflags --libs`</span></p>
276 <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>
278 <div class="viewport">
279 #include <stdio.h>
280 #include <stdlib.h>
281 #include <string.h>
283 #include <magick/MagickCore.h>
285 int main(int argc,char **argv)
301 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
305 Initialize the image info structure and read an image.
307 MagickCoreGenesis(*argv,MagickTrue);
308 exception=AcquireExceptionInfo();
309 image_info=CloneImageInfo((ImageInfo *) NULL);
310 (void) strcpy(image_info->filename,argv[1]);
311 images=ReadImage(image_info,exception);
312 if (exception->severity != UndefinedException)
313 CatchException(exception);
314 if (images == (Image *) NULL)
317 Convert the image to a thumbnail.
319 thumbnails=NewImageList();
320 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
322 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
323 if (resize_image == (Image *) NULL)
324 MagickError(exception->severity,exception->reason,exception->description);
325 (void) AppendImageToList(&thumbnails,resize_image);
329 Write the image thumbnail.
331 (void) strcpy(thumbnails->filename,argv[2]);
332 WriteImage(image_info,thumbnails);
334 Destroy the image thumbnail and exit.
336 thumbnails=DestroyImageList(thumbnails);
337 image_info=DestroyImageInfo(image_info);
338 exception=DestroyExceptionInfo(exception);
339 MagickCoreTerminus();
343 <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>
345 <div class="viewport">
346 #include <stdio.h>
347 #include <stdlib.h>
349 #include <magick/MagickCore.h>
351 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
352 const ssize_t y,const int id,void *context)
354 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
355 #define SigmoidalContrast(x) \
356 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
370 extent=GetImageViewExtent(contrast_view);
371 pixels=GetImageViewAuthenticPixels(contrast_view);
372 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
374 SetRedPixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
375 GetRedPixelComponent(pixels)));
376 SetGreenPixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
377 GetGreenPixelComponent(pixels)));
378 SetBluePixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
379 GetBluePixelComponent(pixels)));
380 SetOpacityPixelComponent(pixels,RoundToQuantum(SigmoidalContrast(
381 GetOpacityPixelComponent(pixels)));
384 indexes=GetImageViewAuthenticIndexes(contrast_view);
385 if (indexes != (IndexPacket *) NULL)
386 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
387 SetIndexPixelComponent(indexes+x,RoundToQuantum(SigmoidalContrast(
388 GetIndexPixelComponent(indexes+x))));
392 int main(int argc,char **argv)
394 #define ThrowImageException(image) \
397 CatchException(exception); \
398 if (contrast_image != (Image *) NULL) \
399 contrast_image=DestroyImage(contrast_image); \
402 #define ThrowViewException(view) \
410 description=GetImageViewException(view,&severity); \
411 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
412 description=DestroyString(description); \
433 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
439 MagickCoreGenesis(*argv,MagickTrue);
440 image_info=AcquireImageInfo();
441 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
442 exception=AcquireExceptionInfo();
443 contrast_image=ReadImage(image_info,exception);
444 if (contrast_image == (Image *) NULL)
445 ThrowImageException(contrast_image);
447 Sigmoidal non-linearity contrast control.
449 contrast_view=NewImageView(contrast_image);
450 if (contrast_view == (ImageView *) NULL)
451 ThrowImageException(contrast_image);
452 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
453 if (status == MagickFalse)
454 ThrowImageException(contrast_image);
455 contrast_view=DestroyImageView(contrast_view);
457 Write the image then destroy it.
459 status=WriteImages(image_info,contrast_image,argv[2],exception);
460 if (status == MagickFalse)
461 ThrowImageException(contrast_image);
462 contrast_image=DestroyImage(contrast_image);
463 exception=DestroyExceptionInfo(exception);
464 image_info=DestroyImageInfo(image_info);
465 MagickCoreTerminus();
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