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178 <h1>MagickCore C API</h1>
180 <div class="doc-section">
182 <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>
185 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
186 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
187 <li><a href="../www/api/composite.html">Composite an Image</a></li>
188 <li><a href="../www/api/image.html">Image Methods</a></li>
189 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
190 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
191 <li><a href="../www/api/distort.html">Image Distortions</a></li>
192 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
193 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
194 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
195 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
196 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
197 <li><a href="../www/api/resize.html">Resize an Image</a></li>
198 <li><a href="../www/api/transform.html">Transform an Image</a></li>
199 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
200 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
201 <li><a href="../www/api/effect.html">Add an Effect</a></li>
202 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
203 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
204 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
205 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
206 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
207 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
208 <li><a href="../www/api/feature.html">Get Image Features</a></li>
209 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
210 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
211 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
212 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
213 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
214 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
215 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
216 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
217 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
218 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
219 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
220 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
221 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
222 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
223 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
224 <li><a href="../www/api/module.html">Loadable Modules</a></li>
225 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
226 <li><a href="../www/api/registry.html">The Image Registry</a></li>
227 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
228 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
229 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
230 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
231 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
232 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
233 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
236 <p>After you write your MagickCore program, compile it like this:</p>
238 <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>
239 <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>
241 <div class="viewport">
243 #include <stdio.h>
244 #include <stdlib.h>
245 #include <string.h>
247 #include <magick/MagickCore.h>
249 int main(int argc,char **argv)
265 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
269 Initialize the image info structure and read an image.
271 MagickCoreGenesis(*argv,MagickTrue);
272 exception=AcquireExceptionInfo();
273 image_info=CloneImageInfo((ImageInfo *) NULL);
274 (void) strcpy(image_info->filename,argv[1]);
275 images=ReadImage(image_info,exception);
276 if (exception->severity != UndefinedException)
277 CatchException(exception);
278 if (images == (Image *) NULL)
281 Convert the image to a thumbnail.
283 thumbnails=NewImageList();
284 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
286 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
287 if (resize_image == (Image *) NULL)
288 MagickError(exception->severity,exception->reason,exception->description);
289 (void) AppendImageToList(&thumbnails,resize_image);
293 Write the image thumbnail.
295 (void) strcpy(thumbnails->filename,argv[2]);
296 WriteImage(image_info,thumbnails);
298 Destroy the image thumbnail and exit.
300 thumbnails=DestroyImageList(thumbnails);
301 image_info=DestroyImageInfo(image_info);
302 exception=DestroyExceptionInfo(exception);
303 MagickCoreTerminus();
308 <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>
310 <div class="viewport">
312 #include <stdio.h>
313 #include <stdlib.h>
315 #include <magick/MagickCore.h>
317 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
318 const ssize_t y,const int id,void *context)
320 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
321 #define SigmoidalContrast(x) \
322 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
336 extent=GetImageViewExtent(contrast_view);
337 pixels=GetImageViewAuthenticPixels(contrast_view);
338 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
340 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
341 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
342 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
343 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
345 indexes=GetImageViewAuthenticIndexes(contrast_view);
346 if (indexes != (IndexPacket *) NULL)
347 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
348 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
352 int main(int argc,char **argv)
354 #define ThrowImageException(image) \
357 CatchException(exception); \
358 if (contrast_image != (Image *) NULL) \
359 contrast_image=DestroyImage(contrast_image); \
362 #define ThrowViewException(view) \
370 description=GetImageViewException(view,&severity); \
371 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
372 description=DestroyString(description); \
393 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
399 MagickCoreGenesis(*argv,MagickTrue);
400 image_info=AcquireImageInfo();
401 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
402 exception=AcquireExceptionInfo();
403 contrast_image=ReadImage(image_info,exception);
404 if (contrast_image == (Image *) NULL)
405 ThrowImageException(contrast_image);
407 Sigmoidal non-linearity contrast control.
409 contrast_view=NewImageView(contrast_image);
410 if (contrast_view == (ImageView *) NULL)
411 ThrowImageException(contrast_image);
412 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
413 if (status == MagickFalse)
414 ThrowImageException(contrast_image);
415 contrast_view=DestroyImageView(contrast_view);
417 Write the image then destroy it.
419 status=WriteImages(image_info,contrast_image,argv[2],exception);
420 if (status == MagickFalse)
421 ThrowImageException(contrast_image);
422 contrast_image=DestroyImage(contrast_image);
423 exception=DestroyExceptionInfo(exception);
424 image_info=DestroyImageInfo(image_info);
425 MagickCoreTerminus();
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