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13 <title>ImageMagick: MagickCore, Low-level C API for ImageMagick</title>
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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>
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>
166 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
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>
178 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
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>
181 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
182 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
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>
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>
195 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
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>
212 <p>After you write your MagickCore program, compile it like this:</p>
214 <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>cc `MagickCore-config --cflags --cppflags` core.c \ <br/> `MagickCore-config --ldflags --libs`</span></p>
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>
217 <div class="viewport">
219 #include <stdio.h>
220 #include <stdlib.h>
221 #include <string.h>
223 #include <magick/MagickCore.h>
225 int main(int argc,char **argv)
241 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
245 Initialize the image info structure and read an image.
247 MagickCoreGenesis(*argv,MagickTrue);
248 exception=AcquireExceptionInfo();
249 image_info=CloneImageInfo((ImageInfo *) NULL);
250 (void) strcpy(image_info->filename,argv[1]);
251 images=ReadImage(image_info,exception);
252 if (exception->severity != UndefinedException)
253 CatchException(exception);
254 if (images == (Image *) NULL)
257 Convert the image to a thumbnail.
259 thumbnails=NewImageList();
260 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
262 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
263 if (resize_image == (Image *) NULL)
264 MagickError(exception->severity,exception->reason,exception->description);
265 (void) AppendImageToList(&thumbnails,resize_image);
269 Write the image thumbnail.
271 (void) strcpy(thumbnails->filename,argv[2]);
272 WriteImage(image_info,thumbnails);
274 Destroy the image thumbnail and exit.
276 thumbnails=DestroyImageList(thumbnails);
277 image_info=DestroyImageInfo(image_info);
278 exception=DestroyExceptionInfo(exception);
279 MagickCoreTerminus();
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/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>
286 <div class="viewport">
288 #include <stdio.h>
289 #include <stdlib.h>
291 #include <magick/MagickCore.h>
293 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
294 const ssize_t y,const int id,void *context)
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)
312 extent=GetImageViewExtent(contrast_view);
313 pixels=GetImageViewAuthenticPixels(contrast_view);
314 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
316 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
317 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
318 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
319 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
321 indexes=GetImageViewAuthenticIndexes(contrast_view);
322 if (indexes != (IndexPacket *) NULL)
323 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
324 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
328 int main(int argc,char **argv)
330 #define ThrowImageException(image) \
333 CatchException(exception); \
334 if (contrast_image != (Image *) NULL) \
335 contrast_image=DestroyImage(contrast_image); \
338 #define ThrowViewException(view) \
346 description=GetImageViewException(view,&severity); \
347 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
348 description=DestroyString(description); \
369 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
375 MagickCoreGenesis(*argv,MagickTrue);
376 image_info=AcquireImageInfo();
377 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
378 exception=AcquireExceptionInfo();
379 contrast_image=ReadImage(image_info,exception);
380 if (contrast_image == (Image *) NULL)
381 ThrowImageException(contrast_image);
383 Sigmoidal non-linearity contrast control.
385 contrast_view=NewImageView(contrast_image);
386 if (contrast_view == (ImageView *) NULL)
387 ThrowImageException(contrast_image);
388 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
389 if (status == MagickFalse)
390 ThrowImageException(contrast_image);
391 contrast_view=DestroyImageView(contrast_view);
393 Write the image then destroy it.
395 status=WriteImages(image_info,contrast_image,argv[2],exception);
396 if (status == MagickFalse)
397 ThrowImageException(contrast_image);
398 contrast_image=DestroyImage(contrast_image);
399 exception=DestroyExceptionInfo(exception);
400 image_info=DestroyImageInfo(image_info);
401 MagickCoreTerminus();
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