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174 <p class="navigation-index"></p>
176 <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>
179 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
180 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
181 <li><a href="../www/api/composite.html">Composite an Image</a></li>
182 <li><a href="../www/api/image.html">Image Methods</a></li>
183 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
184 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
185 <li><a href="../www/api/distort.html">Image Distortions</a></li>
186 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
187 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
188 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
189 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
190 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
191 <li><a href="../www/api/resize.html">Resize an Image</a></li>
192 <li><a href="../www/api/transform.html">Transform an Image</a></li>
193 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
194 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
195 <li><a href="../www/api/effect.html">Add an Effect</a></li>
196 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
197 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
198 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
199 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
200 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
201 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
202 <li><a href="../www/api/feature.html">Get Image Features</a></li>
203 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
204 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
205 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
206 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
207 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
208 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
209 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
210 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
211 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
212 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
213 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
214 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
215 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
216 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
217 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
218 <li><a href="../www/api/module.html">Loadable Modules</a></li>
219 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
220 <li><a href="../www/api/registry.html">The Image Registry</a></li>
221 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
222 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
223 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
224 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
225 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
226 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
227 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
230 <p>After you write your MagickCore program, compile it like this:</p>
232 <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>
233 <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>
235 <div class="viewport">
237 #include <stdio.h>
238 #include <stdlib.h>
239 #include <string.h>
241 #include <magick/MagickCore.h>
243 int main(int argc,char **argv)
259 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
263 Initialize the image info structure and read an image.
265 MagickCoreGenesis(*argv,MagickTrue);
266 exception=AcquireExceptionInfo();
267 image_info=CloneImageInfo((ImageInfo *) NULL);
268 (void) strcpy(image_info->filename,argv[1]);
269 images=ReadImage(image_info,exception);
270 if (exception->severity != UndefinedException)
271 CatchException(exception);
272 if (images == (Image *) NULL)
275 Convert the image to a thumbnail.
277 thumbnails=NewImageList();
278 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
280 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
281 if (resize_image == (Image *) NULL)
282 MagickError(exception->severity,exception->reason,exception->description);
283 (void) AppendImageToList(&thumbnails,resize_image);
287 Write the image thumbnail.
289 (void) strcpy(thumbnails->filename,argv[2]);
290 WriteImage(image_info,thumbnails);
292 Destroy the image thumbnail and exit.
294 thumbnails=DestroyImageList(thumbnails);
295 image_info=DestroyImageInfo(image_info);
296 exception=DestroyExceptionInfo(exception);
297 MagickCoreTerminus();
302 <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>
304 <div class="viewport">
306 #include <stdio.h>
307 #include <stdlib.h>
309 #include <magick/MagickCore.h>
311 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
312 const ssize_t y,const int id,void *context)
314 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
315 #define SigmoidalContrast(x) \
316 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
330 extent=GetImageViewExtent(contrast_view);
331 pixels=GetImageViewAuthenticPixels(contrast_view);
332 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
334 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
335 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
336 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
337 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
339 indexes=GetImageViewAuthenticIndexes(contrast_view);
340 if (indexes != (IndexPacket *) NULL)
341 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
342 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
346 int main(int argc,char **argv)
348 #define ThrowImageException(image) \
351 CatchException(exception); \
352 if (contrast_image != (Image *) NULL) \
353 contrast_image=DestroyImage(contrast_image); \
356 #define ThrowViewException(view) \
364 description=GetImageViewException(view,&severity); \
365 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
366 description=DestroyString(description); \
387 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
393 MagickCoreGenesis(*argv,MagickTrue);
394 image_info=AcquireImageInfo();
395 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
396 exception=AcquireExceptionInfo();
397 contrast_image=ReadImage(image_info,exception);
398 if (contrast_image == (Image *) NULL)
399 ThrowImageException(contrast_image);
401 Sigmoidal non-linearity contrast control.
403 contrast_view=NewImageView(contrast_image);
404 if (contrast_view == (ImageView *) NULL)
405 ThrowImageException(contrast_image);
406 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
407 if (status == MagickFalse)
408 ThrowImageException(contrast_image);
409 contrast_view=DestroyImageView(contrast_view);
411 Write the image then destroy it.
413 status=WriteImages(image_info,contrast_image,argv[2],exception);
414 if (status == MagickFalse)
415 ThrowImageException(contrast_image);
416 contrast_image=DestroyImage(contrast_image);
417 exception=DestroyExceptionInfo(exception);
418 image_info=DestroyImageInfo(image_info);
419 MagickCoreTerminus();
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