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171 <p class="navigation-index"></p>
173 <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>
176 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
177 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
178 <li><a href="../www/api/composite.html">Composite an Image</a></li>
179 <li><a href="../www/api/image.html">Image Methods</a></li>
180 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
181 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
182 <li><a href="../www/api/distort.html">Image Distortions</a></li>
183 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
184 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
185 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
186 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
187 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
188 <li><a href="../www/api/resize.html">Resize an Image</a></li>
189 <li><a href="../www/api/transform.html">Transform an Image</a></li>
190 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
191 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
192 <li><a href="../www/api/effect.html">Add an Effect</a></li>
193 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
194 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
195 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
196 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
197 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
198 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
199 <li><a href="../www/api/feature.html">Get Image Features</a></li>
200 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
201 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
202 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
203 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
204 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
205 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
206 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
207 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
208 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
209 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
210 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
211 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
212 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
213 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
214 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
215 <li><a href="../www/api/module.html">Loadable Modules</a></li>
216 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
217 <li><a href="../www/api/registry.html">The Image Registry</a></li>
218 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
219 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
220 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
221 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
222 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
223 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
224 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
227 <p>After you write your MagickCore program, compile it like this:</p>
229 <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>
230 <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>
232 <div class="viewport">
234 #include <stdio.h>
235 #include <stdlib.h>
236 #include <string.h>
238 #include <magick/MagickCore.h>
240 int main(int argc,char **argv)
256 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
260 Initialize the image info structure and read an image.
262 MagickCoreGenesis(*argv,MagickTrue);
263 exception=AcquireExceptionInfo();
264 image_info=CloneImageInfo((ImageInfo *) NULL);
265 (void) strcpy(image_info->filename,argv[1]);
266 images=ReadImage(image_info,exception);
267 if (exception->severity != UndefinedException)
268 CatchException(exception);
269 if (images == (Image *) NULL)
272 Convert the image to a thumbnail.
274 thumbnails=NewImageList();
275 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
277 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
278 if (resize_image == (Image *) NULL)
279 MagickError(exception->severity,exception->reason,exception->description);
280 (void) AppendImageToList(&thumbnails,resize_image);
284 Write the image thumbnail.
286 (void) strcpy(thumbnails->filename,argv[2]);
287 WriteImage(image_info,thumbnails);
289 Destroy the image thumbnail and exit.
291 thumbnails=DestroyImageList(thumbnails);
292 image_info=DestroyImageInfo(image_info);
293 exception=DestroyExceptionInfo(exception);
294 MagickCoreTerminus();
299 <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>
301 <div class="viewport">
303 #include <stdio.h>
304 #include <stdlib.h>
306 #include <magick/MagickCore.h>
308 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
309 const ssize_t y,const int id,void *context)
311 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
312 #define SigmoidalContrast(x) \
313 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
327 extent=GetImageViewExtent(contrast_view);
328 pixels=GetImageViewAuthenticPixels(contrast_view);
329 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
331 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
332 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
333 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
334 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
336 indexes=GetImageViewAuthenticIndexes(contrast_view);
337 if (indexes != (IndexPacket *) NULL)
338 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
339 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
343 int main(int argc,char **argv)
345 #define ThrowImageException(image) \
348 CatchException(exception); \
349 if (contrast_image != (Image *) NULL) \
350 contrast_image=DestroyImage(contrast_image); \
353 #define ThrowViewException(view) \
361 description=GetImageViewException(view,&severity); \
362 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
363 description=DestroyString(description); \
384 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
390 MagickCoreGenesis(*argv,MagickTrue);
391 image_info=AcquireImageInfo();
392 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
393 exception=AcquireExceptionInfo();
394 contrast_image=ReadImage(image_info,exception);
395 if (contrast_image == (Image *) NULL)
396 ThrowImageException(contrast_image);
398 Sigmoidal non-linearity contrast control.
400 contrast_view=NewImageView(contrast_image);
401 if (contrast_view == (ImageView *) NULL)
402 ThrowImageException(contrast_image);
403 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
404 if (status == MagickFalse)
405 ThrowImageException(contrast_image);
406 contrast_view=DestroyImageView(contrast_view);
408 Write the image then destroy it.
410 status=WriteImages(image_info,contrast_image,argv[2],exception);
411 if (status == MagickFalse)
412 ThrowImageException(contrast_image);
413 contrast_image=DestroyImage(contrast_image);
414 exception=DestroyExceptionInfo(exception);
415 image_info=DestroyImageInfo(image_info);
416 MagickCoreTerminus();
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