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177 <h1>MagickCore C API</h1>
179 <div class="doc-section">
181 <p>The <a href="http://www.imagemagick.org/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="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>
184 <li><a href="../api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
185 <li><a href="../api/constitute.html">Constitute an Image</a></li>
186 <li><a href="../api/composite.html">Composite an Image</a></li>
187 <li><a href="../api/image.html">Image Methods</a></li>
188 <li><a href="../api/channel.html">Image Channel Methods</a></li>
189 <li><a href="../api/color.html">Count the Colors in an Image</a></li>
190 <li><a href="../api/colormap.html">Colormap Methods</a></li>
191 <li><a href="../api/colorspace.html">Colorspace Methods</a></li>
192 <li><a href="../api/distort.html">Image Distortions</a></li>
193 <li><a href="../api/layer.html">Dealing with Image Layers</a></li>
194 <li><a href="../api/profile.html">Dealing with Image Profiles</a></li>
195 <li><a href="../api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
196 <li><a href="../api/histogram.html">Image Histograms</a></li>
197 <li><a href="../api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
198 <li><a href="../api/resize.html">Resize an Image</a></li>
199 <li><a href="../api/transform.html">Transform an Image</a></li>
200 <li><a href="../api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
201 <li><a href="../api/enhance.html">Enhance an Image</a></li>
202 <li><a href="../api/effect.html">Add an Effect</a></li>
203 <li><a href="../api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
204 <li><a href="../api/fx.html">Add a Special Effect</a></li>
205 <li><a href="../api/decorate.html">Decorate an Image</a></li>
206 <li><a href="../api/attribute.html">Get/Set an Image Attribute</a></li>
207 <li><a href="../api/property.html">Get/Set Image Properties</a></li>
208 <li><a href="../api/statistic.html">Get Image Statistics</a></li>
209 <li><a href="../api/feature.html">Get Image Features</a></li>
210 <li><a href="../api/annotate.html">Annotate an Image</a></li>
211 <li><a href="../api/paint.html">Paint on an Image</a></li>
212 <li><a href="../api/draw.html">Draw on an Image</a></li>
213 <li><a href="../api/montage.html">Create an Image Thumbnail</a></li>
214 <li><a href="../api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
215 <li><a href="../api/compare.html">Compare an Image to a Reconstructed Image</a></li>
216 <li><a href="../api/display.html">Interactively Display and Edit an Image</a></li>
217 <li><a href="../api/animate.html">Interactively Animate an Image Sequence</a></li>
218 <li><a href="../api/cipher.html">Convert to and from Cipher Pixels</a></li>
219 <li><a href="../api/list.html">Working with Image Lists</a></li>
220 <li><a href="../api/image-view.html">Image View Methods</a></li>
221 <li><a href="../api/cache.html">Get or Set Image Pixels</a></li>
222 <li><a href="../api/cache-view.html">Working with Cache Views</a></li>
223 <li><a href="../api/stream.html">The Pixel FIFO</a></li>
224 <li><a href="../api/blob.html">Read or Write Binary Large OBjects</a></li>
225 <li><a href="../api/module.html">Loadable Modules</a></li>
226 <li><a href="../api/signature.html">Compute a Message Digest for an Image</a></li>
227 <li><a href="../api/registry.html">The Image Registry</a></li>
228 <li><a href="../api/exception.html">Dealing with Exceptions</a></li>
229 <li><a href="../api/memory.html">Memory Allocation</a></li>
230 <li><a href="../api/resource.html">Monitor or Limit Resource Consumption</a></li>
231 <li><a href="../api/monitor.html">Monitor the Progress of an Image Operation</a></li>
232 <li><a href="../api/version.html">Get the Version and Copyrights</a></li>
233 <li><a href="../api/deprecate.html">Deprecated Methods</a></li>
234 <li><a href="exception.html">Error and Warning Codes</a></li>
237 <p>After you write your MagickCore program, compile it like this:</p>
239 <p class="crt"><span class="crtprompt"> $ </span><span class="crtin">cc -o core `pkg-config --cflags --libs MagickCore` core.c</span></p>
240 <p>Set the <code>PKG_CONFIG_PATH</code> environment variable if ImageMagick is not in your default system path:</p>
241 <p class="crt"><span class="crtprompt"> $ </span><span class="crtin">export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig</span></p>
242 <p>Here is a example program that utilizes the MagickCore API to get you started, <a href="../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>
244 <div class="viewport">
245 #include <stdio.h>
246 #include <stdlib.h>
247 #include <string.h>
248 #include <time.h>
249 #include <magick/MagickCore.h>
251 int main(int argc,char **argv)
267 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
271 Initialize the image info structure and read an image.
273 MagickCoreGenesis(*argv,MagickTrue);
274 exception=AcquireExceptionInfo();
275 image_info=CloneImageInfo((ImageInfo *) NULL);
276 (void) strcpy(image_info->filename,argv[1]);
277 images=ReadImage(image_info,exception);
278 if (exception->severity != UndefinedException)
279 CatchException(exception);
280 if (images == (Image *) NULL)
283 Convert the image to a thumbnail.
285 thumbnails=NewImageList();
286 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
288 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
289 if (resize_image == (Image *) NULL)
290 MagickError(exception->severity,exception->reason,exception->description);
291 (void) AppendImageToList(&thumbnails,resize_image);
295 Write the image thumbnail.
297 (void) strcpy(thumbnails->filename,argv[2]);
298 WriteImage(image_info,thumbnails);
300 Destroy the image thumbnail and exit.
302 thumbnails=DestroyImageList(thumbnails);
303 image_info=DestroyImageInfo(image_info);
304 exception=DestroyExceptionInfo(exception);
305 MagickCoreTerminus();
309 <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="../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>
311 <div class="viewport">
312 #include <stdio.h>
313 #include <stdlib.h>
314 #include <math.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 SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
341 SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
342 SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
343 SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
346 indexes=GetImageViewAuthenticIndexes(contrast_view);
347 if (indexes != (IndexPacket *) NULL)
348 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
349 SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
353 int main(int argc,char **argv)
355 #define ThrowImageException(image) \
358 CatchException(exception); \
359 if (contrast_image != (Image *) NULL) \
360 contrast_image=DestroyImage(contrast_image); \
363 #define ThrowViewException(view) \
371 description=GetImageViewException(view,&severity); \
372 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
373 description=DestroyString(description); \
394 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
400 MagickCoreGenesis(*argv,MagickTrue);
401 image_info=AcquireImageInfo();
402 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
403 exception=AcquireExceptionInfo();
404 contrast_image=ReadImage(image_info,exception);
405 if (contrast_image == (Image *) NULL)
406 ThrowImageException(contrast_image);
408 Sigmoidal non-linearity contrast control.
410 contrast_view=NewImageView(contrast_image);
411 if (contrast_view == (ImageView *) NULL)
412 ThrowImageException(contrast_image);
413 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
414 if (status == MagickFalse)
415 ThrowImageException(contrast_image);
416 contrast_view=DestroyImageView(contrast_view);
418 Write the image then destroy it.
420 status=WriteImages(image_info,contrast_image,argv[2],exception);
421 if (status == MagickFalse)
422 ThrowImageException(contrast_image);
423 contrast_image=DestroyImage(contrast_image);
424 exception=DestroyExceptionInfo(exception);
425 image_info=DestroyImageInfo(image_info);
426 MagickCoreTerminus();
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