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61 <p class="lead magick-description">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>
64 <li><a href="http://www.imagemagick.org/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
65 <li><a href="http://www.imagemagick.org/api/constitute.html">Constitute an Image</a></li>
66 <li><a href="api/composite.html">Composite an Image</a></li>
67 <li><a href="http://www.imagemagick.org/api/image.html">Image Methods</a></li>
68 <li><a href="http://www.imagemagick.org/api/channel.html">Image Channel Methods</a></li>
69 <li><a href="http://www.imagemagick.org/api/color.html">Count the Colors in an Image</a></li>
70 <li><a href="http://www.imagemagick.org/api/colormap.html">Colormap Methods</a></li>
71 <li><a href="http://www.imagemagick.org/api/colorspace.html">Colorspace Methods</a></li>
72 <li><a href="http://www.imagemagick.org/api/distort.html">Image Distortions</a></li>
73 <li><a href="http://www.imagemagick.org/api/layer.html">Dealing with Image Layers</a></li>
74 <li><a href="api/profile.html">Dealing with Image Profiles</a></li>
75 <li><a href="http://www.imagemagick.org/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
76 <li><a href="http://www.imagemagick.org/api/histogram.html">Image Histograms</a></li>
77 <li><a href="http://www.imagemagick.org/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
78 <li><a href="http://www.imagemagick.org/api/resize.html">Resize an Image</a></li>
79 <li><a href="http://www.imagemagick.org/api/transform.html">Transform an Image</a></li>
80 <li><a href="http://www.imagemagick.org/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
81 <li><a href="http://www.imagemagick.org/api/enhance.html">Enhance an Image</a></li>
82 <li><a href="http://www.imagemagick.org/api/effect.html">Add an Effect</a></li>
83 <li><a href="http://www.imagemagick.org/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
84 <li><a href="http://www.imagemagick.org/api/fx.html">Add a Special Effect</a></li>
85 <li><a href="http://www.imagemagick.org/api/decorate.html">Decorate an Image</a></li>
86 <li><a href="http://www.imagemagick.org/api/attribute.html">Get/Set an Image Attribute</a></li>
87 <li><a href="api/property.html">Get/Set Image Properties</a></li>
88 <li><a href="http://www.imagemagick.org/api/statistic.html">Get Image Statistics</a></li>
89 <li><a href="http://www.imagemagick.org/api/feature.html">Get Image Features</a></li>
90 <li><a href="http://www.imagemagick.org/api/annotate.html">Annotate an Image</a></li>
91 <li><a href="http://www.imagemagick.org/api/paint.html">Paint on an Image</a></li>
92 <li><a href="http://www.imagemagick.org/api/draw.html">Draw on an Image</a></li>
93 <li><a href="http://www.imagemagick.org/api/montage.html">Create an Image Thumbnail</a></li>
94 <li><a href="http://www.imagemagick.org/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
95 <li><a href="http://www.imagemagick.org/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
96 <li><a href="http://www.imagemagick.org/api/display.html">Interactively Display and Edit an Image</a></li>
97 <li><a href="http://www.imagemagick.org/api/animate.html">Interactively Animate an Image Sequence</a></li>
98 <li><a href="http://www.imagemagick.org/api/cipher.html">Convert to and from Cipher Pixels</a></li>
99 <li><a href="http://www.imagemagick.org/api/list.html">Working with Image Lists</a></li>
100 <li><a href="api/image-view.html">Image View Methods</a></li>
101 <li><a href="api/cache.html">Get or Set Image Pixels</a></li>
102 <li><a href="api/cache-view.html">Working with Cache Views</a></li>
103 <li><a href="api/stream.html">The Pixel FIFO</a></li>
104 <li><a href="http://www.imagemagick.org/api/blob.html">Read or Write Binary Large OBjects</a></li>
105 <li><a href="api/module.html">Loadable Modules</a></li>
106 <li><a href="http://www.imagemagick.org/api/signature.html">Compute a Message Digest for an Image</a></li>
107 <li><a href="http://www.imagemagick.org/api/registry.html">The Image Registry</a></li>
108 <li><a href="http://www.imagemagick.org/api/exception.html">Dealing with Exceptions</a></li>
109 <li><a href="http://www.imagemagick.org/api/memory.html">Memory Allocation</a></li>
110 <li><a href="api/resource.html">Monitor or Limit Resource Consumption</a></li>
111 <li><a href="http://www.imagemagick.org/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
112 <li><a href="http://www.imagemagick.org/api/version.html">Get the Version and Copyrights</a></li>
113 <li><a href="http://www.imagemagick.org/api/mime.html">Mime Methods</a></li>
114 <li><a href="http://www.imagemagick.org/api/deprecate.html">Deprecated Methods</a></li>
115 <li><a href="exception.html">Error and Warning Codes</a></li>
118 <p>After you write your MagickCore program, compile it like this:</p>
121 cc -o core core.c `pkg-config --cflags --libs MagickCore`
124 <p>Note, if your instance of ImageMagick does not support modules but does include support for the WMF image format, you'll need to link with the <a href="magick-wand.html">MagickWand</a> library instead (since it is a dependency of the WMF image format):</p>
127 cc -o core core.c `pkg-config --cflags --libs MagickWand`
130 <p>Set the <code>PKG_CONFIG_PATH</code> environment variable if ImageMagick is not in your default system path:</p>
133 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
136 <p>Here is a example program that utilizes the MagickCore API to get you started, <a href="http://www.imagemagick.org/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>
138 <pre class="pre-scrollable">#include <stdio.h>
139 #include <stdlib.h>
140 #include <string.h>
142 #include <magick/MagickCore.h>
144 int main(int argc,char **argv)
160 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
164 Initialize the image info structure and read an image.
166 MagickCoreGenesis(*argv,MagickTrue);
167 exception=AcquireExceptionInfo();
168 image_info=CloneImageInfo((ImageInfo *) NULL);
169 (void) strcpy(image_info->filename,argv[1]);
170 images=ReadImage(image_info,exception);
171 if (exception->severity != UndefinedException)
172 CatchException(exception);
173 if (images == (Image *) NULL)
176 Convert the image to a thumbnail.
178 thumbnails=NewImageList();
179 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
181 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
182 if (resize_image == (Image *) NULL)
183 MagickError(exception->severity,exception->reason,exception->description);
184 (void) AppendImageToList(&thumbnails,resize_image);
188 Write the image thumbnail.
190 (void) strcpy(thumbnails->filename,argv[2]);
191 WriteImage(image_info,thumbnails);
193 Destroy the image thumbnail and exit.
195 thumbnails=DestroyImageList(thumbnails);
196 image_info=DestroyImageInfo(image_info);
197 exception=DestroyExceptionInfo(exception);
198 MagickCoreTerminus();
201 <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="http://www.imagemagick.org/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>
203 <pre class="pre-scrollable">#include <stdio.h>
204 #include <stdlib.h>
206 #include <magick/MagickCore.h>
208 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
209 const ssize_t y,const int id,void *context)
211 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
212 #define SigmoidalContrast(x) \
213 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
227 extent=GetImageViewExtent(contrast_view);
228 pixels=GetImageViewAuthenticPixels(contrast_view);
229 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
231 SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
232 SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
233 SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
234 SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
237 indexes=GetImageViewAuthenticIndexes(contrast_view);
238 if (indexes != (IndexPacket *) NULL)
239 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
240 SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
244 int main(int argc,char **argv)
246 #define ThrowImageException(image) \
249 CatchException(exception); \
250 if (contrast_image != (Image *) NULL) \
251 contrast_image=DestroyImage(contrast_image); \
254 #define ThrowViewException(view) \
262 description=GetImageViewException(view,&severity); \
263 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
264 description=DestroyString(description); \
285 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
291 MagickCoreGenesis(*argv,MagickTrue);
292 image_info=AcquireImageInfo();
293 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
294 exception=AcquireExceptionInfo();
295 contrast_image=ReadImage(image_info,exception);
296 if (contrast_image == (Image *) NULL)
297 ThrowImageException(contrast_image);
299 Sigmoidal non-linearity contrast control.
301 contrast_view=NewImageView(contrast_image);
302 if (contrast_view == (ImageView *) NULL)
303 ThrowImageException(contrast_image);
304 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
305 if (status == MagickFalse)
306 ThrowImageException(contrast_image);
307 contrast_view=DestroyImageView(contrast_view);
309 Write the image then destroy it.
311 status=WriteImages(image_info,contrast_image,argv[2],exception);
312 if (status == MagickFalse)
313 ThrowImageException(contrast_image);
314 contrast_image=DestroyImage(contrast_image);
315 exception=DestroyExceptionInfo(exception);
316 image_info=DestroyImageInfo(image_info);
317 MagickCoreTerminus();
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