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57 <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>
60 <li><a href="http://www.imagemagick.org/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
61 <li><a href="http://www.imagemagick.org/api/constitute.html">Constitute an Image</a></li>
62 <li><a href="api/composite.html">Composite an Image</a></li>
63 <li><a href="http://www.imagemagick.org/api/image.html">Image Methods</a></li>
64 <li><a href="http://www.imagemagick.org/api/channel.html">Image Channel Methods</a></li>
65 <li><a href="http://www.imagemagick.org/api/color.html">Count the Colors in an Image</a></li>
66 <li><a href="http://www.imagemagick.org/api/colormap.html">Colormap Methods</a></li>
67 <li><a href="http://www.imagemagick.org/api/colorspace.html">Colorspace Methods</a></li>
68 <li><a href="http://www.imagemagick.org/api/distort.html">Image Distortions</a></li>
69 <li><a href="http://www.imagemagick.org/api/layer.html">Dealing with Image Layers</a></li>
70 <li><a href="api/profile.html">Dealing with Image Profiles</a></li>
71 <li><a href="http://www.imagemagick.org/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
72 <li><a href="http://www.imagemagick.org/api/histogram.html">Image Histograms</a></li>
73 <li><a href="http://www.imagemagick.org/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
74 <li><a href="http://www.imagemagick.org/api/resize.html">Resize an Image</a></li>
75 <li><a href="http://www.imagemagick.org/api/transform.html">Transform an Image</a></li>
76 <li><a href="http://www.imagemagick.org/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
77 <li><a href="http://www.imagemagick.org/api/enhance.html">Enhance an Image</a></li>
78 <li><a href="http://www.imagemagick.org/api/effect.html">Add an Effect</a></li>
79 <li><a href="http://www.imagemagick.org/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
80 <li><a href="http://www.imagemagick.org/api/fx.html">Add a Special Effect</a></li>
81 <li><a href="http://www.imagemagick.org/api/decorate.html">Decorate an Image</a></li>
82 <li><a href="http://www.imagemagick.org/api/attribute.html">Get/Set an Image Attribute</a></li>
83 <li><a href="api/property.html">Get/Set Image Properties</a></li>
84 <li><a href="http://www.imagemagick.org/api/statistic.html">Get Image Statistics</a></li>
85 <li><a href="http://www.imagemagick.org/api/feature.html">Get Image Features</a></li>
86 <li><a href="http://www.imagemagick.org/api/annotate.html">Annotate an Image</a></li>
87 <li><a href="http://www.imagemagick.org/api/paint.html">Paint on an Image</a></li>
88 <li><a href="http://www.imagemagick.org/api/draw.html">Draw on an Image</a></li>
89 <li><a href="http://www.imagemagick.org/api/montage.html">Create an Image Thumbnail</a></li>
90 <li><a href="http://www.imagemagick.org/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
91 <li><a href="http://www.imagemagick.org/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
92 <li><a href="http://www.imagemagick.org/api/display.html">Interactively Display and Edit an Image</a></li>
93 <li><a href="http://www.imagemagick.org/api/animate.html">Interactively Animate an Image Sequence</a></li>
94 <li><a href="http://www.imagemagick.org/api/cipher.html">Convert to and from Cipher Pixels</a></li>
95 <li><a href="http://www.imagemagick.org/api/list.html">Working with Image Lists</a></li>
96 <li><a href="api/image-view.html">Image View Methods</a></li>
97 <li><a href="api/cache.html">Get or Set Image Pixels</a></li>
98 <li><a href="api/cache-view.html">Working with Cache Views</a></li>
99 <li><a href="api/stream.html">The Pixel FIFO</a></li>
100 <li><a href="http://www.imagemagick.org/api/blob.html">Read or Write Binary Large OBjects</a></li>
101 <li><a href="api/module.html">Loadable Modules</a></li>
102 <li><a href="http://www.imagemagick.org/api/signature.html">Compute a Message Digest for an Image</a></li>
103 <li><a href="http://www.imagemagick.org/api/registry.html">The Image Registry</a></li>
104 <li><a href="http://www.imagemagick.org/api/exception.html">Dealing with Exceptions</a></li>
105 <li><a href="http://www.imagemagick.org/api/memory.html">Memory Allocation</a></li>
106 <li><a href="api/resource.html">Monitor or Limit Resource Consumption</a></li>
107 <li><a href="http://www.imagemagick.org/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
108 <li><a href="http://www.imagemagick.org/api/version.html">Get the Version and Copyrights</a></li>
109 <li><a href="http://www.imagemagick.org/api/mime.html">Mime Methods</a></li>
110 <li><a href="http://www.imagemagick.org/api/deprecate.html">Deprecated Methods</a></li>
111 <li><a href="exception.html">Error and Warning Codes</a></li>
114 <p>After you write your MagickCore program, compile it like this:</p>
117 cc -o core core.c `pkg-config --cflags --libs MagickWand`
120 <p>Set the <code>PKG_CONFIG_PATH</code> environment variable if ImageMagick is not in your default system path:</p>
123 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
126 <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>
128 <pre class="pre-scrollable"><code>#include <stdio.h>
129 #include <stdlib.h>
130 #include <string.h>
132 #include <MagickCore/MagickCore.h>
134 int main(int argc,char **argv)
150 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
154 Initialize the image info structure and read an image.
156 MagickCoreGenesis(*argv,MagickTrue);
157 exception=AcquireExceptionInfo();
158 image_info=CloneImageInfo((ImageInfo *) NULL);
159 (void) strcpy(image_info->filename,argv[1]);
160 images=ReadImage(image_info,exception);
161 if (exception->severity != UndefinedException)
162 CatchException(exception);
163 if (images == (Image *) NULL)
166 Convert the image to a thumbnail.
168 thumbnails=NewImageList();
169 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
171 resize_image=ResizeImage(image,106,80,LanczosFilter,exception);
172 if (resize_image == (Image *) NULL)
173 MagickError(exception->severity,exception->reason,exception->description);
174 (void) AppendImageToList(&thumbnails,resize_image);
178 Write the image thumbnail.
180 (void) strcpy(thumbnails->filename,argv[2]);
181 WriteImage(image_info,thumbnails,exception);
183 Destroy the image thumbnail and exit.
185 thumbnails=DestroyImageList(thumbnails);
186 image_info=DestroyImageInfo(image_info);
187 exception=DestroyExceptionInfo(exception);
188 MagickCoreTerminus();
191 <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>
193 <pre class="pre-scrollable"><code>#include <stdio.h>
194 #include <stdlib.h>
196 #include <MagickCore/MagickCore.h>
198 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
199 const ssize_t y,const int id,void *context)
201 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
202 #define SigmoidalContrast(x) \
203 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
217 extent=GetImageViewExtent(contrast_view);
218 pixels=GetImageViewAuthenticPixels(contrast_view);
219 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
221 SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
222 SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
223 SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
224 SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
227 indexes=GetImageViewAuthenticIndexes(contrast_view);
228 if (indexes != (IndexPacket *) NULL)
229 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
230 SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
234 int main(int argc,char **argv)
236 #define ThrowImageException(image) \
239 CatchException(exception); \
240 if (contrast_image != (Image *) NULL) \
241 contrast_image=DestroyImage(contrast_image); \
244 #define ThrowViewException(view) \
252 description=GetImageViewException(view,&severity); \
253 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
254 description=DestroyString(description); \
275 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
281 MagickCoreGenesis(*argv,MagickTrue);
282 image_info=AcquireImageInfo();
283 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
284 exception=AcquireExceptionInfo();
285 contrast_image=ReadImage(image_info,exception);
286 if (contrast_image == (Image *) NULL)
287 ThrowImageException(contrast_image);
289 Sigmoidal non-linearity contrast control.
291 contrast_view=NewImageView(contrast_image);
292 if (contrast_view == (ImageView *) NULL)
293 ThrowImageException(contrast_image);
294 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
295 if (status == MagickFalse)
296 ThrowImageException(contrast_image);
297 contrast_view=DestroyImageView(contrast_view);
299 Write the image then destroy it.
301 status=WriteImages(image_info,contrast_image,argv[2],exception);
302 if (status == MagickFalse)
303 ThrowImageException(contrast_image);
304 contrast_image=DestroyImage(contrast_image);
305 exception=DestroyExceptionInfo(exception);
306 image_info=DestroyImageInfo(image_info);
307 MagickCoreTerminus();
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