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85 <p class="lead magick-description">The <a href="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>
88 <li><a href="api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
89 <li><a href="api/constitute.html">Constitute an Image</a></li>
90 <li><a href="api/composite.html">Composite an Image</a></li>
91 <li><a href="api/image.html">Image Methods</a></li>
92 <li><a href="api/channel.html">Image Channel Methods</a></li>
93 <li><a href="api/color.html">Count the Colors in an Image</a></li>
94 <li><a href="api/colormap.html">Colormap Methods</a></li>
95 <li><a href="api/colorspace.html">Colorspace Methods</a></li>
96 <li><a href="api/distort.html">Image Distortions</a></li>
97 <li><a href="api/layer.html">Dealing with Image Layers</a></li>
98 <li><a href="api/profile.html">Dealing with Image Profiles</a></li>
99 <li><a href="api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
100 <li><a href="api/histogram.html">Image Histograms</a></li>
101 <li><a href="api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
102 <li><a href="api/resize.html">Resize an Image</a></li>
103 <li><a href="api/transform.html">Transform an Image</a></li>
104 <li><a href="api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
105 <li><a href="api/enhance.html">Enhance an Image</a></li>
106 <li><a href="api/effect.html">Add an Effect</a></li>
107 <li><a href="api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
108 <li><a href="api/fx.html">Add a Special Effect</a></li>
109 <li><a href="api/decorate.html">Decorate an Image</a></li>
110 <li><a href="api/attribute.html">Get/Set an Image Attribute</a></li>
111 <li><a href="api/property.html">Get/Set Image Properties</a></li>
112 <li><a href="api/statistic.html">Get Image Statistics</a></li>
113 <li><a href="api/feature.html">Get Image Features</a></li>
114 <li><a href="api/annotate.html">Annotate an Image</a></li>
115 <li><a href="api/paint.html">Paint on an Image</a></li>
116 <li><a href="api/draw.html">Draw on an Image</a></li>
117 <li><a href="api/montage.html">Create an Image Thumbnail</a></li>
118 <li><a href="api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
119 <li><a href="api/compare.html">Compare an Image to a Reconstructed Image</a></li>
120 <li><a href="api/display.html">Interactively Display and Edit an Image</a></li>
121 <li><a href="api/animate.html">Interactively Animate an Image Sequence</a></li>
122 <li><a href="api/cipher.html">Convert to and from Cipher Pixels</a></li>
123 <li><a href="api/list.html">Working with Image Lists</a></li>
124 <li><a href="api/image-view.html">Image View Methods</a></li>
125 <li><a href="api/cache.html">Get or Set Image Pixels</a></li>
126 <li><a href="api/cache-view.html">Working with Cache Views</a></li>
127 <li><a href="api/stream.html">The Pixel FIFO</a></li>
128 <li><a href="api/blob.html">Read or Write Binary Large OBjects</a></li>
129 <li><a href="api/module.html">Loadable Modules</a></li>
130 <li><a href="api/signature.html">Compute a Message Digest for an Image</a></li>
131 <li><a href="api/registry.html">The Image Registry</a></li>
132 <li><a href="api/exception.html">Dealing with Exceptions</a></li>
133 <li><a href="api/memory.html">Memory Allocation</a></li>
134 <li><a href="api/resource.html">Monitor or Limit Resource Consumption</a></li>
135 <li><a href="api/monitor.html">Monitor the Progress of an Image Operation</a></li>
136 <li><a href="api/version.html">Get the Version and Copyrights</a></li>
137 <li><a href="api/mime.html">Mime Methods</a></li>
138 <li><a href="api/deprecate.html">Deprecated Methods</a></li>
139 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
142 <p>After you write your MagickCore program, compile it like this:</p>
144 <pre class="highlight"><code>cc -o core core.c `pkg-config --cflags --libs MagickWand`
147 <p>Set the <code>PKG_CONFIG_PATH</code> environment variable if ImageMagick is not in your default system path:</p>
149 <pre class="highlight"><code>export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
152 <p>Here is a example program that utilizes the MagickCore API to get you started, <a href="https://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>
154 <pre class="pre-scrollable"><code>#include <stdio.h>
155 #include <stdlib.h>
156 #include <string.h>
158 #include <MagickCore/MagickCore.h>
160 int main(int argc,char **argv)
176 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
180 Initialize the image info structure and read an image.
182 MagickCoreGenesis(*argv,MagickTrue);
183 exception=AcquireExceptionInfo();
184 image_info=CloneImageInfo((ImageInfo *) NULL);
185 (void) strcpy(image_info->filename,argv[1]);
186 images=ReadImage(image_info,exception);
187 if (exception->severity != UndefinedException)
188 CatchException(exception);
189 if (images == (Image *) NULL)
192 Convert the image to a thumbnail.
194 thumbnails=NewImageList();
195 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
197 resize_image=ResizeImage(image,106,80,LanczosFilter,exception);
198 if (resize_image == (Image *) NULL)
199 MagickError(exception->severity,exception->reason,exception->description);
200 (void) AppendImageToList(&thumbnails,resize_image);
204 Write the image thumbnail.
206 (void) strcpy(thumbnails->filename,argv[2]);
207 WriteImage(image_info,thumbnails,exception);
209 Destroy the image thumbnail and exit.
211 thumbnails=DestroyImageList(thumbnails);
212 image_info=DestroyImageInfo(image_info);
213 exception=DestroyExceptionInfo(exception);
214 MagickCoreTerminus();
217 <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="https://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>
219 <pre class="pre-scrollable"><code>#include <stdio.h>
220 #include <stdlib.h>
222 #include <MagickCore/MagickCore.h>
224 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
225 const ssize_t y,const int id,void *context)
227 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
228 #define SigmoidalContrast(x) \
229 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
243 extent=GetImageViewExtent(contrast_view);
244 pixels=GetImageViewAuthenticPixels(contrast_view);
245 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
247 SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
248 SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
249 SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
250 SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
253 indexes=GetImageViewAuthenticIndexes(contrast_view);
254 if (indexes != (IndexPacket *) NULL)
255 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
256 SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
260 int main(int argc,char **argv)
262 #define ThrowImageException(image) \
265 CatchException(exception); \
266 if (contrast_image != (Image *) NULL) \
267 contrast_image=DestroyImage(contrast_image); \
270 #define ThrowViewException(view) \
278 description=GetImageViewException(view,&severity); \
279 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
280 description=DestroyString(description); \
301 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
307 MagickCoreGenesis(*argv,MagickTrue);
308 image_info=AcquireImageInfo();
309 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
310 exception=AcquireExceptionInfo();
311 contrast_image=ReadImage(image_info,exception);
312 if (contrast_image == (Image *) NULL)
313 ThrowImageException(contrast_image);
315 Sigmoidal non-linearity contrast control.
317 contrast_view=NewImageView(contrast_image);
318 if (contrast_view == (ImageView *) NULL)
319 ThrowImageException(contrast_image);
320 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
321 if (status == MagickFalse)
322 ThrowImageException(contrast_image);
323 contrast_view=DestroyImageView(contrast_view);
325 Write the image then destroy it.
327 status=WriteImages(image_info,contrast_image,argv[2],exception);
328 if (status == MagickFalse)
329 ThrowImageException(contrast_image);
330 contrast_image=DestroyImage(contrast_image);
331 exception=DestroyExceptionInfo(exception);
332 image_info=DestroyImageInfo(image_info);
333 MagickCoreTerminus();
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