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56 <p class="lead magick-description">The <a href="http://nextgen.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>
59 <li><a href="api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
60 <li><a href="api/constitute.html">Constitute an Image</a></li>
61 <li><a href="api/composite.html">Composite an Image</a></li>
62 <li><a href="api/image.html">Image Methods</a></li>
63 <li><a href="api/channel.html">Image Channel Methods</a></li>
64 <li><a href="api/color.html">Count the Colors in an Image</a></li>
65 <li><a href="api/colormap.html">Colormap Methods</a></li>
66 <li><a href="api/colorspace.html">Colorspace Methods</a></li>
67 <li><a href="api/distort.html">Image Distortions</a></li>
68 <li><a href="api/layer.html">Dealing with Image Layers</a></li>
69 <li><a href="api/profile.html">Dealing with Image Profiles</a></li>
70 <li><a href="api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
71 <li><a href="api/histogram.html">Image Histograms</a></li>
72 <li><a href="api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
73 <li><a href="api/resize.html">Resize an Image</a></li>
74 <li><a href="api/transform.html">Transform an Image</a></li>
75 <li><a href="api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
76 <li><a href="api/enhance.html">Enhance an Image</a></li>
77 <li><a href="api/effect.html">Add an Effect</a></li>
78 <li><a href="api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
79 <li><a href="api/fx.html">Add a Special Effect</a></li>
80 <li><a href="api/decorate.html">Decorate an Image</a></li>
81 <li><a href="api/attribute.html">Get/Set an Image Attribute</a></li>
82 <li><a href="api/property.html">Get/Set Image Properties</a></li>
83 <li><a href="api/statistic.html">Get Image Statistics</a></li>
84 <li><a href="api/feature.html">Get Image Features</a></li>
85 <li><a href="api/annotate.html">Annotate an Image</a></li>
86 <li><a href="api/paint.html">Paint on an Image</a></li>
87 <li><a href="api/draw.html">Draw on an Image</a></li>
88 <li><a href="api/montage.html">Create an Image Thumbnail</a></li>
89 <li><a href="api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
90 <li><a href="api/compare.html">Compare an Image to a Reconstructed Image</a></li>
91 <li><a href="api/display.html">Interactively Display and Edit an Image</a></li>
92 <li><a href="api/animate.html">Interactively Animate an Image Sequence</a></li>
93 <li><a href="api/cipher.html">Convert to and from Cipher Pixels</a></li>
94 <li><a href="api/list.html">Working with Image Lists</a></li>
95 <li><a href="api/image-view.html">Image View Methods</a></li>
96 <li><a href="api/cache.html">Get or Set Image Pixels</a></li>
97 <li><a href="api/cache-view.html">Working with Cache Views</a></li>
98 <li><a href="api/stream.html">The Pixel FIFO</a></li>
99 <li><a href="api/blob.html">Read or Write Binary Large OBjects</a></li>
100 <li><a href="api/module.html">Loadable Modules</a></li>
101 <li><a href="api/signature.html">Compute a Message Digest for an Image</a></li>
102 <li><a href="api/registry.html">The Image Registry</a></li>
103 <li><a href="api/exception.html">Dealing with Exceptions</a></li>
104 <li><a href="api/memory.html">Memory Allocation</a></li>
105 <li><a href="api/resource.html">Monitor or Limit Resource Consumption</a></li>
106 <li><a href="api/monitor.html">Monitor the Progress of an Image Operation</a></li>
107 <li><a href="api/version.html">Get the Version and Copyrights</a></li>
108 <li><a href="api/mime.html">Mime Methods</a></li>
109 <li><a href="api/deprecate.html">Deprecated Methods</a></li>
110 <li><a href="exception.html">Error and Warning Codes</a></li>
113 <p>After you write your MagickCore program, compile it like this:</p>
116 cc -o core core.c `pkg-config --cflags --libs MagickCore`
119 <p>Set the <code>PKG_CONFIG_PATH</code> environment variable if ImageMagick is not in your default system path:</p>
122 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
125 <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>
127 <pre class="pre-scrollable">#include <stdio.h>
128 #include <stdlib.h>
129 #include <string.h>
131 #include <magick/MagickCore.h>
133 int main(int argc,char **argv)
149 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
153 Initialize the image info structure and read an image.
155 MagickCoreGenesis(*argv,MagickTrue);
156 exception=AcquireExceptionInfo();
157 image_info=CloneImageInfo((ImageInfo *) NULL);
158 (void) strcpy(image_info->filename,argv[1]);
159 images=ReadImage(image_info,exception);
160 if (exception->severity != UndefinedException)
161 CatchException(exception);
162 if (images == (Image *) NULL)
165 Convert the image to a thumbnail.
167 thumbnails=NewImageList();
168 while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
170 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
171 if (resize_image == (Image *) NULL)
172 MagickError(exception->severity,exception->reason,exception->description);
173 (void) AppendImageToList(&thumbnails,resize_image);
177 Write the image thumbnail.
179 (void) strcpy(thumbnails->filename,argv[2]);
180 WriteImage(image_info,thumbnails);
182 Destroy the image thumbnail and exit.
184 thumbnails=DestroyImageList(thumbnails);
185 image_info=DestroyImageInfo(image_info);
186 exception=DestroyExceptionInfo(exception);
187 MagickCoreTerminus();
190 <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>
192 <pre class="pre-scrollable">#include <stdio.h>
193 #include <stdlib.h>
195 #include <magick/MagickCore.h>
197 static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
198 const ssize_t y,const int id,void *context)
200 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
201 #define SigmoidalContrast(x) \
202 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
216 extent=GetImageViewExtent(contrast_view);
217 pixels=GetImageViewAuthenticPixels(contrast_view);
218 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
220 SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
221 SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
222 SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
223 SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
226 indexes=GetImageViewAuthenticIndexes(contrast_view);
227 if (indexes != (IndexPacket *) NULL)
228 for (x=0; x < (ssize_t) (extent.width-extent.x); x++)
229 SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
233 int main(int argc,char **argv)
235 #define ThrowImageException(image) \
238 CatchException(exception); \
239 if (contrast_image != (Image *) NULL) \
240 contrast_image=DestroyImage(contrast_image); \
243 #define ThrowViewException(view) \
251 description=GetImageViewException(view,&severity); \
252 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
253 description=DestroyString(description); \
274 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
280 MagickCoreGenesis(*argv,MagickTrue);
281 image_info=AcquireImageInfo();
282 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
283 exception=AcquireExceptionInfo();
284 contrast_image=ReadImage(image_info,exception);
285 if (contrast_image == (Image *) NULL)
286 ThrowImageException(contrast_image);
288 Sigmoidal non-linearity contrast control.
290 contrast_view=NewImageView(contrast_image);
291 if (contrast_view == (ImageView *) NULL)
292 ThrowImageException(contrast_image);
293 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
294 if (status == MagickFalse)
295 ThrowImageException(contrast_image);
296 contrast_view=DestroyImageView(contrast_view);
298 Write the image then destroy it.
300 status=WriteImages(image_info,contrast_image,argv[2],exception);
301 if (status == MagickFalse)
302 ThrowImageException(contrast_image);
303 contrast_image=DestroyImage(contrast_image);
304 exception=DestroyExceptionInfo(exception);
305 image_info=DestroyImageInfo(image_info);
306 MagickCoreTerminus();
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