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