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156 <p class="navigation-index"></p>
158 <p>The <a href="../www/api/MagickWand/index.html">MagickWand API</a> is the recommended interface between the C programming language and the ImageMagick image processing libraries. Unlike the <a href="../www/magick-core.html">MagickCore</a> C API, MagickWand uses only a few opaque types. Accessors are available to set or get important wand properties. A description of the MagickWand public methods are found here:</p>
161 <li><a href="../www/api/magick-wand.html">Magick Wand Methods</a></li>
162 <li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
163 <li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
164 <li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
165 <li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
166 <li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
167 <li><a href="../www/api/wand-view.html">Wand View Methods</a></li>
168 <li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
169 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
173 <p>After you write your MagickWand program, compile it like this:</p>
175 <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>cc `MagickWand-config --cflags --cppflags` -o wand wand.c \ <br/> `MagickWand-config --ldflags --libs`</span></p>
176 <p>Here is a example program that utilizes the MagickWand API to get you started, <a href="../www/source/wand.c">wand.c</a>. It reads an image, creates a thumbnail, and writes the result to disk.</p>
178 <div class="viewport">
180 #include <stdio.h>
181 #include <stdlib.h>
182 #include <wand/MagickWand.h>
184 int main(int argc,char **argv)
186 #define ThrowWandException(wand) \
194 description=MagickGetException(wand,&severity); \
195 (void) fprintf(stderr,"%s %s %u %s\n",GetMagickModule(),description); \
196 description=(char *) MagickRelinquishMemory(description); \
208 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
215 magick_wand=NewMagickWand();
216 status=MagickReadImage(magick_wand,argv[1]);
217 if (status == MagickFalse)
218 ThrowWandException(magick_wand);
220 Turn the images into a thumbnail sequence.
222 MagickResetIterator(magick_wand);
223 while (MagickNextImage(magick_wand) != MagickFalse)
224 MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
226 Write the image then destroy it.
228 status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
229 if (status == MagickFalse)
230 ThrowWandException(magick_wand);
231 magick_wand=DestroyMagickWand(magick_wand);
232 MagickWandTerminus();
238 <p>Here is another program that shows one way to get and set image pixels with the MagickWand API, <a href="../www/source/contrast.c">contrast.c</a>. It reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk.</p>
240 <div class="viewport">
242 #include <stdio.h>
243 #include <stdlib.h>
245 #include <wand/MagickWand.h>
247 int main(int argc,char **argv)
249 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
250 #define SigmoidalContrast(x) \
251 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
252 #define ThrowWandException(wand) \
260 description=MagickGetException(wand,&severity); \
261 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
262 description=(char *) MagickRelinquishMemory(description); \
295 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
302 image_wand=NewMagickWand();
303 status=MagickReadImage(image_wand,argv[1]);
304 if (status == MagickFalse)
305 ThrowWandException(image_wand);
306 contrast_wand=CloneMagickWand(image_wand);
308 Sigmoidal non-linearity contrast control.
310 iterator=NewPixelIterator(image_wand);
311 contrast_iterator=NewPixelIterator(contrast_wand);
312 if ((iterator == (PixelIterator *) NULL) ||
313 (contrast_iterator == (PixelIterator *) NULL))
314 ThrowWandException(image_wand);
315 for (y=0; y < (long) MagickGetImageHeight(image_wand); y++)
317 pixels=PixelGetNextIteratorRow(iterator,&width);
318 contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
319 if ((pixels == (PixelWand **) NULL) ||
320 (contrast_pixels == (PixelWand **) NULL))
322 for (x=0; x < (long) width; x++)
324 PixelGetMagickColor(pixels[x],&pixel);
325 pixel.red=SigmoidalContrast(pixel.red);
326 pixel.green=SigmoidalContrast(pixel.green);
327 pixel.blue=SigmoidalContrast(pixel.blue);
328 pixel.index=SigmoidalContrast(pixel.index);
329 PixelSetMagickColor(contrast_pixels[x],&pixel);
331 (void) PixelSyncIterator(contrast_iterator);
333 if (y < (long) MagickGetImageHeight(image_wand))
334 ThrowWandException(image_wand);
335 contrast_iterator=DestroyPixelIterator(contrast_iterator);
336 iterator=DestroyPixelIterator(iterator);
337 image_wand=DestroyMagickWand(image_wand);
339 Write the image then destroy it.
341 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
342 if (status == MagickFalse)
343 ThrowWandException(image_wand);
344 contrast_wand=DestroyMagickWand(contrast_wand);
345 MagickWandTerminus();
350 <p>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="../www/source/wand/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>
352 <div class="viewport">
354 #include <stdio.h>
355 #include <stdlib.h>
357 #include <wand/MagickWand.h>
359 static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
360 const ssize_t y,const int id,void *context)
362 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
363 #define SigmoidalContrast(x) \
364 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
378 extent=GetWandViewExtent(contrast_view);
379 pixels=GetWandViewPixels(contrast_view);
380 for (x=0; x < (long) (extent.width-extent.height); x++)
382 PixelGetMagickColor(pixels[x],&pixel);
383 pixel.red=SigmoidalContrast(pixel.red);
384 pixel.green=SigmoidalContrast(pixel.green);
385 pixel.blue=SigmoidalContrast(pixel.blue);
386 pixel.index=SigmoidalContrast(pixel.index);
387 PixelSetMagickColor(contrast_pixels[x],&pixel);
392 int main(int argc,char **argv)
394 #define ThrowViewException(view) \
396 description=GetWandViewException(view,&severity); \
397 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
398 description=(char *) MagickRelinquishMemory(description); \
401 #define ThrowWandException(wand) \
403 description=MagickGetException(wand,&severity); \
404 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
405 description=(char *) MagickRelinquishMemory(description); \
429 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
436 contrast_wand=NewMagickWand();
437 status=MagickReadImage(contrast_wand,argv[1]);
438 if (status == MagickFalse)
439 ThrowWandException(contrast_wand);
441 Sigmoidal non-linearity contrast control.
443 contrast_view=NewWandView(contrast_wand);
444 if (contrast_view == (WandView *) NULL)
445 ThrowWandException(contrast_wand);
446 status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
447 if (status == MagickFalse)
448 ThrowWandException(contrast_wand);
449 contrast_view=DestroyWandView(contrast_view);
451 Write the image then destroy it.
453 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
454 if (status == MagickFalse)
455 ThrowWandException(contrast_wand);
456 contrast_wand=DestroyMagickWand(contrast_wand);
457 MagickWandTerminus();
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