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171 <p class="navigation-index"></p>
173 <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>
176 <li><a href="../www/api/magick-wand.html">Magick Wand Methods</a></li>
177 <li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
178 <li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
179 <li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
180 <li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
181 <li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
182 <li><a href="../www/api/wand-view.html">Wand View Methods</a></li>
183 <li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
184 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
188 <p>After you write your MagickWand program, compile it like this:</p>
190 <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>cc `MagickWand-config --cflags --cppflags` -O2 -o wand wand.c \ <br/> `MagickWand-config --ldflags --libs`</span></p>
191 <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>
193 <div class="viewport">
195 #include <stdio.h>
196 #include <stdlib.h>
197 #include <wand/MagickWand.h>
199 int main(int argc,char **argv)
201 #define ThrowWandException(wand) \
209 description=MagickGetException(wand,&severity); \
210 (void) fprintf(stderr,"%s %s %u %s\n",GetMagickModule(),description); \
211 description=(char *) MagickRelinquishMemory(description); \
223 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
230 magick_wand=NewMagickWand();
231 status=MagickReadImage(magick_wand,argv[1]);
232 if (status == MagickFalse)
233 ThrowWandException(magick_wand);
235 Turn the images into a thumbnail sequence.
237 MagickResetIterator(magick_wand);
238 while (MagickNextImage(magick_wand) != MagickFalse)
239 MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
241 Write the image then destroy it.
243 status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
244 if (status == MagickFalse)
245 ThrowWandException(magick_wand);
246 magick_wand=DestroyMagickWand(magick_wand);
247 MagickWandTerminus();
253 <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>
255 <div class="viewport">
257 #include <stdio.h>
258 #include <stdlib.h>
260 #include <wand/MagickWand.h>
262 int main(int argc,char **argv)
264 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
265 #define SigmoidalContrast(x) \
266 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
267 #define ThrowWandException(wand) \
275 description=MagickGetException(wand,&severity); \
276 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
277 description=(char *) MagickRelinquishMemory(description); \
310 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
317 image_wand=NewMagickWand();
318 status=MagickReadImage(image_wand,argv[1]);
319 if (status == MagickFalse)
320 ThrowWandException(image_wand);
321 contrast_wand=CloneMagickWand(image_wand);
323 Sigmoidal non-linearity contrast control.
325 iterator=NewPixelIterator(image_wand);
326 contrast_iterator=NewPixelIterator(contrast_wand);
327 if ((iterator == (PixelIterator *) NULL) ||
328 (contrast_iterator == (PixelIterator *) NULL))
329 ThrowWandException(image_wand);
330 for (y=0; y < (long) MagickGetImageHeight(image_wand); y++)
332 pixels=PixelGetNextIteratorRow(iterator,&width);
333 contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
334 if ((pixels == (PixelWand **) NULL) ||
335 (contrast_pixels == (PixelWand **) NULL))
337 for (x=0; x < (long) width; x++)
339 PixelGetMagickColor(pixels[x],&pixel);
340 pixel.red=SigmoidalContrast(pixel.red);
341 pixel.green=SigmoidalContrast(pixel.green);
342 pixel.blue=SigmoidalContrast(pixel.blue);
343 pixel.index=SigmoidalContrast(pixel.index);
344 PixelSetMagickColor(contrast_pixels[x],&pixel);
346 (void) PixelSyncIterator(contrast_iterator);
348 if (y < (long) MagickGetImageHeight(image_wand))
349 ThrowWandException(image_wand);
350 contrast_iterator=DestroyPixelIterator(contrast_iterator);
351 iterator=DestroyPixelIterator(iterator);
352 image_wand=DestroyMagickWand(image_wand);
354 Write the image then destroy it.
356 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
357 if (status == MagickFalse)
358 ThrowWandException(image_wand);
359 contrast_wand=DestroyMagickWand(contrast_wand);
360 MagickWandTerminus();
365 <p><a name="wand-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="../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>
367 <div class="viewport">
369 #include <stdio.h>
370 #include <stdlib.h>
372 #include <wand/MagickWand.h>
374 static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
375 const ssize_t y,const int id,void *context)
377 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
378 #define SigmoidalContrast(x) \
379 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
393 extent=GetWandViewExtent(contrast_view);
394 pixels=GetWandViewPixels(contrast_view);
395 for (x=0; x < (long) (extent.width-extent.height); x++)
397 PixelGetMagickColor(pixels[x],&pixel);
398 pixel.red=SigmoidalContrast(pixel.red);
399 pixel.green=SigmoidalContrast(pixel.green);
400 pixel.blue=SigmoidalContrast(pixel.blue);
401 pixel.index=SigmoidalContrast(pixel.index);
402 PixelSetMagickColor(contrast_pixels[x],&pixel);
407 int main(int argc,char **argv)
409 #define ThrowViewException(view) \
411 description=GetWandViewException(view,&severity); \
412 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
413 description=(char *) MagickRelinquishMemory(description); \
416 #define ThrowWandException(wand) \
418 description=MagickGetException(wand,&severity); \
419 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
420 description=(char *) MagickRelinquishMemory(description); \
444 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
451 contrast_wand=NewMagickWand();
452 status=MagickReadImage(contrast_wand,argv[1]);
453 if (status == MagickFalse)
454 ThrowWandException(contrast_wand);
456 Sigmoidal non-linearity contrast control.
458 contrast_view=NewWandView(contrast_wand);
459 if (contrast_view == (WandView *) NULL)
460 ThrowWandException(contrast_wand);
461 status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
462 if (status == MagickFalse)
463 ThrowWandException(contrast_wand);
464 contrast_view=DestroyWandView(contrast_view);
466 Write the image then destroy it.
468 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
469 if (status == MagickFalse)
470 ThrowWandException(contrast_wand);
471 contrast_wand=DestroyMagickWand(contrast_wand);
472 MagickWandTerminus();
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