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197 <h1>MagickWand C API</h1>
199 <div class="doc-section">
200 <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>
203 <li><a href="../www/api/magick-wand.html">Magick Wand Methods</a></li>
204 <li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
205 <li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
206 <li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
207 <li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
208 <li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
209 <li><a href="../www/api/mogrify.html">Command-line Interface</a></li>
210 <li><a href="../www/api/wand-view.html">Wand View Methods</a></li>
211 <li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
212 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
215 <p>After you write your MagickWand program, compile it like this:</p>
217 <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>
218 <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>
220 <div class="viewport">
222 #include <stdio.h>
223 #include <stdlib.h>
224 #include <wand/MagickWand.h>
226 int main(int argc,char **argv)
228 #define ThrowWandException(wand) \
236 description=MagickGetException(wand,&severity); \
237 (void) fprintf(stderr,"%s %s %u %s\n",GetMagickModule(),description); \
238 description=(char *) MagickRelinquishMemory(description); \
250 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
257 magick_wand=NewMagickWand();
258 status=MagickReadImage(magick_wand,argv[1]);
259 if (status == MagickFalse)
260 ThrowWandException(magick_wand);
262 Turn the images into a thumbnail sequence.
264 MagickResetIterator(magick_wand);
265 while (MagickNextImage(magick_wand) != MagickFalse)
266 MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
268 Write the image then destroy it.
270 status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
271 if (status == MagickFalse)
272 ThrowWandException(magick_wand);
273 magick_wand=DestroyMagickWand(magick_wand);
274 MagickWandTerminus();
280 <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>
282 <div class="viewport">
284 #include <stdio.h>
285 #include <stdlib.h>
287 #include <wand/MagickWand.h>
289 int main(int argc,char **argv)
291 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
292 #define SigmoidalContrast(x) \
293 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
294 #define ThrowWandException(wand) \
302 description=MagickGetException(wand,&severity); \
303 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
304 description=(char *) MagickRelinquishMemory(description); \
337 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
344 image_wand=NewMagickWand();
345 status=MagickReadImage(image_wand,argv[1]);
346 if (status == MagickFalse)
347 ThrowWandException(image_wand);
348 contrast_wand=CloneMagickWand(image_wand);
350 Sigmoidal non-linearity contrast control.
352 iterator=NewPixelIterator(image_wand);
353 contrast_iterator=NewPixelIterator(contrast_wand);
354 if ((iterator == (PixelIterator *) NULL) ||
355 (contrast_iterator == (PixelIterator *) NULL))
356 ThrowWandException(image_wand);
357 for (y=0; y < (long) MagickGetImageHeight(image_wand); y++)
359 pixels=PixelGetNextIteratorRow(iterator,&width);
360 contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
361 if ((pixels == (PixelWand **) NULL) ||
362 (contrast_pixels == (PixelWand **) NULL))
364 for (x=0; x < (long) width; x++)
366 PixelGetMagickColor(pixels[x],&pixel);
367 pixel.red=SigmoidalContrast(pixel.red);
368 pixel.green=SigmoidalContrast(pixel.green);
369 pixel.blue=SigmoidalContrast(pixel.blue);
370 pixel.index=SigmoidalContrast(pixel.index);
371 PixelSetMagickColor(contrast_pixels[x],&pixel);
373 (void) PixelSyncIterator(contrast_iterator);
375 if (y < (long) MagickGetImageHeight(image_wand))
376 ThrowWandException(image_wand);
377 contrast_iterator=DestroyPixelIterator(contrast_iterator);
378 iterator=DestroyPixelIterator(iterator);
379 image_wand=DestroyMagickWand(image_wand);
381 Write the image then destroy it.
383 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
384 if (status == MagickFalse)
385 ThrowWandException(image_wand);
386 contrast_wand=DestroyMagickWand(contrast_wand);
387 MagickWandTerminus();
392 <p><a id="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>
394 <div class="viewport">
396 #include <stdio.h>
397 #include <stdlib.h>
399 #include <wand/MagickWand.h>
401 static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
402 const ssize_t y,const int id,void *context)
404 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
405 #define SigmoidalContrast(x) \
406 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
420 extent=GetWandViewExtent(contrast_view);
421 pixels=GetWandViewPixels(contrast_view);
422 for (x=0; x < (long) (extent.width-extent.height); x++)
424 PixelGetMagickColor(pixels[x],&pixel);
425 pixel.red=SigmoidalContrast(pixel.red);
426 pixel.green=SigmoidalContrast(pixel.green);
427 pixel.blue=SigmoidalContrast(pixel.blue);
428 pixel.index=SigmoidalContrast(pixel.index);
429 PixelSetMagickColor(contrast_pixels[x],&pixel);
434 int main(int argc,char **argv)
436 #define ThrowViewException(view) \
438 description=GetWandViewException(view,&severity); \
439 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
440 description=(char *) MagickRelinquishMemory(description); \
443 #define ThrowWandException(wand) \
445 description=MagickGetException(wand,&severity); \
446 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
447 description=(char *) MagickRelinquishMemory(description); \
471 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
478 contrast_wand=NewMagickWand();
479 status=MagickReadImage(contrast_wand,argv[1]);
480 if (status == MagickFalse)
481 ThrowWandException(contrast_wand);
483 Sigmoidal non-linearity contrast control.
485 contrast_view=NewWandView(contrast_wand);
486 if (contrast_view == (WandView *) NULL)
487 ThrowWandException(contrast_wand);
488 status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
489 if (status == MagickFalse)
490 ThrowWandException(contrast_wand);
491 contrast_view=DestroyWandView(contrast_view);
493 Write the image then destroy it.
495 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
496 if (status == MagickFalse)
497 ThrowWandException(contrast_wand);
498 contrast_wand=DestroyMagickWand(contrast_wand);
499 MagickWandTerminus();
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