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200 <h1>MagickWand C API</h1>
202 <div class="doc-section">
203 <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>
206 <li><a href="../www/api/magick-wand.html">Magick Wand Methods</a></li>
207 <li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
208 <li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
209 <li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
210 <li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
211 <li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
212 <li><a href="../www/api/mogrify.html">Command-line Interface</a></li>
213 <li><a href="../www/api/wand-view.html">Wand View Methods</a></li>
214 <li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
215 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
218 <p>After you write your MagickWand program, compile it like this:</p>
220 <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>
221 <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>
223 <div class="viewport">
225 #include <stdio.h>
226 #include <stdlib.h>
227 #include <wand/MagickWand.h>
229 int main(int argc,char **argv)
231 #define ThrowWandException(wand) \
239 description=MagickGetException(wand,&severity); \
240 (void) fprintf(stderr,"%s %s %u %s\n",GetMagickModule(),description); \
241 description=(char *) MagickRelinquishMemory(description); \
253 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
260 magick_wand=NewMagickWand();
261 status=MagickReadImage(magick_wand,argv[1]);
262 if (status == MagickFalse)
263 ThrowWandException(magick_wand);
265 Turn the images into a thumbnail sequence.
267 MagickResetIterator(magick_wand);
268 while (MagickNextImage(magick_wand) != MagickFalse)
269 MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
271 Write the image then destroy it.
273 status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
274 if (status == MagickFalse)
275 ThrowWandException(magick_wand);
276 magick_wand=DestroyMagickWand(magick_wand);
277 MagickWandTerminus();
283 <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>
285 <div class="viewport">
287 #include <stdio.h>
288 #include <stdlib.h>
290 #include <wand/MagickWand.h>
292 int main(int argc,char **argv)
294 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
295 #define SigmoidalContrast(x) \
296 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
297 #define ThrowWandException(wand) \
305 description=MagickGetException(wand,&severity); \
306 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
307 description=(char *) MagickRelinquishMemory(description); \
340 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
347 image_wand=NewMagickWand();
348 status=MagickReadImage(image_wand,argv[1]);
349 if (status == MagickFalse)
350 ThrowWandException(image_wand);
351 contrast_wand=CloneMagickWand(image_wand);
353 Sigmoidal non-linearity contrast control.
355 iterator=NewPixelIterator(image_wand);
356 contrast_iterator=NewPixelIterator(contrast_wand);
357 if ((iterator == (PixelIterator *) NULL) ||
358 (contrast_iterator == (PixelIterator *) NULL))
359 ThrowWandException(image_wand);
360 for (y=0; y < (long) MagickGetImageHeight(image_wand); y++)
362 pixels=PixelGetNextIteratorRow(iterator,&width);
363 contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
364 if ((pixels == (PixelWand **) NULL) ||
365 (contrast_pixels == (PixelWand **) NULL))
367 for (x=0; x < (long) width; x++)
369 PixelGetMagickColor(pixels[x],&pixel);
370 pixel.red=SigmoidalContrast(pixel.red);
371 pixel.green=SigmoidalContrast(pixel.green);
372 pixel.blue=SigmoidalContrast(pixel.blue);
373 pixel.index=SigmoidalContrast(pixel.index);
374 PixelSetMagickColor(contrast_pixels[x],&pixel);
376 (void) PixelSyncIterator(contrast_iterator);
378 if (y < (long) MagickGetImageHeight(image_wand))
379 ThrowWandException(image_wand);
380 contrast_iterator=DestroyPixelIterator(contrast_iterator);
381 iterator=DestroyPixelIterator(iterator);
382 image_wand=DestroyMagickWand(image_wand);
384 Write the image then destroy it.
386 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
387 if (status == MagickFalse)
388 ThrowWandException(image_wand);
389 contrast_wand=DestroyMagickWand(contrast_wand);
390 MagickWandTerminus();
395 <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>
397 <div class="viewport">
399 #include <stdio.h>
400 #include <stdlib.h>
402 #include <wand/MagickWand.h>
404 static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
405 const ssize_t y,const int id,void *context)
407 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
408 #define SigmoidalContrast(x) \
409 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
423 extent=GetWandViewExtent(contrast_view);
424 pixels=GetWandViewPixels(contrast_view);
425 for (x=0; x < (long) (extent.width-extent.height); x++)
427 PixelGetMagickColor(pixels[x],&pixel);
428 pixel.red=SigmoidalContrast(pixel.red);
429 pixel.green=SigmoidalContrast(pixel.green);
430 pixel.blue=SigmoidalContrast(pixel.blue);
431 pixel.index=SigmoidalContrast(pixel.index);
432 PixelSetMagickColor(contrast_pixels[x],&pixel);
437 int main(int argc,char **argv)
439 #define ThrowViewException(view) \
441 description=GetWandViewException(view,&severity); \
442 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
443 description=(char *) MagickRelinquishMemory(description); \
446 #define ThrowWandException(wand) \
448 description=MagickGetException(wand,&severity); \
449 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
450 description=(char *) MagickRelinquishMemory(description); \
474 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
481 contrast_wand=NewMagickWand();
482 status=MagickReadImage(contrast_wand,argv[1]);
483 if (status == MagickFalse)
484 ThrowWandException(contrast_wand);
486 Sigmoidal non-linearity contrast control.
488 contrast_view=NewWandView(contrast_wand);
489 if (contrast_view == (WandView *) NULL)
490 ThrowWandException(contrast_wand);
491 status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
492 if (status == MagickFalse)
493 ThrowWandException(contrast_wand);
494 contrast_view=DestroyWandView(contrast_view);
496 Write the image then destroy it.
498 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
499 if (status == MagickFalse)
500 ThrowWandException(contrast_wand);
501 contrast_wand=DestroyMagickWand(contrast_wand);
502 MagickWandTerminus();
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