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174 <h1>MagickWand C API</h1>
176 <div class="doc-section">
177 <p>The <a href="../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="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>
180 <li><a href="../api/magick-wand.html">Magick Wand Methods</a></li>
181 <li><a href="../api/magick-property.html">Set or Get Magick Wand Properties</a></li>
182 <li><a href="../api/magick-image.html">Magick Wand Image Methods</a></li>
183 <li><a href="../api/pixel-iterator.html">Pixel Iterator Methods</a></li>
184 <li><a href="../api/pixel-wand.html">Pixel Wand Methods</a></li>
185 <li><a href="../api/drawing-wand.html">Image Vector Drawing</a></li>
186 <li><a href="../api/mogrify.html">Command-line Interface</a></li>
187 <li><a href="../api/wand-view.html">Wand View Methods</a></li>
188 <li><a href="../api/magick-deprecate.html">Deprecated Methods</a></li>
189 <li><a href="exception.html">Error and Warning Codes</a></li>
192 <p>After you write your MagickWand program, compile it like this:</p>
194 <p class="crt"><span class="crtprompt"> $magick> </span><span class="crtin">cc -o wand `pkg-config --cflags --libs MagickWand` wand.c</span></p>
195 <p>Set the <code>PKG_CONFIG_PATH</code> environment variable if ImageMagick is not in your default system path:</p>
196 <p class="crt"><span class="crtprompt"> $magick> </span><span class="crtin">export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig</span></p>
197 <p>Here is a example program that utilizes the MagickWand API to get you started, <a href="../source/wand.c">wand.c</a>. It reads an image, creates a thumbnail, and writes the result to disk.</p>
199 <div class="viewport">
200 #include <stdio.h>
201 #include <stdlib.h>
202 #include <wand/MagickWand.h>
204 int main(int argc,char **argv)
206 #define ThrowWandException(wand) \
214 description=MagickGetException(wand,&severity); \
215 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
216 description=(char *) MagickRelinquishMemory(description); \
228 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
235 magick_wand=NewMagickWand();
236 status=MagickReadImage(magick_wand,argv[1]);
237 if (status == MagickFalse)
238 ThrowWandException(magick_wand);
240 Turn the images into a thumbnail sequence.
242 MagickResetIterator(magick_wand);
243 while (MagickNextImage(magick_wand) != MagickFalse)
244 MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
246 Write the image then destroy it.
248 status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
249 if (status == MagickFalse)
250 ThrowWandException(magick_wand);
251 magick_wand=DestroyMagickWand(magick_wand);
252 MagickWandTerminus();
257 <p>Here is another program that shows one way to get and set image pixels with the MagickWand API, <a href="../source/contrast.c">contrast.c</a>. It reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk.</p>
259 <div class="viewport">
260 #include <stdio.h>
261 #include <stdlib.h>
262 #include <math.h>
263 #include <wand/MagickWand.h>
265 int main(int argc,char **argv)
267 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
268 #define SigmoidalContrast(x) \
269 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
270 #define ThrowWandException(wand) \
278 description=MagickGetException(wand,&severity); \
279 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
280 description=(char *) MagickRelinquishMemory(description); \
313 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
320 image_wand=NewMagickWand();
321 status=MagickReadImage(image_wand,argv[1]);
322 if (status == MagickFalse)
323 ThrowWandException(image_wand);
324 contrast_wand=CloneMagickWand(image_wand);
326 Sigmoidal non-linearity contrast control.
328 iterator=NewPixelIterator(image_wand);
329 contrast_iterator=NewPixelIterator(contrast_wand);
330 if ((iterator == (PixelIterator *) NULL) ||
331 (contrast_iterator == (PixelIterator *) NULL))
332 ThrowWandException(image_wand);
333 for (y=0; y < (long) MagickGetImageHeight(image_wand); y++)
335 pixels=PixelGetNextIteratorRow(iterator,&width);
336 contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
337 if ((pixels == (PixelWand **) NULL) ||
338 (contrast_pixels == (PixelWand **) NULL))
340 for (x=0; x < (long) width; x++)
342 PixelGetMagickColor(pixels[x],&pixel);
343 pixel.red=SigmoidalContrast(pixel.red);
344 pixel.green=SigmoidalContrast(pixel.green);
345 pixel.blue=SigmoidalContrast(pixel.blue);
346 pixel.index=SigmoidalContrast(pixel.index);
347 PixelSetMagickColor(contrast_pixels[x],&pixel);
349 (void) PixelSyncIterator(contrast_iterator);
351 if (y < (long) MagickGetImageHeight(image_wand))
352 ThrowWandException(image_wand);
353 contrast_iterator=DestroyPixelIterator(contrast_iterator);
354 iterator=DestroyPixelIterator(iterator);
355 image_wand=DestroyMagickWand(image_wand);
357 Write the image then destroy it.
359 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
360 if (status == MagickFalse)
361 ThrowWandException(image_wand);
362 contrast_wand=DestroyMagickWand(contrast_wand);
363 MagickWandTerminus();
367 <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="../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>
369 <div class="viewport">
370 #include <stdio.h>
371 #include <stdlib.h>
372 #include <math.h>
373 #include <wand/MagickWand.h>
375 static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
376 const ssize_t y,const int id,void *context)
378 #define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
379 #define SigmoidalContrast(x) \
380 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
394 extent=GetWandViewExtent(contrast_view);
395 pixels=GetWandViewPixels(contrast_view);
396 for (x=0; x < (long) (extent.width-extent.height); x++)
398 PixelGetMagickColor(pixels[x],&pixel);
399 pixel.red=SigmoidalContrast(pixel.red);
400 pixel.green=SigmoidalContrast(pixel.green);
401 pixel.blue=SigmoidalContrast(pixel.blue);
402 pixel.index=SigmoidalContrast(pixel.index);
403 PixelSetMagickColor(contrast_pixels[x],&pixel);
408 int main(int argc,char **argv)
410 #define ThrowViewException(view) \
412 description=GetWandViewException(view,&severity); \
413 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
414 description=(char *) MagickRelinquishMemory(description); \
417 #define ThrowWandException(wand) \
419 description=MagickGetException(wand,&severity); \
420 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
421 description=(char *) MagickRelinquishMemory(description); \
445 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
452 contrast_wand=NewMagickWand();
453 status=MagickReadImage(contrast_wand,argv[1]);
454 if (status == MagickFalse)
455 ThrowWandException(contrast_wand);
457 Sigmoidal non-linearity contrast control.
459 contrast_view=NewWandView(contrast_wand);
460 if (contrast_view == (WandView *) NULL)
461 ThrowWandException(contrast_wand);
462 status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
463 if (status == MagickFalse)
464 ThrowWandException(contrast_wand);
465 contrast_view=DestroyWandView(contrast_view);
467 Write the image then destroy it.
469 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
470 if (status == MagickFalse)
471 ThrowWandException(contrast_wand);
472 contrast_wand=DestroyMagickWand(contrast_wand);
473 MagickWandTerminus();
477 <p><a href="http://members.shaw.ca/el.supremo/MagickWand/">MagickWand Examples in C</a> illustrates how to use the ImageMagick MagickWand API. Each example is presented as a C function, complete with headers, so that it can be copied to a file and then included in your own C project.</p>
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