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cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]193<h1>Module effect Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]194<p class="navigation-index">[<a href="#AdaptiveBlurImage">AdaptiveBlurImage</a> &bull; <a href="#AdaptiveSharpenImage">AdaptiveSharpenImage</a> &bull; <a href="#BlurImage">BlurImage</a> &bull; <a href="#ConvolveImage">ConvolveImage</a> &bull; <a href="#DespeckleImage">DespeckleImage</a> &bull; <a href="#EdgeImage">EdgeImage</a> &bull; <a href="#EmbossImage">EmbossImage</a> &bull; <a href="#FilterImage">FilterImage</a> &bull; <a href="#GaussianBlurImage">GaussianBlurImage</a> &bull; <a href="#MedianFilterImage">MedianFilterImage</a> &bull; <a href="#MotionBlurImage">MotionBlurImage</a> &bull; <a href="#PreviewImage">PreviewImage</a> &bull; <a href="#RadialBlurImage">RadialBlurImage</a> &bull; <a href="#ReduceNoiseImage">ReduceNoiseImage</a> &bull; <a href="#SelectiveBlurImage">SelectiveBlurImage</a> &bull; <a href="#ShadeImage">ShadeImage</a> &bull; <a href="#SharpenImage">SharpenImage</a> &bull; <a href="#SpreadImage">SpreadImage</a> &bull; <a href="#UnsharpMaskImage">UnsharpMaskImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]196<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveBlurImage">AdaptiveBlurImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<div class="doc-section">
198
199<p>AdaptiveBlurImage() adaptively blurs the image by blurring less intensely near image edges and more intensely far from edges. We blur the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and AdaptiveBlurImage() selects a suitable radius for you.</p>
200
201<p>The format of the AdaptiveBlurImage method is:</p>
202
203<pre class="code">
204 Image *AdaptiveBlurImage(const Image *image,const double radius,
205 const double sigma,ExceptionInfo *exception)
206 Image *AdaptiveBlurImageChannel(const Image *image,
207 const ChannelType channel,double radius,const double sigma,
208 ExceptionInfo *exception)
209</pre>
210
211<p>A description of each parameter follows:</p>
212
213<h5>image</h5>
214<p>the image.</p>
215
216<h5>channel</h5>
217<p>the channel type.</p>
218
219<h5>radius</h5>
220<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
221
222<h5>sigma</h5>
223<p>the standard deviation of the Laplacian, in pixels.</p>
224
225<h5>exception</h5>
226<p>return any errors or warnings in this structure.</p>
227
228 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]229<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveSharpenImage">AdaptiveSharpenImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]230<div class="doc-section">
231
232<p>AdaptiveSharpenImage() adaptively sharpens the image by sharpening more intensely near image edges and less intensely far from edges. We sharpen the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and AdaptiveSharpenImage() selects a suitable radius for you.</p>
233
234<p>The format of the AdaptiveSharpenImage method is:</p>
235
236<pre class="code">
237 Image *AdaptiveSharpenImage(const Image *image,const double radius,
238 const double sigma,ExceptionInfo *exception)
239 Image *AdaptiveSharpenImageChannel(const Image *image,
240 const ChannelType channel,double radius,const double sigma,
241 ExceptionInfo *exception)
242</pre>
243
244<p>A description of each parameter follows:</p>
245
246<h5>image</h5>
247<p>the image.</p>
248
249<h5>channel</h5>
250<p>the channel type.</p>
251
252<h5>radius</h5>
253<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
254
255<h5>sigma</h5>
256<p>the standard deviation of the Laplacian, in pixels.</p>
257
258<h5>exception</h5>
259<p>return any errors or warnings in this structure.</p>
260
261 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]262<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="BlurImage">BlurImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]263<div class="doc-section">
264
265<p>BlurImage() blurs an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, the radius should be larger than sigma. Use a radius of 0 and BlurImage() selects a suitable radius for you.</p>
266
267<p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p>
268
269<p>The format of the BlurImage method is:</p>
270
271<pre class="code">
272 Image *BlurImage(const Image *image,const double radius,
273 const double sigma,ExceptionInfo *exception)
274 Image *BlurImageChannel(const Image *image,const ChannelType channel,
275 const double radius,const double sigma,ExceptionInfo *exception)
276</pre>
277
278<p>A description of each parameter follows:</p>
279
280<h5>image</h5>
281<p>the image.</p>
282
283<h5>channel</h5>
284<p>the channel type.</p>
285
286<h5>radius</h5>
287<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
288
289<h5>sigma</h5>
290<p>the standard deviation of the Gaussian, in pixels.</p>
291
292<h5>exception</h5>
293<p>return any errors or warnings in this structure.</p>
294
295 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]296<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ConvolveImage">ConvolveImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]297<div class="doc-section">
298
299<p>ConvolveImage() applies a custom convolution kernel to the image.</p>
300
301<p>The format of the ConvolveImage method is:</p>
302
303<pre class="code">
304 Image *ConvolveImage(const Image *image,const size_t order,
305 const double *kernel,ExceptionInfo *exception)
306 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
307 const size_t order,const double *kernel,ExceptionInfo *exception)
308</pre>
309
310<p>A description of each parameter follows:</p>
311
312<h5>image</h5>
313<p>the image.</p>
314
315<h5>channel</h5>
316<p>the channel type.</p>
317
318<h5>order</h5>
319<p>the number of columns and rows in the filter kernel.</p>
320
321<h5>kernel</h5>
322<p>An array of double representing the convolution kernel.</p>
323
324<h5>exception</h5>
325<p>return any errors or warnings in this structure.</p>
326
327 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]328<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="DespeckleImage">DespeckleImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]329<div class="doc-section">
330
331<p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p>
332
333<p>The format of the DespeckleImage method is:</p>
334
335<pre class="code">
336 Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
337</pre>
338
339<p>A description of each parameter follows:</p>
340
341<h5>image</h5>
342<p>the image.</p>
343
344<h5>exception</h5>
345<p>return any errors or warnings in this structure.</p>
346
347 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]348<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EdgeImage">EdgeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]349<div class="doc-section">
350
351<p>EdgeImage() finds edges in an image. Radius defines the radius of the convolution filter. Use a radius of 0 and EdgeImage() selects a suitable radius for you.</p>
352
353<p>The format of the EdgeImage method is:</p>
354
355<pre class="code">
356 Image *EdgeImage(const Image *image,const double radius,
357 ExceptionInfo *exception)
358</pre>
359
360<p>A description of each parameter follows:</p>
361
362<h5>image</h5>
363<p>the image.</p>
364
365<h5>radius</h5>
366<p>the radius of the pixel neighborhood.</p>
367
368<h5>exception</h5>
369<p>return any errors or warnings in this structure.</p>
370
371 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]372<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EmbossImage">EmbossImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]373<div class="doc-section">
374
375<p>EmbossImage() returns a grayscale image with a three-dimensional effect. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and Emboss() selects a suitable radius for you.</p>
376
377<p>The format of the EmbossImage method is:</p>
378
379<pre class="code">
380 Image *EmbossImage(const Image *image,const double radius,
381 const double sigma,ExceptionInfo *exception)
382</pre>
383
384<p>A description of each parameter follows:</p>
385
386<h5>image</h5>
387<p>the image.</p>
388
389<h5>radius</h5>
390<p>the radius of the pixel neighborhood.</p>
391
392<h5>sigma</h5>
393<p>the standard deviation of the Gaussian, in pixels.</p>
394
395<h5>exception</h5>
396<p>return any errors or warnings in this structure.</p>
397
398 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]399<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="FilterImage">FilterImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]400<div class="doc-section">
401
402<p>FilterImage() applies a custom convolution kernel to the image.</p>
403
404<p>The format of the FilterImage method is:</p>
405
406<pre class="code">
407 Image *FilterImage(const Image *image,const KernelInfo *kernel,
408 ExceptionInfo *exception)
409 Image *FilterImageChannel(const Image *image,const ChannelType channel,
410 const KernelInfo *kernel,ExceptionInfo *exception)
411</pre>
412
413<p>A description of each parameter follows:</p>
414
415<h5>image</h5>
416<p>the image.</p>
417
418<h5>channel</h5>
419<p>the channel type.</p>
420
421<h5>kernel</h5>
422<p>the filtering kernel.</p>
423
424<h5>exception</h5>
425<p>return any errors or warnings in this structure.</p>
426
427 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]428<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="GaussianBlurImage">GaussianBlurImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]429<div class="doc-section">
430
431<p>GaussianBlurImage() blurs an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, the radius should be larger than sigma. Use a radius of 0 and GaussianBlurImage() selects a suitable radius for you</p>
432
433<p>The format of the GaussianBlurImage method is:</p>
434
435<pre class="code">
436 Image *GaussianBlurImage(const Image *image,onst double radius,
437 const double sigma,ExceptionInfo *exception)
438 Image *GaussianBlurImageChannel(const Image *image,
439 const ChannelType channel,const double radius,const double sigma,
440 ExceptionInfo *exception)
441</pre>
442
443<p>A description of each parameter follows:</p>
444
445<h5>image</h5>
446<p>the image.</p>
447
448<h5>channel</h5>
449<p>the channel type.</p>
450
451<h5>radius</h5>
452<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
453
454<h5>sigma</h5>
455<p>the standard deviation of the Gaussian, in pixels.</p>
456
457<h5>exception</h5>
458<p>return any errors or warnings in this structure.</p>
459
460 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]461<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="MedianFilterImage">MedianFilterImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]462<div class="doc-section">
463
464<p>MedianFilterImage() applies a digital filter that improves the quality of a noisy image. Each pixel is replaced by the median in a set of neighboring pixels as defined by radius.</p>
465
466<p>The algorithm was contributed by Mike Edmonds and implements an insertion sort for selecting median color-channel values. For more on this algorithm see "Skip Lists: A probabilistic Alternative to Balanced Trees" by William Pugh in the June 1990 of Communications of the ACM.</p>
467
468<p>The format of the MedianFilterImage method is:</p>
469
470<pre class="code">
471 Image *MedianFilterImage(const Image *image,const double radius,
472 ExceptionInfo *exception)
473</pre>
474
475<p>A description of each parameter follows:</p>
476
477<h5>image</h5>
478<p>the image.</p>
479
480<h5>radius</h5>
481<p>the radius of the pixel neighborhood.</p>
482
483<h5>exception</h5>
484<p>return any errors or warnings in this structure.</p>
485
486 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]487<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="MotionBlurImage">MotionBlurImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]488<div class="doc-section">
489
490<p>MotionBlurImage() simulates motion blur. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and MotionBlurImage() selects a suitable radius for you. Angle gives the angle of the blurring motion.</p>
491
492<p>Andrew Protano contributed this effect.</p>
493
494<p>The format of the MotionBlurImage method is:</p>
495
496<pre class="code">
497 Image *MotionBlurImage(const Image *image,const double radius,
498 const double sigma,const double angle,ExceptionInfo *exception)
499 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
500 const double radius,const double sigma,const double angle,
501 ExceptionInfo *exception)
502</pre>
503
504<p>A description of each parameter follows:</p>
505
506<h5>image</h5>
507<p>the image.</p>
508
509<h5>channel</h5>
510<p>the channel type.</p>
511
512<h5>radius</h5>
513<p>the radius of the Gaussian, in pixels, not counting the center</p>
514<h5>radius</h5>
515<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
516
517<h5>sigma</h5>
518<p>the standard deviation of the Gaussian, in pixels.</p>
519
520<h5>angle</h5>
521<p>Apply the effect along this angle.</p>
522
523<h5>exception</h5>
524<p>return any errors or warnings in this structure.</p>
525
526 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]527<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="PreviewImage">PreviewImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]528<div class="doc-section">
529
530<p>PreviewImage() tiles 9 thumbnails of the specified image with an image processing operation applied with varying parameters. This may be helpful pin-pointing an appropriate parameter for a particular image processing operation.</p>
531
532<p>The format of the PreviewImages method is:</p>
533
534<pre class="code">
535 Image *PreviewImages(const Image *image,const PreviewType preview,
536 ExceptionInfo *exception)
537</pre>
538
539<p>A description of each parameter follows:</p>
540
541<h5>image</h5>
542<p>the image.</p>
543
544<h5>preview</h5>
545<p>the image processing operation.</p>
546
547<h5>exception</h5>
548<p>return any errors or warnings in this structure.</p>
549
550 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]551<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="RadialBlurImage">RadialBlurImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]552<div class="doc-section">
553
554<p>RadialBlurImage() applies a radial blur to the image.</p>
555
556<p>Andrew Protano contributed this effect.</p>
557
558<p>The format of the RadialBlurImage method is:</p>
559
560<pre class="code">
561 Image *RadialBlurImage(const Image *image,const double angle,
562 ExceptionInfo *exception)
563 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
564 const double angle,ExceptionInfo *exception)
565</pre>
566
567<p>A description of each parameter follows:</p>
568
569<h5>image</h5>
570<p>the image.</p>
571
572<h5>channel</h5>
573<p>the channel type.</p>
574
575<h5>angle</h5>
576<p>the angle of the radial blur.</p>
577
578<h5>exception</h5>
579<p>return any errors or warnings in this structure.</p>
580
581 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]582<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ReduceNoiseImage">ReduceNoiseImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]583<div class="doc-section">
584
585<p>ReduceNoiseImage() smooths the contours of an image while still preserving edge information. The algorithm works by replacing each pixel with its neighbor closest in value. A neighbor is defined by radius. Use a radius of 0 and ReduceNoise() selects a suitable radius for you.</p>
586
587<p>The format of the ReduceNoiseImage method is:</p>
588
589<pre class="code">
590 Image *ReduceNoiseImage(const Image *image,const double radius,
591 ExceptionInfo *exception)
592</pre>
593
594<p>A description of each parameter follows:</p>
595
596<h5>image</h5>
597<p>the image.</p>
598
599<h5>radius</h5>
600<p>the radius of the pixel neighborhood.</p>
601
602<h5>exception</h5>
603<p>return any errors or warnings in this structure.</p>
604
605 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]606<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SelectiveBlurImage">SelectiveBlurImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]607<div class="doc-section">
608
609<p>SelectiveBlurImage() selectively blur pixels within a contrast threshold. It is similar to the unsharpen mask that sharpens everything with contrast above a certain threshold.</p>
610
611<p>The format of the SelectiveBlurImage method is:</p>
612
613<pre class="code">
614 Image *SelectiveBlurImage(const Image *image,const double radius,
615 const double sigma,const double threshold,ExceptionInfo *exception)
616 Image *SelectiveBlurImageChannel(const Image *image,
617 const ChannelType channel,const double radius,const double sigma,
618 const double threshold,ExceptionInfo *exception)
619</pre>
620
621<p>A description of each parameter follows:</p>
622
623<h5>image</h5>
624<p>the image.</p>
625
626<h5>channel</h5>
627<p>the channel type.</p>
628
629<h5>radius</h5>
630<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
631
632<h5>sigma</h5>
633<p>the standard deviation of the Gaussian, in pixels.</p>
634
635<h5>threshold</h5>
636<p>only pixels within this contrast threshold are included in the blur operation.</p>
637
638<h5>exception</h5>
639<p>return any errors or warnings in this structure.</p>
640
641 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]642<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ShadeImage">ShadeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]643<div class="doc-section">
644
645<p>ShadeImage() shines a distant light on an image to create a three-dimensional effect. You control the positioning of the light with azimuth and elevation; azimuth is measured in degrees off the x axis and elevation is measured in pixels above the Z axis.</p>
646
647<p>The format of the ShadeImage method is:</p>
648
649<pre class="code">
650 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
651 const double azimuth,const double elevation,ExceptionInfo *exception)
652</pre>
653
654<p>A description of each parameter follows:</p>
655
656<h5>image</h5>
657<p>the image.</p>
658
659<h5>gray</h5>
660<p>A value other than zero shades the intensity of each pixel.</p>
661
662<h5>azimuth, elevation</h5>
663<p>Define the light source direction.</p>
664
665<h5>exception</h5>
666<p>return any errors or warnings in this structure.</p>
667
668 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]669<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SharpenImage">SharpenImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]670<div class="doc-section">
671
672<p>SharpenImage() sharpens the image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and SharpenImage() selects a suitable radius for you.</p>
673
674<p>Using a separable kernel would be faster, but the negative weights cancel out on the corners of the kernel producing often undesirable ringing in the filtered result; this can be avoided by using a 2D gaussian shaped image sharpening kernel instead.</p>
675
676<p>The format of the SharpenImage method is:</p>
677
678<pre class="code">
679 Image *SharpenImage(const Image *image,const double radius,
680 const double sigma,ExceptionInfo *exception)
681 Image *SharpenImageChannel(const Image *image,const ChannelType channel,
682 const double radius,const double sigma,ExceptionInfo *exception)
683</pre>
684
685<p>A description of each parameter follows:</p>
686
687<h5>image</h5>
688<p>the image.</p>
689
690<h5>channel</h5>
691<p>the channel type.</p>
692
693<h5>radius</h5>
694<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
695
696<h5>sigma</h5>
697<p>the standard deviation of the Laplacian, in pixels.</p>
698
699<h5>exception</h5>
700<p>return any errors or warnings in this structure.</p>
701
702 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]703<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SpreadImage">SpreadImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]704<div class="doc-section">
705
706<p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p>
707
708<p>The format of the SpreadImage method is:</p>
709
710<pre class="code">
711 Image *SpreadImage(const Image *image,const double radius,
712 ExceptionInfo *exception)
713</pre>
714
715<p>A description of each parameter follows:</p>
716
717<h5>image</h5>
718<p>the image.</p>
719
720<h5>radius</h5>
721<p>Choose a random pixel in a neighborhood of this extent.</p>
722
723<h5>exception</h5>
724<p>return any errors or warnings in this structure.</p>
725
726 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]727<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="UnsharpMaskImage">UnsharpMaskImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]728<div class="doc-section">
729
730<p>UnsharpMaskImage() sharpens one or more image channels. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and UnsharpMaskImage() selects a suitable radius for you.</p>
731
732<p>The format of the UnsharpMaskImage method is:</p>
733
734<pre class="code">
735 Image *UnsharpMaskImage(const Image *image,const double radius,
736 const double sigma,const double amount,const double threshold,
737 ExceptionInfo *exception)
738 Image *UnsharpMaskImageChannel(const Image *image,
739 const ChannelType channel,const double radius,const double sigma,
740 const double amount,const double threshold,ExceptionInfo *exception)
741</pre>
742
743<p>A description of each parameter follows:</p>
744
745<h5>image</h5>
746<p>the image.</p>
747
748<h5>channel</h5>
749<p>the channel type.</p>
750
751<h5>radius</h5>
752<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
753
754<h5>sigma</h5>
755<p>the standard deviation of the Gaussian, in pixels.</p>
756
757<h5>amount</h5>
758<p>the percentage of the difference between the original and the blur image that is added back into the original.</p>
759
760<h5>threshold</h5>
761<p>the threshold in pixels needed to apply the diffence amount.</p>
762
763<h5>exception</h5>
764<p>return any errors or warnings in this structure.</p>
765
766 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]767
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