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cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]196<h1>Module effect Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<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]198
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]199<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]200<div class="doc-section">
201
202<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>
203
204<p>The format of the AdaptiveBlurImage method is:</p>
205
206<pre class="code">
207 Image *AdaptiveBlurImage(const Image *image,const double radius,
208 const double sigma,ExceptionInfo *exception)
209 Image *AdaptiveBlurImageChannel(const Image *image,
210 const ChannelType channel,double radius,const double sigma,
211 ExceptionInfo *exception)
212</pre>
213
214<p>A description of each parameter follows:</p>
215
216<h5>image</h5>
217<p>the image.</p>
218
219<h5>channel</h5>
220<p>the channel type.</p>
221
222<h5>radius</h5>
223<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
224
225<h5>sigma</h5>
226<p>the standard deviation of the Laplacian, in pixels.</p>
227
228<h5>exception</h5>
229<p>return any errors or warnings in this structure.</p>
230
231 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]232<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]233<div class="doc-section">
234
235<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>
236
237<p>The format of the AdaptiveSharpenImage method is:</p>
238
239<pre class="code">
240 Image *AdaptiveSharpenImage(const Image *image,const double radius,
241 const double sigma,ExceptionInfo *exception)
242 Image *AdaptiveSharpenImageChannel(const Image *image,
243 const ChannelType channel,double radius,const double sigma,
244 ExceptionInfo *exception)
245</pre>
246
247<p>A description of each parameter follows:</p>
248
249<h5>image</h5>
250<p>the image.</p>
251
252<h5>channel</h5>
253<p>the channel type.</p>
254
255<h5>radius</h5>
256<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
257
258<h5>sigma</h5>
259<p>the standard deviation of the Laplacian, in pixels.</p>
260
261<h5>exception</h5>
262<p>return any errors or warnings in this structure.</p>
263
264 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]265<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]266<div class="doc-section">
267
268<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>
269
270<p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p>
271
272<p>The format of the BlurImage method is:</p>
273
274<pre class="code">
275 Image *BlurImage(const Image *image,const double radius,
276 const double sigma,ExceptionInfo *exception)
277 Image *BlurImageChannel(const Image *image,const ChannelType channel,
278 const double radius,const double sigma,ExceptionInfo *exception)
279</pre>
280
281<p>A description of each parameter follows:</p>
282
283<h5>image</h5>
284<p>the image.</p>
285
286<h5>channel</h5>
287<p>the channel type.</p>
288
289<h5>radius</h5>
290<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
291
292<h5>sigma</h5>
293<p>the standard deviation of the Gaussian, in pixels.</p>
294
295<h5>exception</h5>
296<p>return any errors or warnings in this structure.</p>
297
298 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]299<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]300<div class="doc-section">
301
302<p>ConvolveImage() applies a custom convolution kernel to the image.</p>
303
304<p>The format of the ConvolveImage method is:</p>
305
306<pre class="code">
307 Image *ConvolveImage(const Image *image,const size_t order,
308 const double *kernel,ExceptionInfo *exception)
309 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
310 const size_t order,const double *kernel,ExceptionInfo *exception)
311</pre>
312
313<p>A description of each parameter follows:</p>
314
315<h5>image</h5>
316<p>the image.</p>
317
318<h5>channel</h5>
319<p>the channel type.</p>
320
321<h5>order</h5>
322<p>the number of columns and rows in the filter kernel.</p>
323
324<h5>kernel</h5>
325<p>An array of double representing the convolution kernel.</p>
326
327<h5>exception</h5>
328<p>return any errors or warnings in this structure.</p>
329
330 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]331<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]332<div class="doc-section">
333
334<p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p>
335
336<p>The format of the DespeckleImage method is:</p>
337
338<pre class="code">
339 Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
340</pre>
341
342<p>A description of each parameter follows:</p>
343
344<h5>image</h5>
345<p>the image.</p>
346
347<h5>exception</h5>
348<p>return any errors or warnings in this structure.</p>
349
350 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]351<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]352<div class="doc-section">
353
354<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>
355
356<p>The format of the EdgeImage method is:</p>
357
358<pre class="code">
359 Image *EdgeImage(const Image *image,const double radius,
360 ExceptionInfo *exception)
361</pre>
362
363<p>A description of each parameter follows:</p>
364
365<h5>image</h5>
366<p>the image.</p>
367
368<h5>radius</h5>
369<p>the radius of the pixel neighborhood.</p>
370
371<h5>exception</h5>
372<p>return any errors or warnings in this structure.</p>
373
374 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]375<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]376<div class="doc-section">
377
378<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>
379
380<p>The format of the EmbossImage method is:</p>
381
382<pre class="code">
383 Image *EmbossImage(const Image *image,const double radius,
384 const double sigma,ExceptionInfo *exception)
385</pre>
386
387<p>A description of each parameter follows:</p>
388
389<h5>image</h5>
390<p>the image.</p>
391
392<h5>radius</h5>
393<p>the radius of the pixel neighborhood.</p>
394
395<h5>sigma</h5>
396<p>the standard deviation of the Gaussian, in pixels.</p>
397
398<h5>exception</h5>
399<p>return any errors or warnings in this structure.</p>
400
401 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]402<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]403<div class="doc-section">
404
405<p>FilterImage() applies a custom convolution kernel to the image.</p>
406
407<p>The format of the FilterImage method is:</p>
408
409<pre class="code">
410 Image *FilterImage(const Image *image,const KernelInfo *kernel,
411 ExceptionInfo *exception)
412 Image *FilterImageChannel(const Image *image,const ChannelType channel,
413 const KernelInfo *kernel,ExceptionInfo *exception)
414</pre>
415
416<p>A description of each parameter follows:</p>
417
418<h5>image</h5>
419<p>the image.</p>
420
421<h5>channel</h5>
422<p>the channel type.</p>
423
424<h5>kernel</h5>
425<p>the filtering kernel.</p>
426
427<h5>exception</h5>
428<p>return any errors or warnings in this structure.</p>
429
430 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]431<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]432<div class="doc-section">
433
434<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>
435
436<p>The format of the GaussianBlurImage method is:</p>
437
438<pre class="code">
439 Image *GaussianBlurImage(const Image *image,onst double radius,
440 const double sigma,ExceptionInfo *exception)
441 Image *GaussianBlurImageChannel(const Image *image,
442 const ChannelType channel,const double radius,const double sigma,
443 ExceptionInfo *exception)
444</pre>
445
446<p>A description of each parameter follows:</p>
447
448<h5>image</h5>
449<p>the image.</p>
450
451<h5>channel</h5>
452<p>the channel type.</p>
453
454<h5>radius</h5>
455<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
456
457<h5>sigma</h5>
458<p>the standard deviation of the Gaussian, in pixels.</p>
459
460<h5>exception</h5>
461<p>return any errors or warnings in this structure.</p>
462
463 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]464<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]465<div class="doc-section">
466
467<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>
468
469<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>
470
471<p>The format of the MedianFilterImage method is:</p>
472
473<pre class="code">
474 Image *MedianFilterImage(const Image *image,const double radius,
475 ExceptionInfo *exception)
476</pre>
477
478<p>A description of each parameter follows:</p>
479
480<h5>image</h5>
481<p>the image.</p>
482
483<h5>radius</h5>
484<p>the radius of the pixel neighborhood.</p>
485
486<h5>exception</h5>
487<p>return any errors or warnings in this structure.</p>
488
489 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]490<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]491<div class="doc-section">
492
493<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>
494
495<p>Andrew Protano contributed this effect.</p>
496
497<p>The format of the MotionBlurImage method is:</p>
498
499<pre class="code">
500 Image *MotionBlurImage(const Image *image,const double radius,
501 const double sigma,const double angle,ExceptionInfo *exception)
502 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
503 const double radius,const double sigma,const double angle,
504 ExceptionInfo *exception)
505</pre>
506
507<p>A description of each parameter follows:</p>
508
509<h5>image</h5>
510<p>the image.</p>
511
512<h5>channel</h5>
513<p>the channel type.</p>
514
515<h5>radius</h5>
516<p>the radius of the Gaussian, in pixels, not counting the center</p>
517<h5>radius</h5>
518<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
519
520<h5>sigma</h5>
521<p>the standard deviation of the Gaussian, in pixels.</p>
522
523<h5>angle</h5>
524<p>Apply the effect along this angle.</p>
525
526<h5>exception</h5>
527<p>return any errors or warnings in this structure.</p>
528
529 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]530<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]531<div class="doc-section">
532
533<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>
534
535<p>The format of the PreviewImages method is:</p>
536
537<pre class="code">
538 Image *PreviewImages(const Image *image,const PreviewType preview,
539 ExceptionInfo *exception)
540</pre>
541
542<p>A description of each parameter follows:</p>
543
544<h5>image</h5>
545<p>the image.</p>
546
547<h5>preview</h5>
548<p>the image processing operation.</p>
549
550<h5>exception</h5>
551<p>return any errors or warnings in this structure.</p>
552
553 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]554<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]555<div class="doc-section">
556
557<p>RadialBlurImage() applies a radial blur to the image.</p>
558
559<p>Andrew Protano contributed this effect.</p>
560
561<p>The format of the RadialBlurImage method is:</p>
562
563<pre class="code">
564 Image *RadialBlurImage(const Image *image,const double angle,
565 ExceptionInfo *exception)
566 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
567 const double angle,ExceptionInfo *exception)
568</pre>
569
570<p>A description of each parameter follows:</p>
571
572<h5>image</h5>
573<p>the image.</p>
574
575<h5>channel</h5>
576<p>the channel type.</p>
577
578<h5>angle</h5>
579<p>the angle of the radial blur.</p>
580
581<h5>exception</h5>
582<p>return any errors or warnings in this structure.</p>
583
584 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]585<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]586<div class="doc-section">
587
588<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>
589
590<p>The format of the ReduceNoiseImage method is:</p>
591
592<pre class="code">
593 Image *ReduceNoiseImage(const Image *image,const double radius,
594 ExceptionInfo *exception)
595</pre>
596
597<p>A description of each parameter follows:</p>
598
599<h5>image</h5>
600<p>the image.</p>
601
602<h5>radius</h5>
603<p>the radius of the pixel neighborhood.</p>
604
605<h5>exception</h5>
606<p>return any errors or warnings in this structure.</p>
607
608 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]609<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]610<div class="doc-section">
611
612<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>
613
614<p>The format of the SelectiveBlurImage method is:</p>
615
616<pre class="code">
617 Image *SelectiveBlurImage(const Image *image,const double radius,
618 const double sigma,const double threshold,ExceptionInfo *exception)
619 Image *SelectiveBlurImageChannel(const Image *image,
620 const ChannelType channel,const double radius,const double sigma,
621 const double threshold,ExceptionInfo *exception)
622</pre>
623
624<p>A description of each parameter follows:</p>
625
626<h5>image</h5>
627<p>the image.</p>
628
629<h5>channel</h5>
630<p>the channel type.</p>
631
632<h5>radius</h5>
633<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
634
635<h5>sigma</h5>
636<p>the standard deviation of the Gaussian, in pixels.</p>
637
638<h5>threshold</h5>
639<p>only pixels within this contrast threshold are included in the blur operation.</p>
640
641<h5>exception</h5>
642<p>return any errors or warnings in this structure.</p>
643
644 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]645<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]646<div class="doc-section">
647
648<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>
649
650<p>The format of the ShadeImage method is:</p>
651
652<pre class="code">
653 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
654 const double azimuth,const double elevation,ExceptionInfo *exception)
655</pre>
656
657<p>A description of each parameter follows:</p>
658
659<h5>image</h5>
660<p>the image.</p>
661
662<h5>gray</h5>
663<p>A value other than zero shades the intensity of each pixel.</p>
664
665<h5>azimuth, elevation</h5>
666<p>Define the light source direction.</p>
667
668<h5>exception</h5>
669<p>return any errors or warnings in this structure.</p>
670
671 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]672<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]673<div class="doc-section">
674
675<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>
676
677<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>
678
679<p>The format of the SharpenImage method is:</p>
680
681<pre class="code">
682 Image *SharpenImage(const Image *image,const double radius,
683 const double sigma,ExceptionInfo *exception)
684 Image *SharpenImageChannel(const Image *image,const ChannelType channel,
685 const double radius,const double sigma,ExceptionInfo *exception)
686</pre>
687
688<p>A description of each parameter follows:</p>
689
690<h5>image</h5>
691<p>the image.</p>
692
693<h5>channel</h5>
694<p>the channel type.</p>
695
696<h5>radius</h5>
697<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
698
699<h5>sigma</h5>
700<p>the standard deviation of the Laplacian, in pixels.</p>
701
702<h5>exception</h5>
703<p>return any errors or warnings in this structure.</p>
704
705 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]706<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]707<div class="doc-section">
708
709<p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p>
710
711<p>The format of the SpreadImage method is:</p>
712
713<pre class="code">
714 Image *SpreadImage(const Image *image,const double radius,
715 ExceptionInfo *exception)
716</pre>
717
718<p>A description of each parameter follows:</p>
719
720<h5>image</h5>
721<p>the image.</p>
722
723<h5>radius</h5>
724<p>Choose a random pixel in a neighborhood of this extent.</p>
725
726<h5>exception</h5>
727<p>return any errors or warnings in this structure.</p>
728
729 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]730<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]731<div class="doc-section">
732
733<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>
734
735<p>The format of the UnsharpMaskImage method is:</p>
736
737<pre class="code">
738 Image *UnsharpMaskImage(const Image *image,const double radius,
739 const double sigma,const double amount,const double threshold,
740 ExceptionInfo *exception)
741 Image *UnsharpMaskImageChannel(const Image *image,
742 const ChannelType channel,const double radius,const double sigma,
743 const double amount,const double threshold,ExceptionInfo *exception)
744</pre>
745
746<p>A description of each parameter follows:</p>
747
748<h5>image</h5>
749<p>the image.</p>
750
751<h5>channel</h5>
752<p>the channel type.</p>
753
754<h5>radius</h5>
755<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
756
757<h5>sigma</h5>
758<p>the standard deviation of the Gaussian, in pixels.</p>
759
760<h5>amount</h5>
761<p>the percentage of the difference between the original and the blur image that is added back into the original.</p>
762
763<h5>threshold</h5>
764<p>the threshold in pixels needed to apply the diffence amount.</p>
765
766<h5>exception</h5>
767<p>return any errors or warnings in this structure.</p>
768
769 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]770
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