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213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h1>Module effect Methods</h1>
cristyb52981c2011-03-19 17:09:31 +0000[diff] [blame]215<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="#MotionBlurImage">MotionBlurImage</a> &bull; <a href="#PreviewImage">PreviewImage</a> &bull; <a href="#RadialBlurImage">RadialBlurImage</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="#StatisticImage">StatisticImage</a> &bull; <a href="#UnsharpMaskImage">UnsharpMaskImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]216
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]217<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]218<div class="doc-section">
219
220<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>
221
222<p>The format of the AdaptiveBlurImage method is:</p>
223
224<pre class="code">
225 Image *AdaptiveBlurImage(const Image *image,const double radius,
226 const double sigma,ExceptionInfo *exception)
227 Image *AdaptiveBlurImageChannel(const Image *image,
228 const ChannelType channel,double radius,const double sigma,
229 ExceptionInfo *exception)
230</pre>
231
232<p>A description of each parameter follows:</p>
233
234<h5>image</h5>
235<p>the image.</p>
236
237<h5>channel</h5>
238<p>the channel type.</p>
239
240<h5>radius</h5>
241<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
242
243<h5>sigma</h5>
244<p>the standard deviation of the Laplacian, in pixels.</p>
245
246<h5>exception</h5>
247<p>return any errors or warnings in this structure.</p>
248
249 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]250<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]251<div class="doc-section">
252
253<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>
254
255<p>The format of the AdaptiveSharpenImage method is:</p>
256
257<pre class="code">
258 Image *AdaptiveSharpenImage(const Image *image,const double radius,
259 const double sigma,ExceptionInfo *exception)
260 Image *AdaptiveSharpenImageChannel(const Image *image,
261 const ChannelType channel,double radius,const double sigma,
262 ExceptionInfo *exception)
263</pre>
264
265<p>A description of each parameter follows:</p>
266
267<h5>image</h5>
268<p>the image.</p>
269
270<h5>channel</h5>
271<p>the channel type.</p>
272
273<h5>radius</h5>
274<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
275
276<h5>sigma</h5>
277<p>the standard deviation of the Laplacian, in pixels.</p>
278
279<h5>exception</h5>
280<p>return any errors or warnings in this structure.</p>
281
282 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]283<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]284<div class="doc-section">
285
286<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>
287
288<p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p>
289
290<p>The format of the BlurImage method is:</p>
291
292<pre class="code">
293 Image *BlurImage(const Image *image,const double radius,
294 const double sigma,ExceptionInfo *exception)
295 Image *BlurImageChannel(const Image *image,const ChannelType channel,
296 const double radius,const double sigma,ExceptionInfo *exception)
297</pre>
298
299<p>A description of each parameter follows:</p>
300
301<h5>image</h5>
302<p>the image.</p>
303
304<h5>channel</h5>
305<p>the channel type.</p>
306
307<h5>radius</h5>
308<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
309
310<h5>sigma</h5>
311<p>the standard deviation of the Gaussian, in pixels.</p>
312
313<h5>exception</h5>
314<p>return any errors or warnings in this structure.</p>
315
316 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]317<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]318<div class="doc-section">
319
320<p>ConvolveImage() applies a custom convolution kernel to the image.</p>
321
322<p>The format of the ConvolveImage method is:</p>
323
324<pre class="code">
325 Image *ConvolveImage(const Image *image,const size_t order,
326 const double *kernel,ExceptionInfo *exception)
327 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
328 const size_t order,const double *kernel,ExceptionInfo *exception)
329</pre>
330
331<p>A description of each parameter follows:</p>
332
333<h5>image</h5>
334<p>the image.</p>
335
336<h5>channel</h5>
337<p>the channel type.</p>
338
339<h5>order</h5>
340<p>the number of columns and rows in the filter kernel.</p>
341
342<h5>kernel</h5>
343<p>An array of double representing the convolution kernel.</p>
344
345<h5>exception</h5>
346<p>return any errors or warnings in this structure.</p>
347
348 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]349<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]350<div class="doc-section">
351
352<p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p>
353
354<p>The format of the DespeckleImage method is:</p>
355
356<pre class="code">
357 Image *DespeckleImage(const Image *image,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>exception</h5>
366<p>return any errors or warnings in this structure.</p>
367
368 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]369<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]370<div class="doc-section">
371
372<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>
373
374<p>The format of the EdgeImage method is:</p>
375
376<pre class="code">
377 Image *EdgeImage(const Image *image,const double radius,
378 ExceptionInfo *exception)
379</pre>
380
381<p>A description of each parameter follows:</p>
382
383<h5>image</h5>
384<p>the image.</p>
385
386<h5>radius</h5>
387<p>the radius of the pixel neighborhood.</p>
388
389<h5>exception</h5>
390<p>return any errors or warnings in this structure.</p>
391
392 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]393<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]394<div class="doc-section">
395
396<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>
397
398<p>The format of the EmbossImage method is:</p>
399
400<pre class="code">
401 Image *EmbossImage(const Image *image,const double radius,
402 const double sigma,ExceptionInfo *exception)
403</pre>
404
405<p>A description of each parameter follows:</p>
406
407<h5>image</h5>
408<p>the image.</p>
409
410<h5>radius</h5>
411<p>the radius of the pixel neighborhood.</p>
412
413<h5>sigma</h5>
414<p>the standard deviation of the Gaussian, in pixels.</p>
415
416<h5>exception</h5>
417<p>return any errors or warnings in this structure.</p>
418
419 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]420<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]421<div class="doc-section">
422
423<p>FilterImage() applies a custom convolution kernel to the image.</p>
424
425<p>The format of the FilterImage method is:</p>
426
427<pre class="code">
428 Image *FilterImage(const Image *image,const KernelInfo *kernel,
429 ExceptionInfo *exception)
430 Image *FilterImageChannel(const Image *image,const ChannelType channel,
431 const KernelInfo *kernel,ExceptionInfo *exception)
432</pre>
433
434<p>A description of each parameter follows:</p>
435
436<h5>image</h5>
437<p>the image.</p>
438
439<h5>channel</h5>
440<p>the channel type.</p>
441
442<h5>kernel</h5>
443<p>the filtering kernel.</p>
444
445<h5>exception</h5>
446<p>return any errors or warnings in this structure.</p>
447
448 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]449<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]450<div class="doc-section">
451
452<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>
453
454<p>The format of the GaussianBlurImage method is:</p>
455
456<pre class="code">
457 Image *GaussianBlurImage(const Image *image,onst double radius,
458 const double sigma,ExceptionInfo *exception)
459 Image *GaussianBlurImageChannel(const Image *image,
460 const ChannelType channel,const double radius,const double sigma,
461 ExceptionInfo *exception)
462</pre>
463
464<p>A description of each parameter follows:</p>
465
466<h5>image</h5>
467<p>the image.</p>
468
469<h5>channel</h5>
470<p>the channel type.</p>
471
472<h5>radius</h5>
473<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
474
475<h5>sigma</h5>
476<p>the standard deviation of the Gaussian, in pixels.</p>
477
478<h5>exception</h5>
479<p>return any errors or warnings in this structure.</p>
480
481 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]482<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]483<div class="doc-section">
484
485<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>
486
487<p>Andrew Protano contributed this effect.</p>
488
489<p>The format of the MotionBlurImage method is:</p>
490
491<pre class="code">
492 Image *MotionBlurImage(const Image *image,const double radius,
493 const double sigma,const double angle,ExceptionInfo *exception)
494 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
495 const double radius,const double sigma,const double angle,
496 ExceptionInfo *exception)
497</pre>
498
499<p>A description of each parameter follows:</p>
500
501<h5>image</h5>
502<p>the image.</p>
503
504<h5>channel</h5>
505<p>the channel type.</p>
506
507<h5>radius</h5>
508<p>the radius of the Gaussian, in pixels, not counting the center</p>
509<h5>radius</h5>
510<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
511
512<h5>sigma</h5>
513<p>the standard deviation of the Gaussian, in pixels.</p>
514
515<h5>angle</h5>
516<p>Apply the effect along this angle.</p>
517
518<h5>exception</h5>
519<p>return any errors or warnings in this structure.</p>
520
521 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]522<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]523<div class="doc-section">
524
525<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>
526
527<p>The format of the PreviewImages method is:</p>
528
529<pre class="code">
530 Image *PreviewImages(const Image *image,const PreviewType preview,
531 ExceptionInfo *exception)
532</pre>
533
534<p>A description of each parameter follows:</p>
535
536<h5>image</h5>
537<p>the image.</p>
538
539<h5>preview</h5>
540<p>the image processing operation.</p>
541
542<h5>exception</h5>
543<p>return any errors or warnings in this structure.</p>
544
545 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]546<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]547<div class="doc-section">
548
549<p>RadialBlurImage() applies a radial blur to the image.</p>
550
551<p>Andrew Protano contributed this effect.</p>
552
553<p>The format of the RadialBlurImage method is:</p>
554
555<pre class="code">
556 Image *RadialBlurImage(const Image *image,const double angle,
557 ExceptionInfo *exception)
558 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
559 const double angle,ExceptionInfo *exception)
560</pre>
561
562<p>A description of each parameter follows:</p>
563
564<h5>image</h5>
565<p>the image.</p>
566
567<h5>channel</h5>
568<p>the channel type.</p>
569
570<h5>angle</h5>
571<p>the angle of the radial blur.</p>
572
573<h5>exception</h5>
574<p>return any errors or warnings in this structure.</p>
575
576 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]577<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]578<div class="doc-section">
579
580<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>
581
582<p>The format of the SelectiveBlurImage method is:</p>
583
584<pre class="code">
585 Image *SelectiveBlurImage(const Image *image,const double radius,
586 const double sigma,const double threshold,ExceptionInfo *exception)
587 Image *SelectiveBlurImageChannel(const Image *image,
588 const ChannelType channel,const double radius,const double sigma,
589 const double threshold,ExceptionInfo *exception)
590</pre>
591
592<p>A description of each parameter follows:</p>
593
594<h5>image</h5>
595<p>the image.</p>
596
597<h5>channel</h5>
598<p>the channel type.</p>
599
600<h5>radius</h5>
601<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
602
603<h5>sigma</h5>
604<p>the standard deviation of the Gaussian, in pixels.</p>
605
606<h5>threshold</h5>
607<p>only pixels within this contrast threshold are included in the blur operation.</p>
608
609<h5>exception</h5>
610<p>return any errors or warnings in this structure.</p>
611
612 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]613<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]614<div class="doc-section">
615
616<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>
617
618<p>The format of the ShadeImage method is:</p>
619
620<pre class="code">
621 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
622 const double azimuth,const double elevation,ExceptionInfo *exception)
623</pre>
624
625<p>A description of each parameter follows:</p>
626
627<h5>image</h5>
628<p>the image.</p>
629
630<h5>gray</h5>
631<p>A value other than zero shades the intensity of each pixel.</p>
632
633<h5>azimuth, elevation</h5>
634<p>Define the light source direction.</p>
635
636<h5>exception</h5>
637<p>return any errors or warnings in this structure.</p>
638
639 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]640<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]641<div class="doc-section">
642
643<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>
644
645<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>
646
647<p>The format of the SharpenImage method is:</p>
648
649<pre class="code">
650 Image *SharpenImage(const Image *image,const double radius,
651 const double sigma,ExceptionInfo *exception)
652 Image *SharpenImageChannel(const Image *image,const ChannelType channel,
653 const double radius,const double sigma,ExceptionInfo *exception)
654</pre>
655
656<p>A description of each parameter follows:</p>
657
658<h5>image</h5>
659<p>the image.</p>
660
661<h5>channel</h5>
662<p>the channel type.</p>
663
664<h5>radius</h5>
665<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
666
667<h5>sigma</h5>
668<p>the standard deviation of the Laplacian, in pixels.</p>
669
670<h5>exception</h5>
671<p>return any errors or warnings in this structure.</p>
672
673 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]674<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]675<div class="doc-section">
676
677<p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p>
678
679<p>The format of the SpreadImage method is:</p>
680
681<pre class="code">
682 Image *SpreadImage(const Image *image,const double radius,
683 ExceptionInfo *exception)
684</pre>
685
686<p>A description of each parameter follows:</p>
687
688<h5>image</h5>
689<p>the image.</p>
690
691<h5>radius</h5>
692<p>Choose a random pixel in a neighborhood of this extent.</p>
693
694<h5>exception</h5>
695<p>return any errors or warnings in this structure.</p>
696
697 </div>
cristyb52981c2011-03-19 17:09:31 +0000[diff] [blame]698<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="StatisticImage">StatisticImage</a></h2>
699<div class="doc-section">
700
701<p>StatisticImage() makes each pixel the min / max / median / mode / etc. of the neighborhood of the specified width and height.</p>
702
703<p>The format of the StatisticImage method is:</p>
704
705<pre class="code">
706 Image *StatisticImage(const Image *image,const StatisticType type,
707 const size_t width,const size_t height,ExceptionInfo *exception)
708 Image *StatisticImageChannel(const Image *image,
709 const ChannelType channel,const StatisticType type,
710 const size_t width,const size_t height,ExceptionInfo *exception)
711</pre>
712
713<p>A description of each parameter follows:</p>
714
715<h5>image</h5>
716<p>the image.</p>
717
718<h5>channel</h5>
719<p>the image channel.</p>
720
721<h5>type</h5>
722<p>the statistic type (median, mode, etc.).</p>
723
724<h5>width</h5>
725<p>the width of the pixel neighborhood.</p>
726
727<h5>height</h5>
728<p>the height of the pixel neighborhood.</p>
729
730<h5>exception</h5>
731<p>return any errors or warnings in this structure.</p>
732
733 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]734<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]735<div class="doc-section">
736
737<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>
738
739<p>The format of the UnsharpMaskImage method is:</p>
740
741<pre class="code">
742 Image *UnsharpMaskImage(const Image *image,const double radius,
743 const double sigma,const double amount,const double threshold,
744 ExceptionInfo *exception)
745 Image *UnsharpMaskImageChannel(const Image *image,
746 const ChannelType channel,const double radius,const double sigma,
747 const double amount,const double threshold,ExceptionInfo *exception)
748</pre>
749
750<p>A description of each parameter follows:</p>
751
752<h5>image</h5>
753<p>the image.</p>
754
755<h5>channel</h5>
756<p>the channel type.</p>
757
758<h5>radius</h5>
759<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
760
761<h5>sigma</h5>
762<p>the standard deviation of the Gaussian, in pixels.</p>
763
764<h5>amount</h5>
765<p>the percentage of the difference between the original and the blur image that is added back into the original.</p>
766
767<h5>threshold</h5>
768<p>the threshold in pixels needed to apply the diffence amount.</p>
769
770<h5>exception</h5>
771<p>return any errors or warnings in this structure.</p>
772
773 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]774
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