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199 <h1>Module effect Methods</h1>
200 <p class="navigation-index">[<a href="#AdaptiveBlurImage">AdaptiveBlurImage</a> • <a href="#AdaptiveSharpenImage">AdaptiveSharpenImage</a> • <a href="#BlurImage">BlurImage</a> • <a href="#ConvolveImage">ConvolveImage</a> • <a href="#DespeckleImage">DespeckleImage</a> • <a href="#EdgeImage">EdgeImage</a> • <a href="#EmbossImage">EmbossImage</a> • <a href="#FilterImage">FilterImage</a> • <a href="#GaussianBlurImage">GaussianBlurImage</a> • <a href="#MedianFilterImage">MedianFilterImage</a> • <a href="#ModeImage">ModeImage</a> • <a href="#MotionBlurImage">MotionBlurImage</a> • <a href="#PreviewImage">PreviewImage</a> • <a href="#RadialBlurImage">RadialBlurImage</a> • <a href="#ReduceNoiseImage">ReduceNoiseImage</a> • <a href="#SelectiveBlurImage">SelectiveBlurImage</a> • <a href="#ShadeImage">ShadeImage</a> • <a href="#SharpenImage">SharpenImage</a> • <a href="#SpreadImage">SpreadImage</a> • <a href="#UnsharpMaskImage">UnsharpMaskImage</a>]</p>
202 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveBlurImage">AdaptiveBlurImage</a></h2>
203 <div class="doc-section">
205 <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>
207 <p>The format of the AdaptiveBlurImage method is:</p>
210 Image *AdaptiveBlurImage(const Image *image,const double radius,
211 const double sigma,ExceptionInfo *exception)
212 Image *AdaptiveBlurImageChannel(const Image *image,
213 const ChannelType channel,double radius,const double sigma,
214 ExceptionInfo *exception)
217 <p>A description of each parameter follows:</p>
223 <p>the channel type.</p>
226 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
229 <p>the standard deviation of the Laplacian, in pixels.</p>
232 <p>return any errors or warnings in this structure.</p>
235 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveSharpenImage">AdaptiveSharpenImage</a></h2>
236 <div class="doc-section">
238 <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>
240 <p>The format of the AdaptiveSharpenImage method is:</p>
243 Image *AdaptiveSharpenImage(const Image *image,const double radius,
244 const double sigma,ExceptionInfo *exception)
245 Image *AdaptiveSharpenImageChannel(const Image *image,
246 const ChannelType channel,double radius,const double sigma,
247 ExceptionInfo *exception)
250 <p>A description of each parameter follows:</p>
256 <p>the channel type.</p>
259 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
262 <p>the standard deviation of the Laplacian, in pixels.</p>
265 <p>return any errors or warnings in this structure.</p>
268 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="BlurImage">BlurImage</a></h2>
269 <div class="doc-section">
271 <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>
273 <p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p>
275 <p>The format of the BlurImage method is:</p>
278 Image *BlurImage(const Image *image,const double radius,
279 const double sigma,ExceptionInfo *exception)
280 Image *BlurImageChannel(const Image *image,const ChannelType channel,
281 const double radius,const double sigma,ExceptionInfo *exception)
284 <p>A description of each parameter follows:</p>
290 <p>the channel type.</p>
293 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
296 <p>the standard deviation of the Gaussian, in pixels.</p>
299 <p>return any errors or warnings in this structure.</p>
302 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ConvolveImage">ConvolveImage</a></h2>
303 <div class="doc-section">
305 <p>ConvolveImage() applies a custom convolution kernel to the image.</p>
307 <p>The format of the ConvolveImage method is:</p>
310 Image *ConvolveImage(const Image *image,const size_t order,
311 const double *kernel,ExceptionInfo *exception)
312 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
313 const size_t order,const double *kernel,ExceptionInfo *exception)
316 <p>A description of each parameter follows:</p>
322 <p>the channel type.</p>
325 <p>the number of columns and rows in the filter kernel.</p>
328 <p>An array of double representing the convolution kernel.</p>
331 <p>return any errors or warnings in this structure.</p>
334 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="DespeckleImage">DespeckleImage</a></h2>
335 <div class="doc-section">
337 <p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p>
339 <p>The format of the DespeckleImage method is:</p>
342 Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
345 <p>A description of each parameter follows:</p>
351 <p>return any errors or warnings in this structure.</p>
354 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EdgeImage">EdgeImage</a></h2>
355 <div class="doc-section">
357 <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>
359 <p>The format of the EdgeImage method is:</p>
362 Image *EdgeImage(const Image *image,const double radius,
363 ExceptionInfo *exception)
366 <p>A description of each parameter follows:</p>
372 <p>the radius of the pixel neighborhood.</p>
375 <p>return any errors or warnings in this structure.</p>
378 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EmbossImage">EmbossImage</a></h2>
379 <div class="doc-section">
381 <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>
383 <p>The format of the EmbossImage method is:</p>
386 Image *EmbossImage(const Image *image,const double radius,
387 const double sigma,ExceptionInfo *exception)
390 <p>A description of each parameter follows:</p>
396 <p>the radius of the pixel neighborhood.</p>
399 <p>the standard deviation of the Gaussian, in pixels.</p>
402 <p>return any errors or warnings in this structure.</p>
405 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="FilterImage">FilterImage</a></h2>
406 <div class="doc-section">
408 <p>FilterImage() applies a custom convolution kernel to the image.</p>
410 <p>The format of the FilterImage method is:</p>
413 Image *FilterImage(const Image *image,const KernelInfo *kernel,
414 ExceptionInfo *exception)
415 Image *FilterImageChannel(const Image *image,const ChannelType channel,
416 const KernelInfo *kernel,ExceptionInfo *exception)
419 <p>A description of each parameter follows:</p>
425 <p>the channel type.</p>
428 <p>the filtering kernel.</p>
431 <p>return any errors or warnings in this structure.</p>
434 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="GaussianBlurImage">GaussianBlurImage</a></h2>
435 <div class="doc-section">
437 <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>
439 <p>The format of the GaussianBlurImage method is:</p>
442 Image *GaussianBlurImage(const Image *image,onst double radius,
443 const double sigma,ExceptionInfo *exception)
444 Image *GaussianBlurImageChannel(const Image *image,
445 const ChannelType channel,const double radius,const double sigma,
446 ExceptionInfo *exception)
449 <p>A description of each parameter follows:</p>
455 <p>the channel type.</p>
458 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
461 <p>the standard deviation of the Gaussian, in pixels.</p>
464 <p>return any errors or warnings in this structure.</p>
467 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="MedianFilterImage">MedianFilterImage</a></h2>
468 <div class="doc-section">
470 <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>
472 <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>
474 <p>The format of the MedianFilterImage method is:</p>
477 Image *MedianFilterImage(const Image *image,const double radius,
478 ExceptionInfo *exception)
481 <p>A description of each parameter follows:</p>
487 <p>the radius of the pixel neighborhood.</p>
490 <p>return any errors or warnings in this structure.</p>
493 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ModeImage">ModeImage</a></h2>
494 <div class="doc-section">
496 <p>ModeImage() makes each pixel the 'predominate color' of the neighborhood of the specified radius.</p>
498 <p>The format of the ModeImage method is:</p>
501 Image *ModeImage(const Image *image,const double radius,
502 ExceptionInfo *exception)
505 <p>A description of each parameter follows:</p>
511 <p>the radius of the pixel neighborhood.</p>
514 <p>return any errors or warnings in this structure.</p>
517 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="MotionBlurImage">MotionBlurImage</a></h2>
518 <div class="doc-section">
520 <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>
522 <p>Andrew Protano contributed this effect.</p>
524 <p>The format of the MotionBlurImage method is:</p>
527 Image *MotionBlurImage(const Image *image,const double radius,
528 const double sigma,const double angle,ExceptionInfo *exception)
529 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
530 const double radius,const double sigma,const double angle,
531 ExceptionInfo *exception)
534 <p>A description of each parameter follows:</p>
540 <p>the channel type.</p>
543 <p>the radius of the Gaussian, in pixels, not counting the center</p>
545 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
548 <p>the standard deviation of the Gaussian, in pixels.</p>
551 <p>Apply the effect along this angle.</p>
554 <p>return any errors or warnings in this structure.</p>
557 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="PreviewImage">PreviewImage</a></h2>
558 <div class="doc-section">
560 <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>
562 <p>The format of the PreviewImages method is:</p>
565 Image *PreviewImages(const Image *image,const PreviewType preview,
566 ExceptionInfo *exception)
569 <p>A description of each parameter follows:</p>
575 <p>the image processing operation.</p>
578 <p>return any errors or warnings in this structure.</p>
581 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="RadialBlurImage">RadialBlurImage</a></h2>
582 <div class="doc-section">
584 <p>RadialBlurImage() applies a radial blur to the image.</p>
586 <p>Andrew Protano contributed this effect.</p>
588 <p>The format of the RadialBlurImage method is:</p>
591 Image *RadialBlurImage(const Image *image,const double angle,
592 ExceptionInfo *exception)
593 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
594 const double angle,ExceptionInfo *exception)
597 <p>A description of each parameter follows:</p>
603 <p>the channel type.</p>
606 <p>the angle of the radial blur.</p>
609 <p>return any errors or warnings in this structure.</p>
612 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ReduceNoiseImage">ReduceNoiseImage</a></h2>
613 <div class="doc-section">
615 <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>
617 <p>The format of the ReduceNoiseImage method is:</p>
620 Image *ReduceNoiseImage(const Image *image,const double radius,
621 ExceptionInfo *exception)
624 <p>A description of each parameter follows:</p>
630 <p>the radius of the pixel neighborhood.</p>
633 <p>return any errors or warnings in this structure.</p>
636 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SelectiveBlurImage">SelectiveBlurImage</a></h2>
637 <div class="doc-section">
639 <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>
641 <p>The format of the SelectiveBlurImage method is:</p>
644 Image *SelectiveBlurImage(const Image *image,const double radius,
645 const double sigma,const double threshold,ExceptionInfo *exception)
646 Image *SelectiveBlurImageChannel(const Image *image,
647 const ChannelType channel,const double radius,const double sigma,
648 const double threshold,ExceptionInfo *exception)
651 <p>A description of each parameter follows:</p>
657 <p>the channel type.</p>
660 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
663 <p>the standard deviation of the Gaussian, in pixels.</p>
666 <p>only pixels within this contrast threshold are included in the blur operation.</p>
669 <p>return any errors or warnings in this structure.</p>
672 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ShadeImage">ShadeImage</a></h2>
673 <div class="doc-section">
675 <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>
677 <p>The format of the ShadeImage method is:</p>
680 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
681 const double azimuth,const double elevation,ExceptionInfo *exception)
684 <p>A description of each parameter follows:</p>
690 <p>A value other than zero shades the intensity of each pixel.</p>
692 <h5>azimuth, elevation</h5>
693 <p>Define the light source direction.</p>
696 <p>return any errors or warnings in this structure.</p>
699 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SharpenImage">SharpenImage</a></h2>
700 <div class="doc-section">
702 <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>
704 <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>
706 <p>The format of the SharpenImage method is:</p>
709 Image *SharpenImage(const Image *image,const double radius,
710 const double sigma,ExceptionInfo *exception)
711 Image *SharpenImageChannel(const Image *image,const ChannelType channel,
712 const double radius,const double sigma,ExceptionInfo *exception)
715 <p>A description of each parameter follows:</p>
721 <p>the channel type.</p>
724 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
727 <p>the standard deviation of the Laplacian, in pixels.</p>
730 <p>return any errors or warnings in this structure.</p>
733 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SpreadImage">SpreadImage</a></h2>
734 <div class="doc-section">
736 <p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p>
738 <p>The format of the SpreadImage method is:</p>
741 Image *SpreadImage(const Image *image,const double radius,
742 ExceptionInfo *exception)
745 <p>A description of each parameter follows:</p>
751 <p>Choose a random pixel in a neighborhood of this extent.</p>
754 <p>return any errors or warnings in this structure.</p>
757 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="UnsharpMaskImage">UnsharpMaskImage</a></h2>
758 <div class="doc-section">
760 <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>
762 <p>The format of the UnsharpMaskImage method is:</p>
765 Image *UnsharpMaskImage(const Image *image,const double radius,
766 const double sigma,const double amount,const double threshold,
767 ExceptionInfo *exception)
768 Image *UnsharpMaskImageChannel(const Image *image,
769 const ChannelType channel,const double radius,const double sigma,
770 const double amount,const double threshold,ExceptionInfo *exception)
773 <p>A description of each parameter follows:</p>
779 <p>the channel type.</p>
782 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
785 <p>the standard deviation of the Gaussian, in pixels.</p>
788 <p>the percentage of the difference between the original and the blur image that is added back into the original.</p>
791 <p>the threshold in pixels needed to apply the diffence amount.</p>
794 <p>return any errors or warnings in this structure.</p>
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