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218 <h1>Module effect Methods</h1>
219 <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="#MotionBlurImage">MotionBlurImage</a> • <a href="#PreviewImage">PreviewImage</a> • <a href="#RadialBlurImage">RadialBlurImage</a> • <a href="#SelectiveBlurImage">SelectiveBlurImage</a> • <a href="#ShadeImage">ShadeImage</a> • <a href="#SharpenImage">SharpenImage</a> • <a href="#SpreadImage">SpreadImage</a> • <a href="#StatisticImage">StatisticImage</a> • <a href="#UnsharpMaskImage">UnsharpMaskImage</a>]</p>
221 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveBlurImage">AdaptiveBlurImage</a></h2>
222 <div class="doc-section">
224 <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>
226 <p>The format of the AdaptiveBlurImage method is:</p>
229 Image *AdaptiveBlurImage(const Image *image,const double radius,
230 const double sigma,ExceptionInfo *exception)
231 Image *AdaptiveBlurImageChannel(const Image *image,
232 const ChannelType channel,double radius,const double sigma,
233 ExceptionInfo *exception)
236 <p>A description of each parameter follows:</p>
242 <p>the channel type.</p>
245 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
248 <p>the standard deviation of the Laplacian, in pixels.</p>
251 <p>return any errors or warnings in this structure.</p>
254 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveSharpenImage">AdaptiveSharpenImage</a></h2>
255 <div class="doc-section">
257 <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>
259 <p>The format of the AdaptiveSharpenImage method is:</p>
262 Image *AdaptiveSharpenImage(const Image *image,const double radius,
263 const double sigma,ExceptionInfo *exception)
264 Image *AdaptiveSharpenImageChannel(const Image *image,
265 const ChannelType channel,double radius,const double sigma,
266 ExceptionInfo *exception)
269 <p>A description of each parameter follows:</p>
275 <p>the channel type.</p>
278 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
281 <p>the standard deviation of the Laplacian, in pixels.</p>
284 <p>return any errors or warnings in this structure.</p>
287 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="BlurImage">BlurImage</a></h2>
288 <div class="doc-section">
290 <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>
292 <p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p>
294 <p>The format of the BlurImage method is:</p>
297 Image *BlurImage(const Image *image,const double radius,
298 const double sigma,ExceptionInfo *exception)
299 Image *BlurImageChannel(const Image *image,const ChannelType channel,
300 const double radius,const double sigma,ExceptionInfo *exception)
303 <p>A description of each parameter follows:</p>
309 <p>the channel type.</p>
312 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
315 <p>the standard deviation of the Gaussian, in pixels.</p>
318 <p>return any errors or warnings in this structure.</p>
321 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ConvolveImage">ConvolveImage</a></h2>
322 <div class="doc-section">
324 <p>ConvolveImage() applies a custom convolution kernel to the image.</p>
326 <p>The format of the ConvolveImage method is:</p>
329 Image *ConvolveImage(const Image *image,const size_t order,
330 const double *kernel,ExceptionInfo *exception)
331 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
332 const size_t order,const double *kernel,ExceptionInfo *exception)
335 <p>A description of each parameter follows:</p>
341 <p>the channel type.</p>
344 <p>the number of columns and rows in the filter kernel.</p>
347 <p>An array of double representing the convolution kernel.</p>
350 <p>return any errors or warnings in this structure.</p>
353 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="DespeckleImage">DespeckleImage</a></h2>
354 <div class="doc-section">
356 <p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p>
358 <p>The format of the DespeckleImage method is:</p>
361 Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
364 <p>A description of each parameter follows:</p>
370 <p>return any errors or warnings in this structure.</p>
373 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EdgeImage">EdgeImage</a></h2>
374 <div class="doc-section">
376 <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>
378 <p>The format of the EdgeImage method is:</p>
381 Image *EdgeImage(const Image *image,const double radius,
382 ExceptionInfo *exception)
385 <p>A description of each parameter follows:</p>
391 <p>the radius of the pixel neighborhood.</p>
394 <p>return any errors or warnings in this structure.</p>
397 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EmbossImage">EmbossImage</a></h2>
398 <div class="doc-section">
400 <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>
402 <p>The format of the EmbossImage method is:</p>
405 Image *EmbossImage(const Image *image,const double radius,
406 const double sigma,ExceptionInfo *exception)
409 <p>A description of each parameter follows:</p>
415 <p>the radius of the pixel neighborhood.</p>
418 <p>the standard deviation of the Gaussian, in pixels.</p>
421 <p>return any errors or warnings in this structure.</p>
424 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="FilterImage">FilterImage</a></h2>
425 <div class="doc-section">
427 <p>FilterImage() applies a custom convolution kernel to the image.</p>
429 <p>The format of the FilterImage method is:</p>
432 Image *FilterImage(const Image *image,const KernelInfo *kernel,
433 ExceptionInfo *exception)
434 Image *FilterImageChannel(const Image *image,const ChannelType channel,
435 const KernelInfo *kernel,ExceptionInfo *exception)
438 <p>A description of each parameter follows:</p>
444 <p>the channel type.</p>
447 <p>the filtering kernel.</p>
450 <p>return any errors or warnings in this structure.</p>
453 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="GaussianBlurImage">GaussianBlurImage</a></h2>
454 <div class="doc-section">
456 <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>
458 <p>The format of the GaussianBlurImage method is:</p>
461 Image *GaussianBlurImage(const Image *image,onst double radius,
462 const double sigma,ExceptionInfo *exception)
463 Image *GaussianBlurImageChannel(const Image *image,
464 const ChannelType channel,const double radius,const double sigma,
465 ExceptionInfo *exception)
468 <p>A description of each parameter follows:</p>
474 <p>the channel type.</p>
477 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
480 <p>the standard deviation of the Gaussian, in pixels.</p>
483 <p>return any errors or warnings in this structure.</p>
486 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="MotionBlurImage">MotionBlurImage</a></h2>
487 <div class="doc-section">
489 <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 <p>Andrew Protano contributed this effect.</p>
493 <p>The format of the MotionBlurImage method is:</p>
496 Image *MotionBlurImage(const Image *image,const double radius,
497 const double sigma,const double angle,ExceptionInfo *exception)
498 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
499 const double radius,const double sigma,const double angle,
500 ExceptionInfo *exception)
503 <p>A description of each parameter follows:</p>
509 <p>the channel type.</p>
512 <p>the radius of the Gaussian, in pixels, not counting the center</p>
514 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
517 <p>the standard deviation of the Gaussian, in pixels.</p>
520 <p>Apply the effect along this angle.</p>
523 <p>return any errors or warnings in this structure.</p>
526 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="PreviewImage">PreviewImage</a></h2>
527 <div class="doc-section">
529 <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 <p>The format of the PreviewImages method is:</p>
534 Image *PreviewImages(const Image *image,const PreviewType preview,
535 ExceptionInfo *exception)
538 <p>A description of each parameter follows:</p>
544 <p>the image processing operation.</p>
547 <p>return any errors or warnings in this structure.</p>
550 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="RadialBlurImage">RadialBlurImage</a></h2>
551 <div class="doc-section">
553 <p>RadialBlurImage() applies a radial blur to the image.</p>
555 <p>Andrew Protano contributed this effect.</p>
557 <p>The format of the RadialBlurImage method is:</p>
560 Image *RadialBlurImage(const Image *image,const double angle,
561 ExceptionInfo *exception)
562 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
563 const double angle,ExceptionInfo *exception)
566 <p>A description of each parameter follows:</p>
572 <p>the channel type.</p>
575 <p>the angle of the radial blur.</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="SelectiveBlurImage">SelectiveBlurImage</a></h2>
582 <div class="doc-section">
584 <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>
586 <p>The format of the SelectiveBlurImage method is:</p>
589 Image *SelectiveBlurImage(const Image *image,const double radius,
590 const double sigma,const double threshold,ExceptionInfo *exception)
591 Image *SelectiveBlurImageChannel(const Image *image,
592 const ChannelType channel,const double radius,const double sigma,
593 const double threshold,ExceptionInfo *exception)
596 <p>A description of each parameter follows:</p>
602 <p>the channel type.</p>
605 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
608 <p>the standard deviation of the Gaussian, in pixels.</p>
611 <p>only pixels within this contrast threshold are included in the blur operation.</p>
614 <p>return any errors or warnings in this structure.</p>
617 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ShadeImage">ShadeImage</a></h2>
618 <div class="doc-section">
620 <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>
622 <p>The format of the ShadeImage method is:</p>
625 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
626 const double azimuth,const double elevation,ExceptionInfo *exception)
629 <p>A description of each parameter follows:</p>
635 <p>A value other than zero shades the intensity of each pixel.</p>
637 <h5>azimuth, elevation</h5>
638 <p>Define the light source direction.</p>
641 <p>return any errors or warnings in this structure.</p>
644 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SharpenImage">SharpenImage</a></h2>
645 <div class="doc-section">
647 <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>
649 <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>
651 <p>The format of the SharpenImage method is:</p>
654 Image *SharpenImage(const Image *image,const double radius,
655 const double sigma,ExceptionInfo *exception)
656 Image *SharpenImageChannel(const Image *image,const ChannelType channel,
657 const double radius,const double sigma,ExceptionInfo *exception)
660 <p>A description of each parameter follows:</p>
666 <p>the channel type.</p>
669 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
672 <p>the standard deviation of the Laplacian, in pixels.</p>
675 <p>return any errors or warnings in this structure.</p>
678 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SpreadImage">SpreadImage</a></h2>
679 <div class="doc-section">
681 <p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p>
683 <p>The format of the SpreadImage method is:</p>
686 Image *SpreadImage(const Image *image,const double radius,
687 ExceptionInfo *exception)
690 <p>A description of each parameter follows:</p>
696 <p>Choose a random pixel in a neighborhood of this extent.</p>
699 <p>return any errors or warnings in this structure.</p>
702 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="StatisticImage">StatisticImage</a></h2>
703 <div class="doc-section">
705 <p>StatisticImage() makes each pixel the min / max / median / mode / etc. of the neighborhood of the specified width and height.</p>
707 <p>The format of the StatisticImage method is:</p>
710 Image *StatisticImage(const Image *image,const StatisticType type,
711 const size_t width,const size_t height,ExceptionInfo *exception)
712 Image *StatisticImageChannel(const Image *image,
713 const ChannelType channel,const StatisticType type,
714 const size_t width,const size_t height,ExceptionInfo *exception)
717 <p>A description of each parameter follows:</p>
723 <p>the image channel.</p>
726 <p>the statistic type (median, mode, etc.).</p>
729 <p>the width of the pixel neighborhood.</p>
732 <p>the height of the pixel neighborhood.</p>
735 <p>return any errors or warnings in this structure.</p>
738 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="UnsharpMaskImage">UnsharpMaskImage</a></h2>
739 <div class="doc-section">
741 <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>
743 <p>The format of the UnsharpMaskImage method is:</p>
746 Image *UnsharpMaskImage(const Image *image,const double radius,
747 const double sigma,const double amount,const double threshold,
748 ExceptionInfo *exception)
749 Image *UnsharpMaskImageChannel(const Image *image,
750 const ChannelType channel,const double radius,const double sigma,
751 const double amount,const double threshold,ExceptionInfo *exception)
754 <p>A description of each parameter follows:</p>
760 <p>the channel type.</p>
763 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
766 <p>the standard deviation of the Gaussian, in pixels.</p>
769 <p>the percentage of the difference between the original and the blur image that is added back into the original.</p>
772 <p>the threshold in pixels needed to apply the diffence amount.</p>
775 <p>return any errors or warnings in this structure.</p>
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