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239 <h1>Module effect Methods</h1>
240 <p class="navigation-index">[<a href="effect.html#AdaptiveBlurImage">AdaptiveBlurImage</a> • <a href="effect.html#AdaptiveSharpenImage">AdaptiveSharpenImage</a> • <a href="effect.html#BlurImage">BlurImage</a> • <a href="effect.html#ConvolveImage">ConvolveImage</a> • <a href="effect.html#DespeckleImage">DespeckleImage</a> • <a href="effect.html#EdgeImage">EdgeImage</a> • <a href="effect.html#EmbossImage">EmbossImage</a> • <a href="effect.html#FilterImage">FilterImage</a> • <a href="effect.html#GaussianBlurImage">GaussianBlurImage</a> • <a href="effect.html#MotionBlurImage">MotionBlurImage</a> • <a href="effect.html#PreviewImage">PreviewImage</a> • <a href="effect.html#RadialBlurImage">RadialBlurImage</a> • <a href="effect.html#SelectiveBlurImage">SelectiveBlurImage</a> • <a href="effect.html#ShadeImage">ShadeImage</a> • <a href="effect.html#SharpenImage">SharpenImage</a> • <a href="effect.html#SpreadImage">SpreadImage</a> • <a href="effect.html#UnsharpMaskImage">UnsharpMaskImage</a>]</p>
242 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveBlurImage">AdaptiveBlurImage</a></h2>
243 <div class="doc-section">
245 <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>
247 <p>The format of the AdaptiveBlurImage method is:</p>
250 Image *AdaptiveBlurImage(const Image *image,const double radius,
251 const double sigma,ExceptionInfo *exception)
252 Image *AdaptiveBlurImageChannel(const Image *image,
253 const ChannelType channel,double radius,const double sigma,
254 ExceptionInfo *exception)
257 <p>A description of each parameter follows:</p>
263 <p>the channel type.</p>
266 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
269 <p>the standard deviation of the Laplacian, in pixels.</p>
272 <p>return any errors or warnings in this structure.</p>
275 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveSharpenImage">AdaptiveSharpenImage</a></h2>
276 <div class="doc-section">
278 <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>
280 <p>The format of the AdaptiveSharpenImage method is:</p>
283 Image *AdaptiveSharpenImage(const Image *image,const double radius,
284 const double sigma,ExceptionInfo *exception)
285 Image *AdaptiveSharpenImageChannel(const Image *image,
286 const ChannelType channel,double radius,const double sigma,
287 ExceptionInfo *exception)
290 <p>A description of each parameter follows:</p>
296 <p>the channel type.</p>
299 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
302 <p>the standard deviation of the Laplacian, in pixels.</p>
305 <p>return any errors or warnings in this structure.</p>
308 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="BlurImage">BlurImage</a></h2>
309 <div class="doc-section">
311 <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>
313 <p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p>
315 <p>The format of the BlurImage method is:</p>
318 Image *BlurImage(const Image *image,const double radius,
319 const double sigma,ExceptionInfo *exception)
320 Image *BlurImageChannel(const Image *image,const ChannelType channel,
321 const double radius,const double sigma,ExceptionInfo *exception)
324 <p>A description of each parameter follows:</p>
330 <p>the channel type.</p>
333 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
336 <p>the standard deviation of the Gaussian, in pixels.</p>
339 <p>return any errors or warnings in this structure.</p>
342 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ConvolveImage">ConvolveImage</a></h2>
343 <div class="doc-section">
345 <p>ConvolveImage() applies a custom convolution kernel to the image.</p>
347 <p>The format of the ConvolveImage method is:</p>
350 Image *ConvolveImage(const Image *image,const size_t order,
351 const double *kernel,ExceptionInfo *exception)
352 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
353 const size_t order,const double *kernel,ExceptionInfo *exception)
356 <p>A description of each parameter follows:</p>
362 <p>the channel type.</p>
365 <p>the number of columns and rows in the filter kernel.</p>
368 <p>An array of double representing the convolution kernel.</p>
371 <p>return any errors or warnings in this structure.</p>
374 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="DespeckleImage">DespeckleImage</a></h2>
375 <div class="doc-section">
377 <p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image. A speckle removing filter uses a complementary hulling technique (raising pixels that are darker than their surrounding neighbors, then complementarily lowering pixels that are brighter than their surrounding neighbors) to reduce the speckle index of that image (reference Crimmins speckle removal).</p>
379 <p>The format of the DespeckleImage method is:</p>
382 Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
385 <p>A description of each parameter follows:</p>
391 <p>return any errors or warnings in this structure.</p>
394 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EdgeImage">EdgeImage</a></h2>
395 <div class="doc-section">
397 <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>
399 <p>The format of the EdgeImage method is:</p>
402 Image *EdgeImage(const Image *image,const double radius,
403 ExceptionInfo *exception)
406 <p>A description of each parameter follows:</p>
412 <p>the radius of the pixel neighborhood.</p>
415 <p>return any errors or warnings in this structure.</p>
418 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EmbossImage">EmbossImage</a></h2>
419 <div class="doc-section">
421 <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>
423 <p>The format of the EmbossImage method is:</p>
426 Image *EmbossImage(const Image *image,const double radius,
427 const double sigma,ExceptionInfo *exception)
430 <p>A description of each parameter follows:</p>
436 <p>the radius of the pixel neighborhood.</p>
439 <p>the standard deviation of the Gaussian, in pixels.</p>
442 <p>return any errors or warnings in this structure.</p>
445 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="FilterImage">FilterImage</a></h2>
446 <div class="doc-section">
448 <p>FilterImage() applies a custom convolution kernel to the image.</p>
450 <p>The format of the FilterImage method is:</p>
453 Image *FilterImage(const Image *image,const KernelInfo *kernel,
454 ExceptionInfo *exception)
455 Image *FilterImageChannel(const Image *image,const ChannelType channel,
456 const KernelInfo *kernel,ExceptionInfo *exception)
459 <p>A description of each parameter follows:</p>
465 <p>the channel type.</p>
468 <p>the filtering kernel.</p>
471 <p>return any errors or warnings in this structure.</p>
474 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="GaussianBlurImage">GaussianBlurImage</a></h2>
475 <div class="doc-section">
477 <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>
479 <p>The format of the GaussianBlurImage method is:</p>
482 Image *GaussianBlurImage(const Image *image,onst double radius,
483 const double sigma,ExceptionInfo *exception)
484 Image *GaussianBlurImageChannel(const Image *image,
485 const ChannelType channel,const double radius,const double sigma,
486 ExceptionInfo *exception)
489 <p>A description of each parameter follows:</p>
495 <p>the channel type.</p>
498 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
501 <p>the standard deviation of the Gaussian, in pixels.</p>
504 <p>return any errors or warnings in this structure.</p>
507 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="MotionBlurImage">MotionBlurImage</a></h2>
508 <div class="doc-section">
510 <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>
512 <p>Andrew Protano contributed this effect.</p>
514 <p>The format of the MotionBlurImage method is:</p>
517 Image *MotionBlurImage(const Image *image,const double radius,
518 const double sigma,const double angle,ExceptionInfo *exception)
519 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
520 const double radius,const double sigma,const double angle,
521 ExceptionInfo *exception)
524 <p>A description of each parameter follows:</p>
530 <p>the channel type.</p>
533 <p>the radius of the Gaussian, in pixels, not counting the center</p>
535 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
538 <p>the standard deviation of the Gaussian, in pixels.</p>
541 <p>Apply the effect along this angle.</p>
544 <p>return any errors or warnings in this structure.</p>
547 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="PreviewImage">PreviewImage</a></h2>
548 <div class="doc-section">
550 <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>
552 <p>The format of the PreviewImages method is:</p>
555 Image *PreviewImages(const Image *image,const PreviewType preview,
556 ExceptionInfo *exception)
559 <p>A description of each parameter follows:</p>
565 <p>the image processing operation.</p>
568 <p>return any errors or warnings in this structure.</p>
571 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="RadialBlurImage">RadialBlurImage</a></h2>
572 <div class="doc-section">
574 <p>RadialBlurImage() applies a radial blur to the image.</p>
576 <p>Andrew Protano contributed this effect.</p>
578 <p>The format of the RadialBlurImage method is:</p>
581 Image *RadialBlurImage(const Image *image,const double angle,
582 ExceptionInfo *exception)
583 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
584 const double angle,ExceptionInfo *exception)
587 <p>A description of each parameter follows:</p>
593 <p>the channel type.</p>
596 <p>the angle of the radial blur.</p>
599 <p>return any errors or warnings in this structure.</p>
602 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SelectiveBlurImage">SelectiveBlurImage</a></h2>
603 <div class="doc-section">
605 <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>
607 <p>The format of the SelectiveBlurImage method is:</p>
610 Image *SelectiveBlurImage(const Image *image,const double radius,
611 const double sigma,const double threshold,ExceptionInfo *exception)
612 Image *SelectiveBlurImageChannel(const Image *image,
613 const ChannelType channel,const double radius,const double sigma,
614 const double threshold,ExceptionInfo *exception)
617 <p>A description of each parameter follows:</p>
623 <p>the channel type.</p>
626 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
629 <p>the standard deviation of the Gaussian, in pixels.</p>
632 <p>only pixels within this contrast threshold are included in the blur operation.</p>
635 <p>return any errors or warnings in this structure.</p>
638 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ShadeImage">ShadeImage</a></h2>
639 <div class="doc-section">
641 <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>
643 <p>The format of the ShadeImage method is:</p>
646 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
647 const double azimuth,const double elevation,ExceptionInfo *exception)
650 <p>A description of each parameter follows:</p>
656 <p>A value other than zero shades the intensity of each pixel.</p>
658 <h5>azimuth, elevation</h5>
659 <p>Define the light source direction.</p>
662 <p>return any errors or warnings in this structure.</p>
665 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SharpenImage">SharpenImage</a></h2>
666 <div class="doc-section">
668 <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>
670 <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>
672 <p>The format of the SharpenImage method is:</p>
675 Image *SharpenImage(const Image *image,const double radius,
676 const double sigma,ExceptionInfo *exception)
677 Image *SharpenImageChannel(const Image *image,const ChannelType channel,
678 const double radius,const double sigma,ExceptionInfo *exception)
681 <p>A description of each parameter follows:</p>
687 <p>the channel type.</p>
690 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
693 <p>the standard deviation of the Laplacian, in pixels.</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="SpreadImage">SpreadImage</a></h2>
700 <div class="doc-section">
702 <p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p>
704 <p>The format of the SpreadImage method is:</p>
707 Image *SpreadImage(const Image *image,const double radius,
708 ExceptionInfo *exception)
711 <p>A description of each parameter follows:</p>
717 <p>Choose a random pixel in a neighborhood of this extent.</p>
720 <p>return any errors or warnings in this structure.</p>
723 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="UnsharpMaskImage">UnsharpMaskImage</a></h2>
724 <div class="doc-section">
726 <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>
728 <p>The format of the UnsharpMaskImage method is:</p>
731 Image *UnsharpMaskImage(const Image *image,const double radius,
732 const double sigma,const double amount,const double threshold,
733 ExceptionInfo *exception)
734 Image *UnsharpMaskImageChannel(const Image *image,
735 const ChannelType channel,const double radius,const double sigma,
736 const double amount,const double threshold,ExceptionInfo *exception)
739 <p>A description of each parameter follows:</p>
745 <p>the channel type.</p>
748 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
751 <p>the standard deviation of the Gaussian, in pixels.</p>
754 <p>the percentage of the difference between the original and the blur image that is added back into the original.</p>
757 <p>the threshold in pixels needed to apply the diffence amount.</p>
760 <p>return any errors or warnings in this structure.</p>
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