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167 <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="#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>
169 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
170 _8c.html" target="source" name="AdaptiveBlurImage">AdaptiveBlurImage</a></h2>
171 <div class="doc-section">
173 <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></ol>
175 <p>The format of the AdaptiveBlurImage method is:</p>
178 Image *AdaptiveBlurImage(const Image *image,const double radius,
179 const double sigma,ExceptionInfo *exception)
180 Image *AdaptiveBlurImageChannel(const Image *image,
181 const ChannelType channel,double radius,const double sigma,
182 ExceptionInfo *exception)
185 <p>A description of each parameter follows:</p></ol>
188 <ol><p>the image.</p></ol>
191 <ol><p>the channel type.</p></ol>
194 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
197 <ol><p>the standard deviation of the Laplacian, in pixels.</p></ol>
200 <ol><p>return any errors or warnings in this structure.</p></ol>
203 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
204 _8c.html" target="source" name="AdaptiveSharpenImage">AdaptiveSharpenImage</a></h2>
205 <div class="doc-section">
207 <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></ol>
209 <p>The format of the AdaptiveSharpenImage method is:</p>
212 Image *AdaptiveSharpenImage(const Image *image,const double radius,
213 const double sigma,ExceptionInfo *exception)
214 Image *AdaptiveSharpenImageChannel(const Image *image,
215 const ChannelType channel,double radius,const double sigma,
216 ExceptionInfo *exception)
219 <p>A description of each parameter follows:</p></ol>
222 <ol><p>the image.</p></ol>
225 <ol><p>the channel type.</p></ol>
228 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
231 <ol><p>the standard deviation of the Laplacian, in pixels.</p></ol>
234 <ol><p>return any errors or warnings in this structure.</p></ol>
237 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
238 _8c.html" target="source" name="BlurImage">BlurImage</a></h2>
239 <div class="doc-section">
241 <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></ol>
243 <p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p></ol>
245 <p>The format of the BlurImage method is:</p>
248 Image *BlurImage(const Image *image,const double radius,
249 const double sigma,ExceptionInfo *exception)
250 Image *BlurImageChannel(const Image *image,const ChannelType channel,
251 const double radius,const double sigma,ExceptionInfo *exception)
254 <p>A description of each parameter follows:</p></ol>
257 <ol><p>the image.</p></ol>
260 <ol><p>the channel type.</p></ol>
263 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
266 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
269 <ol><p>return any errors or warnings in this structure.</p></ol>
272 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
273 _8c.html" target="source" name="ConvolveImage">ConvolveImage</a></h2>
274 <div class="doc-section">
276 <p>ConvolveImage() applies a custom convolution kernel to the image.</p></ol>
278 <p>The format of the ConvolveImage method is:</p>
281 Image *ConvolveImage(const Image *image,const size_t order,
282 const double *kernel,ExceptionInfo *exception)
283 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
284 const size_t order,const double *kernel,
285 ExceptionInfo *exception)
288 <p>A description of each parameter follows:</p></ol>
291 <ol><p>the image.</p></ol>
294 <ol><p>the channel type.</p></ol>
297 <ol><p>the number of columns and rows in the filter kernel.</p></ol>
300 <ol><p>An array of double representing the convolution kernel.</p></ol>
303 <ol><p>return any errors or warnings in this structure.</p></ol>
306 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
307 _8c.html" target="source" name="DespeckleImage">DespeckleImage</a></h2>
308 <div class="doc-section">
310 <p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p></ol>
312 <p>The format of the DespeckleImage method is:</p>
315 Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
318 <p>A description of each parameter follows:</p></ol>
321 <ol><p>the image.</p></ol>
324 <ol><p>return any errors or warnings in this structure.</p></ol>
327 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
328 _8c.html" target="source" name="EdgeImage">EdgeImage</a></h2>
329 <div class="doc-section">
331 <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></ol>
333 <p>The format of the EdgeImage method is:</p>
336 Image *EdgeImage(const Image *image,const double radius,
337 ExceptionInfo *exception)
340 <p>A description of each parameter follows:</p></ol>
343 <ol><p>the image.</p></ol>
346 <ol><p>the radius of the pixel neighborhood.</p></ol>
349 <ol><p>return any errors or warnings in this structure.</p></ol>
352 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
353 _8c.html" target="source" name="EmbossImage">EmbossImage</a></h2>
354 <div class="doc-section">
356 <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></ol>
358 <p>The format of the EmbossImage method is:</p>
361 Image *EmbossImage(const Image *image,const double radius,
362 const double sigma,ExceptionInfo *exception)
365 <p>A description of each parameter follows:</p></ol>
368 <ol><p>the image.</p></ol>
371 <ol><p>the radius of the pixel neighborhood.</p></ol>
374 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
377 <ol><p>return any errors or warnings in this structure.</p></ol>
380 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
381 _8c.html" target="source" name="FilterImage">FilterImage</a></h2>
382 <div class="doc-section">
384 <p>FilterImage() applies a custom convolution kernel to the image.</p></ol>
386 <p>The format of the FilterImage method is:</p>
389 Image *FilterImage(const Image *image,const KernelInfo *kernel,
390 ExceptionInfo *exception)
391 Image *FilterImageChannel(const Image *image,const ChannelType channel,
392 const KernelInfo *kernel,ExceptionInfo *exception)
395 <p>A description of each parameter follows:</p></ol>
398 <ol><p>the image.</p></ol>
401 <ol><p>the channel type.</p></ol>
404 <ol><p>the filtering kernel.</p></ol>
407 <ol><p>return any errors or warnings in this structure.</p></ol>
410 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
411 _8c.html" target="source" name="GaussianBlurImage">GaussianBlurImage</a></h2>
412 <div class="doc-section">
414 <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></ol>
416 <p>The format of the GaussianBlurImage method is:</p>
419 Image *GaussianBlurImage(const Image *image,onst double radius,
420 const double sigma,ExceptionInfo *exception)
421 Image *GaussianBlurImageChannel(const Image *image,
422 const ChannelType channel,const double radius,const double sigma,
423 ExceptionInfo *exception)
426 <p>A description of each parameter follows:</p></ol>
429 <ol><p>the image.</p></ol>
432 <ol><p>the channel type.</p></ol>
435 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
438 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
441 <ol><p>return any errors or warnings in this structure.</p></ol>
444 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
445 _8c.html" target="source" name="MedianFilterImage">MedianFilterImage</a></h2>
446 <div class="doc-section">
448 <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></ol>
450 <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></ol>
452 <p>The format of the MedianFilterImage method is:</p>
455 Image *MedianFilterImage(const Image *image,const double radius,
456 ExceptionInfo *exception)
459 <p>A description of each parameter follows:</p></ol>
462 <ol><p>the image.</p></ol>
465 <ol><p>the radius of the pixel neighborhood.</p></ol>
468 <ol><p>return any errors or warnings in this structure.</p></ol>
471 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
472 _8c.html" target="source" name="MotionBlurImage">MotionBlurImage</a></h2>
473 <div class="doc-section">
475 <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></ol>
477 <p>Andrew Protano contributed this effect.</p></ol>
479 <p>The format of the MotionBlurImage method is:</p>
482 Image *MotionBlurImage(const Image *image,const double radius,
483 const double sigma,const double angle,ExceptionInfo *exception)
484 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
485 const double radius,const double sigma,const double angle,
486 ExceptionInfo *exception)
489 <p>A description of each parameter follows:</p></ol>
492 <ol><p>the image.</p></ol>
495 <ol><p>the channel type.</p></ol>
498 <ol><p>the radius of the Gaussian, in pixels, not counting the center</p>
500 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
503 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
506 <ol><p>Apply the effect along this angle.</p></ol>
509 <ol><p>return any errors or warnings in this structure.</p></ol>
512 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
513 _8c.html" target="source" name="PreviewImage">PreviewImage</a></h2>
514 <div class="doc-section">
516 <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></ol>
518 <p>The format of the PreviewImages method is:</p>
521 Image *PreviewImages(const Image *image,const PreviewType preview,
522 ExceptionInfo *exception)
525 <p>A description of each parameter follows:</p></ol>
528 <ol><p>the image.</p></ol>
531 <ol><p>the image processing operation.</p></ol>
534 <ol><p>return any errors or warnings in this structure.</p></ol>
537 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
538 _8c.html" target="source" name="RadialBlurImage">RadialBlurImage</a></h2>
539 <div class="doc-section">
541 <p>RadialBlurImage() applies a radial blur to the image.</p></ol>
543 <p>Andrew Protano contributed this effect.</p></ol>
545 <p>The format of the RadialBlurImage method is:</p>
548 Image *RadialBlurImage(const Image *image,const double angle,
549 ExceptionInfo *exception)
550 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
551 const double angle,ExceptionInfo *exception)
554 <p>A description of each parameter follows:</p></ol>
557 <ol><p>the image.</p></ol>
560 <ol><p>the channel type.</p></ol>
563 <ol><p>the angle of the radial blur.</p></ol>
566 <ol><p>return any errors or warnings in this structure.</p></ol>
569 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
570 _8c.html" target="source" name="ReduceNoiseImage">ReduceNoiseImage</a></h2>
571 <div class="doc-section">
573 <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></ol>
575 <p>The format of the ReduceNoiseImage method is:</p>
578 Image *ReduceNoiseImage(const Image *image,const double radius,
579 ExceptionInfo *exception)
582 <p>A description of each parameter follows:</p></ol>
585 <ol><p>the image.</p></ol>
588 <ol><p>the radius of the pixel neighborhood.</p></ol>
591 <ol><p>return any errors or warnings in this structure.</p></ol>
594 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
595 _8c.html" target="source" name="SelectiveBlurImage">SelectiveBlurImage</a></h2>
596 <div class="doc-section">
598 <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></ol>
600 <p>The format of the SelectiveBlurImage method is:</p>
603 Image *SelectiveBlurImage(const Image *image,const double radius,
604 const double sigma,const double threshold,ExceptionInfo *exception)
605 Image *SelectiveBlurImageChannel(const Image *image,
606 const ChannelType channel,const double radius,const double sigma,
607 const double threshold,ExceptionInfo *exception)
610 <p>A description of each parameter follows:</p></ol>
613 <ol><p>the image.</p></ol>
616 <ol><p>the channel type.</p></ol>
619 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
622 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
625 <ol><p>only pixels within this contrast threshold are included in the blur operation.</p></ol>
628 <ol><p>return any errors or warnings in this structure.</p></ol>
631 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
632 _8c.html" target="source" name="ShadeImage">ShadeImage</a></h2>
633 <div class="doc-section">
635 <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></ol>
637 <p>The format of the ShadeImage method is:</p>
640 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
641 const double azimuth,const double elevation,ExceptionInfo *exception)
644 <p>A description of each parameter follows:</p></ol>
647 <ol><p>the image.</p></ol>
650 <ol><p>A value other than zero shades the intensity of each pixel.</p></ol>
652 <h5>azimuth, elevation</h5>
653 <ol><p>Define the light source direction.</p></ol>
656 <ol><p>return any errors or warnings in this structure.</p></ol>
659 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
660 _8c.html" target="source" name="SharpenImage">SharpenImage</a></h2>
661 <div class="doc-section">
663 <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></ol>
665 <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></ol>
667 <p>The format of the SharpenImage method is:</p>
670 Image *SharpenImage(const Image *image,const double radius,
671 const double sigma,ExceptionInfo *exception)
672 Image *SharpenImageChannel(const Image *image,const ChannelType channel,
673 const double radius,const double sigma,ExceptionInfo *exception)
676 <p>A description of each parameter follows:</p></ol>
679 <ol><p>the image.</p></ol>
682 <ol><p>the channel type.</p></ol>
685 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
688 <ol><p>the standard deviation of the Laplacian, in pixels.</p></ol>
691 <ol><p>return any errors or warnings in this structure.</p></ol>
694 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
695 _8c.html" target="source" name="SpreadImage">SpreadImage</a></h2>
696 <div class="doc-section">
698 <p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p></ol>
700 <p>The format of the SpreadImage method is:</p>
703 Image *SpreadImage(const Image *image,const double radius,
704 ExceptionInfo *exception)
707 <p>A description of each parameter follows:</p></ol>
710 <ol><p>the image.</p></ol>
713 <ol><p>Choose a random pixel in a neighborhood of this extent.</p></ol>
716 <ol><p>return any errors or warnings in this structure.</p></ol>
719 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
720 _8c.html" target="source" name="UnsharpMaskImage">UnsharpMaskImage</a></h2>
721 <div class="doc-section">
723 <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></ol>
725 <p>The format of the UnsharpMaskImage method is:</p>
728 Image *UnsharpMaskImage(const Image *image,const double radius,
729 const double sigma,const double amount,const double threshold,
730 ExceptionInfo *exception)
731 Image *UnsharpMaskImageChannel(const Image *image,
732 const ChannelType channel,const double radius,const double sigma,
733 const double amount,const double threshold,ExceptionInfo *exception)
736 <p>A description of each parameter follows:</p></ol>
739 <ol><p>the image.</p></ol>
742 <ol><p>the channel type.</p></ol>
745 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
748 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
751 <ol><p>the percentage of the difference between the original and the blur image that is added back into the original.</p></ol>
754 <ol><p>the threshold in pixels needed to apply the diffence amount.</p></ol>
757 <ol><p>return any errors or warnings in this structure.</p></ol>
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