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173 <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>
175 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
176 _8c.html" target="source" name="AdaptiveBlurImage">AdaptiveBlurImage</a></h2>
177 <div class="doc-section">
179 <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>
181 <p>The format of the AdaptiveBlurImage method is:</p>
184 Image *AdaptiveBlurImage(const Image *image,const double radius,
185 const double sigma,ExceptionInfo *exception)
186 Image *AdaptiveBlurImageChannel(const Image *image,
187 const ChannelType channel,double radius,const double sigma,
188 ExceptionInfo *exception)
191 <p>A description of each parameter follows:</p></ol>
194 <ol><p>the image.</p></ol>
197 <ol><p>the channel type.</p></ol>
200 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
203 <ol><p>the standard deviation of the Laplacian, in pixels.</p></ol>
206 <ol><p>return any errors or warnings in this structure.</p></ol>
209 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
210 _8c.html" target="source" name="AdaptiveSharpenImage">AdaptiveSharpenImage</a></h2>
211 <div class="doc-section">
213 <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>
215 <p>The format of the AdaptiveSharpenImage method is:</p>
218 Image *AdaptiveSharpenImage(const Image *image,const double radius,
219 const double sigma,ExceptionInfo *exception)
220 Image *AdaptiveSharpenImageChannel(const Image *image,
221 const ChannelType channel,double radius,const double sigma,
222 ExceptionInfo *exception)
225 <p>A description of each parameter follows:</p></ol>
228 <ol><p>the image.</p></ol>
231 <ol><p>the channel type.</p></ol>
234 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
237 <ol><p>the standard deviation of the Laplacian, in pixels.</p></ol>
240 <ol><p>return any errors or warnings in this structure.</p></ol>
243 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
244 _8c.html" target="source" name="BlurImage">BlurImage</a></h2>
245 <div class="doc-section">
247 <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>
249 <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>
251 <p>The format of the BlurImage method is:</p>
254 Image *BlurImage(const Image *image,const double radius,
255 const double sigma,ExceptionInfo *exception)
256 Image *BlurImageChannel(const Image *image,const ChannelType channel,
257 const double radius,const double sigma,ExceptionInfo *exception)
260 <p>A description of each parameter follows:</p></ol>
263 <ol><p>the image.</p></ol>
266 <ol><p>the channel type.</p></ol>
269 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
272 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
275 <ol><p>return any errors or warnings in this structure.</p></ol>
278 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
279 _8c.html" target="source" name="ConvolveImage">ConvolveImage</a></h2>
280 <div class="doc-section">
282 <p>ConvolveImage() applies a custom convolution kernel to the image.</p></ol>
284 <p>The format of the ConvolveImage method is:</p>
287 Image *ConvolveImage(const Image *image,const size_t order,
288 const double *kernel,ExceptionInfo *exception)
289 Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
290 const size_t order,const double *kernel,ExceptionInfo *exception)
293 <p>A description of each parameter follows:</p></ol>
296 <ol><p>the image.</p></ol>
299 <ol><p>the channel type.</p></ol>
302 <ol><p>the number of columns and rows in the filter kernel.</p></ol>
305 <ol><p>An array of double representing the convolution kernel.</p></ol>
308 <ol><p>return any errors or warnings in this structure.</p></ol>
311 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
312 _8c.html" target="source" name="DespeckleImage">DespeckleImage</a></h2>
313 <div class="doc-section">
315 <p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p></ol>
317 <p>The format of the DespeckleImage method is:</p>
320 Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
323 <p>A description of each parameter follows:</p></ol>
326 <ol><p>the image.</p></ol>
329 <ol><p>return any errors or warnings in this structure.</p></ol>
332 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
333 _8c.html" target="source" name="EdgeImage">EdgeImage</a></h2>
334 <div class="doc-section">
336 <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>
338 <p>The format of the EdgeImage method is:</p>
341 Image *EdgeImage(const Image *image,const double radius,
342 ExceptionInfo *exception)
345 <p>A description of each parameter follows:</p></ol>
348 <ol><p>the image.</p></ol>
351 <ol><p>the radius of the pixel neighborhood.</p></ol>
354 <ol><p>return any errors or warnings in this structure.</p></ol>
357 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
358 _8c.html" target="source" name="EmbossImage">EmbossImage</a></h2>
359 <div class="doc-section">
361 <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>
363 <p>The format of the EmbossImage method is:</p>
366 Image *EmbossImage(const Image *image,const double radius,
367 const double sigma,ExceptionInfo *exception)
370 <p>A description of each parameter follows:</p></ol>
373 <ol><p>the image.</p></ol>
376 <ol><p>the radius of the pixel neighborhood.</p></ol>
379 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
382 <ol><p>return any errors or warnings in this structure.</p></ol>
385 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
386 _8c.html" target="source" name="FilterImage">FilterImage</a></h2>
387 <div class="doc-section">
389 <p>FilterImage() applies a custom convolution kernel to the image.</p></ol>
391 <p>The format of the FilterImage method is:</p>
394 Image *FilterImage(const Image *image,const KernelInfo *kernel,
395 ExceptionInfo *exception)
396 Image *FilterImageChannel(const Image *image,const ChannelType channel,
397 const KernelInfo *kernel,ExceptionInfo *exception)
400 <p>A description of each parameter follows:</p></ol>
403 <ol><p>the image.</p></ol>
406 <ol><p>the channel type.</p></ol>
409 <ol><p>the filtering kernel.</p></ol>
412 <ol><p>return any errors or warnings in this structure.</p></ol>
415 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
416 _8c.html" target="source" name="GaussianBlurImage">GaussianBlurImage</a></h2>
417 <div class="doc-section">
419 <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>
421 <p>The format of the GaussianBlurImage method is:</p>
424 Image *GaussianBlurImage(const Image *image,onst double radius,
425 const double sigma,ExceptionInfo *exception)
426 Image *GaussianBlurImageChannel(const Image *image,
427 const ChannelType channel,const double radius,const double sigma,
428 ExceptionInfo *exception)
431 <p>A description of each parameter follows:</p></ol>
434 <ol><p>the image.</p></ol>
437 <ol><p>the channel type.</p></ol>
440 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
443 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
446 <ol><p>return any errors or warnings in this structure.</p></ol>
449 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
450 _8c.html" target="source" name="MedianFilterImage">MedianFilterImage</a></h2>
451 <div class="doc-section">
453 <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>
455 <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>
457 <p>The format of the MedianFilterImage method is:</p>
460 Image *MedianFilterImage(const Image *image,const double radius,
461 ExceptionInfo *exception)
464 <p>A description of each parameter follows:</p></ol>
467 <ol><p>the image.</p></ol>
470 <ol><p>the radius of the pixel neighborhood.</p></ol>
473 <ol><p>return any errors or warnings in this structure.</p></ol>
476 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
477 _8c.html" target="source" name="MotionBlurImage">MotionBlurImage</a></h2>
478 <div class="doc-section">
480 <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>
482 <p>Andrew Protano contributed this effect.</p></ol>
484 <p>The format of the MotionBlurImage method is:</p>
487 Image *MotionBlurImage(const Image *image,const double radius,
488 const double sigma,const double angle,ExceptionInfo *exception)
489 Image *MotionBlurImageChannel(const Image *image,const ChannelType channel,
490 const double radius,const double sigma,const double angle,
491 ExceptionInfo *exception)
494 <p>A description of each parameter follows:</p></ol>
497 <ol><p>the image.</p></ol>
500 <ol><p>the channel type.</p></ol>
503 <ol><p>the radius of the Gaussian, in pixels, not counting the center</p>
505 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
508 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
511 <ol><p>Apply the effect along this angle.</p></ol>
514 <ol><p>return any errors or warnings in this structure.</p></ol>
517 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
518 _8c.html" target="source" name="PreviewImage">PreviewImage</a></h2>
519 <div class="doc-section">
521 <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>
523 <p>The format of the PreviewImages method is:</p>
526 Image *PreviewImages(const Image *image,const PreviewType preview,
527 ExceptionInfo *exception)
530 <p>A description of each parameter follows:</p></ol>
533 <ol><p>the image.</p></ol>
536 <ol><p>the image processing operation.</p></ol>
539 <ol><p>return any errors or warnings in this structure.</p></ol>
542 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
543 _8c.html" target="source" name="RadialBlurImage">RadialBlurImage</a></h2>
544 <div class="doc-section">
546 <p>RadialBlurImage() applies a radial blur to the image.</p></ol>
548 <p>Andrew Protano contributed this effect.</p></ol>
550 <p>The format of the RadialBlurImage method is:</p>
553 Image *RadialBlurImage(const Image *image,const double angle,
554 ExceptionInfo *exception)
555 Image *RadialBlurImageChannel(const Image *image,const ChannelType channel,
556 const double angle,ExceptionInfo *exception)
559 <p>A description of each parameter follows:</p></ol>
562 <ol><p>the image.</p></ol>
565 <ol><p>the channel type.</p></ol>
568 <ol><p>the angle of the radial blur.</p></ol>
571 <ol><p>return any errors or warnings in this structure.</p></ol>
574 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
575 _8c.html" target="source" name="ReduceNoiseImage">ReduceNoiseImage</a></h2>
576 <div class="doc-section">
578 <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>
580 <p>The format of the ReduceNoiseImage method is:</p>
583 Image *ReduceNoiseImage(const Image *image,const double radius,
584 ExceptionInfo *exception)
587 <p>A description of each parameter follows:</p></ol>
590 <ol><p>the image.</p></ol>
593 <ol><p>the radius of the pixel neighborhood.</p></ol>
596 <ol><p>return any errors or warnings in this structure.</p></ol>
599 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
600 _8c.html" target="source" name="SelectiveBlurImage">SelectiveBlurImage</a></h2>
601 <div class="doc-section">
603 <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>
605 <p>The format of the SelectiveBlurImage method is:</p>
608 Image *SelectiveBlurImage(const Image *image,const double radius,
609 const double sigma,const double threshold,ExceptionInfo *exception)
610 Image *SelectiveBlurImageChannel(const Image *image,
611 const ChannelType channel,const double radius,const double sigma,
612 const double threshold,ExceptionInfo *exception)
615 <p>A description of each parameter follows:</p></ol>
618 <ol><p>the image.</p></ol>
621 <ol><p>the channel type.</p></ol>
624 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
627 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
630 <ol><p>only pixels within this contrast threshold are included in the blur operation.</p></ol>
633 <ol><p>return any errors or warnings in this structure.</p></ol>
636 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
637 _8c.html" target="source" name="ShadeImage">ShadeImage</a></h2>
638 <div class="doc-section">
640 <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>
642 <p>The format of the ShadeImage method is:</p>
645 Image *ShadeImage(const Image *image,const MagickBooleanType gray,
646 const double azimuth,const double elevation,ExceptionInfo *exception)
649 <p>A description of each parameter follows:</p></ol>
652 <ol><p>the image.</p></ol>
655 <ol><p>A value other than zero shades the intensity of each pixel.</p></ol>
657 <h5>azimuth, elevation</h5>
658 <ol><p>Define the light source direction.</p></ol>
661 <ol><p>return any errors or warnings in this structure.</p></ol>
664 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
665 _8c.html" target="source" name="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></ol>
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></ol>
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></ol>
684 <ol><p>the image.</p></ol>
687 <ol><p>the channel type.</p></ol>
690 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
693 <ol><p>the standard deviation of the Laplacian, in pixels.</p></ol>
696 <ol><p>return any errors or warnings in this structure.</p></ol>
699 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
700 _8c.html" target="source" name="SpreadImage">SpreadImage</a></h2>
701 <div class="doc-section">
703 <p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p></ol>
705 <p>The format of the SpreadImage method is:</p>
708 Image *SpreadImage(const Image *image,const double radius,
709 ExceptionInfo *exception)
712 <p>A description of each parameter follows:</p></ol>
715 <ol><p>the image.</p></ol>
718 <ol><p>Choose a random pixel in a neighborhood of this extent.</p></ol>
721 <ol><p>return any errors or warnings in this structure.</p></ol>
724 <h2><a href="http://www.imagemagick.org/api/MagickCore/effect
725 _8c.html" target="source" name="UnsharpMaskImage">UnsharpMaskImage</a></h2>
726 <div class="doc-section">
728 <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>
730 <p>The format of the UnsharpMaskImage method is:</p>
733 Image *UnsharpMaskImage(const Image *image,const double radius,
734 const double sigma,const double amount,const double threshold,
735 ExceptionInfo *exception)
736 Image *UnsharpMaskImageChannel(const Image *image,
737 const ChannelType channel,const double radius,const double sigma,
738 const double amount,const double threshold,ExceptionInfo *exception)
741 <p>A description of each parameter follows:</p></ol>
744 <ol><p>the image.</p></ol>
747 <ol><p>the channel type.</p></ol>
750 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
753 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
756 <ol><p>the percentage of the difference between the original and the blur image that is added back into the original.</p></ol>
759 <ol><p>the threshold in pixels needed to apply the diffence amount.</p></ol>
762 <ol><p>return any errors or warnings in this structure.</p></ol>
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