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<h1>Module effect Methods</h1>
<p class="navigation-index">[<a href="#AdaptiveBlurImage">AdaptiveBlurImage</a> &bull; <a href="#AdaptiveSharpenImage">AdaptiveSharpenImage</a> &bull; <a href="#BlurImage">BlurImage</a> &bull; <a href="#ConvolveImage">ConvolveImage</a> &bull; <a href="#DespeckleImage">DespeckleImage</a> &bull; <a href="#EdgeImage">EdgeImage</a> &bull; <a href="#EmbossImage">EmbossImage</a> &bull; <a href="#GaussianBlurImage">GaussianBlurImage</a> &bull; <a href="#MotionBlurImage">MotionBlurImage</a> &bull; <a href="#PreviewImage">PreviewImage</a> &bull; <a href="#RadialBlurImage">RadialBlurImage</a> &bull; <a href="#SelectiveBlurImage">SelectiveBlurImage</a> &bull; <a href="#ShadeImage">ShadeImage</a> &bull; <a href="#SharpenImage">SharpenImage</a> &bull; <a href="#SpreadImage">SpreadImage</a> &bull; <a href="#StatisticImage">StatisticImage</a> &bull; <a href="#UnsharpMaskImage">UnsharpMaskImage</a>]</p>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveBlurImage">AdaptiveBlurImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the AdaptiveBlurImage method is:</p>
<pre class="code">
Image *AdaptiveBlurImage(const Image *image,const double radius,
const double sigma,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Laplacian, in pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="AdaptiveSharpenImage">AdaptiveSharpenImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the AdaptiveSharpenImage method is:</p>
<pre class="code">
Image *AdaptiveSharpenImage(const Image *image,const double radius,
const double sigma,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Laplacian, in pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="BlurImage">BlurImage</a></h2>
<div class="doc-section">
<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>
<p>BlurImage() differs from GaussianBlurImage() in that it uses a separable kernel which is faster but mathematically equivalent to the non-separable kernel.</p>
<p>The format of the BlurImage method is:</p>
<pre class="code">
Image *BlurImage(const Image *image,const double radius,
const double sigma,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Gaussian, in pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ConvolveImage">ConvolveImage</a></h2>
<div class="doc-section">
<p>ConvolveImage() applies a custom convolution kernel to the image.</p>
<p>The format of the ConvolveImage method is:</p>
<pre class="code">
Image *ConvolveImage(const Image *image,const KernelInfo *kernel,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>kernel</h5>
<p>the filtering kernel.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="DespeckleImage">DespeckleImage</a></h2>
<div class="doc-section">
<p>DespeckleImage() reduces the speckle noise in an image while perserving the edges of the original image.</p>
<p>The format of the DespeckleImage method is:</p>
<pre class="code">
Image *DespeckleImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EdgeImage">EdgeImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the EdgeImage method is:</p>
<pre class="code">
Image *EdgeImage(const Image *image,const double radius,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the pixel neighborhood.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="EmbossImage">EmbossImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the EmbossImage method is:</p>
<pre class="code">
Image *EmbossImage(const Image *image,const double radius,
const double sigma,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the pixel neighborhood.</p>
<h5>sigma</h5>
<p>the standard deviation of the Gaussian, in pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="GaussianBlurImage">GaussianBlurImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the GaussianBlurImage method is:</p>
<pre class="code">
Image *GaussianBlurImage(const Image *image,onst double radius,
const double sigma,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Gaussian, in pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="MotionBlurImage">MotionBlurImage</a></h2>
<div class="doc-section">
<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>
<p>Andrew Protano contributed this effect.</p>
<p>The format of the MotionBlurImage method is:</p>
<pre class="code">
Image *MotionBlurImage(const Image *image,const double radius,
const double sigma,const double angle,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Gaussian, in pixels.</p>
<h5>angle</h5>
<p>Apply the effect along this angle.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="PreviewImage">PreviewImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the PreviewImages method is:</p>
<pre class="code">
Image *PreviewImages(const Image *image,const PreviewType preview,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>preview</h5>
<p>the image processing operation.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="RadialBlurImage">RadialBlurImage</a></h2>
<div class="doc-section">
<p>RadialBlurImage() applies a radial blur to the image.</p>
<p>Andrew Protano contributed this effect.</p>
<p>The format of the RadialBlurImage method is:</p>
<pre class="code">
Image *RadialBlurImage(const Image *image,const double angle,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>angle</h5>
<p>the angle of the radial blur.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SelectiveBlurImage">SelectiveBlurImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the SelectiveBlurImage method is:</p>
<pre class="code">
Image *SelectiveBlurImage(const Image *image,const double radius,
const double sigma,const double threshold,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Gaussian, in pixels.</p>
<h5>threshold</h5>
<p>only pixels within this contrast threshold are included in the blur operation.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="ShadeImage">ShadeImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the ShadeImage method is:</p>
<pre class="code">
Image *ShadeImage(const Image *image,const MagickBooleanType gray,
const double azimuth,const double elevation,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>gray</h5>
<p>A value other than zero shades the intensity of each pixel.</p>
<h5>azimuth, elevation</h5>
<p>Define the light source direction.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SharpenImage">SharpenImage</a></h2>
<div class="doc-section">
<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>
<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>
<p>The format of the SharpenImage method is:</p>
<pre class="code">
Image *SharpenImage(const Image *image,const double radius,
const double sigma,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Laplacian, in pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="SpreadImage">SpreadImage</a></h2>
<div class="doc-section">
<p>SpreadImage() is a special effects method that randomly displaces each pixel in a block defined by the radius parameter.</p>
<p>The format of the SpreadImage method is:</p>
<pre class="code">
Image *SpreadImage(const Image *image,const double radius,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>Choose a random pixel in a neighborhood of this extent.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="StatisticImage">StatisticImage</a></h2>
<div class="doc-section">
<p>StatisticImage() makes each pixel the min / max / median / mode / etc. of the neighborhood of the specified width and height.</p>
<p>The format of the StatisticImage method is:</p>
<pre class="code">
Image *StatisticImage(const Image *image,const StatisticType type,
const size_t width,const size_t height,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>type</h5>
<p>the statistic type (median, mode, etc.).</p>
<h5>width</h5>
<p>the width of the pixel neighborhood.</p>
<h5>height</h5>
<p>the height of the pixel neighborhood.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/effect_8c.html" id="UnsharpMaskImage">UnsharpMaskImage</a></h2>
<div class="doc-section">
<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>
<p>The format of the UnsharpMaskImage method is:</p>
<pre class="code">
Image *UnsharpMaskImage(const Image *image,const double radius,
const double sigma,const double amount,const double threshold,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>radius</h5>
<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
<h5>sigma</h5>
<p>the standard deviation of the Gaussian, in pixels.</p>
<h5>amount</h5>
<p>the percentage of the difference between the original and the blur image that is added back into the original.</p>
<h5>threshold</h5>
<p>the threshold in pixels needed to apply the diffence amount.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
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