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<title>ImageMagick: MagickCore, C API for ImageMagick: Add a Special Effect</title>
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<p class="navigation-index">[ <a href="#CharcoalImage">CharcoalImage</a> | <a href="#ColorizeImage">ColorizeImage</a> | <a href="#ConvolveImageChannel">ConvolveImageChannel</a> | <a href="#EvaluateImageChannel">EvaluateImageChannel</a> | <a href="#FxImageChannel">FxImageChannel</a> | <a href="#ImplodeImage">ImplodeImage</a> | <a href="#The MorphImages">The MorphImages</a> | <a href="#OilPaintImage">OilPaintImage</a> | <a href="#MagickSepiaToneImage">MagickSepiaToneImage</a> | <a href="#ShadowImage">ShadowImage</a> | <a href="#SolarizeImage">SolarizeImage</a> | <a href="#SteganoImage">SteganoImage</a> | <a href="#StereoImage">StereoImage</a> | <a href="#SwirlImage">SwirlImage</a> | <a href="#TintImage">TintImage</a> | <a href="#WaveImage">WaveImage</a> ]</p>
<div style="margin: auto;">
<h2><a name="CharcoalImage">CharcoalImage</a></h2>
</div>
<p>CharcoalImage() creates a new image that is a copy of an existing one with the edge highlighted. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p>
<p>The format of the CharcoalImage method is:</p>
<pre class="code">
Image *CharcoalImage(const Image *image,const double radius,
const double sigma,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>radius</h4>
<p>the radius of the pixel neighborhood.</p>
<h4>sigma</h4>
<p>The standard deviation of the Gaussian, in pixels.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="ColorizeImage">ColorizeImage</a></h2>
</div>
<p>ColorizeImage() blends the fill color with each pixel in the image. A percentage blend is specified with opacity. Control the application of different color components by specifying a different percentage for each component (e.g. 90/100/10 is 90 red, 100 green, and 10 blue).</p>
<p>The format of the ColorizeImage method is:</p>
<pre class="code">
Image *ColorizeImage(const Image *image,const char *opacity,
const PixelPacket colorize,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>opacity</h4>
<p>A character string indicating the level of opacity as a percentage.</p>
<h4>colorize</h4>
<p>A color value.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="ConvolveImageChannel">ConvolveImageChannel</a></h2>
</div>
<p>ConvolveImageChannel() applies a custom convolution kernel to the image.</p>
<p>The format of the ConvolveImageChannel method is:</p>
<pre class="code">
Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
const unsigned long order,const double *kernel,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>channel</h4>
<p>The channel type.</p>
<h4>order</h4>
<p>The number of columns and rows in the filter kernel.</p>
<h4>kernel</h4>
<p>An array of double representing the convolution kernel.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="EvaluateImageChannel">EvaluateImageChannel</a></h2>
</div>
<p>EvaluateImageChannel() applies a value to the image with an arithmetic, relational, or logical operator to an image. Use these operations to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.</p>
<p>The format of the EvaluateImageChannel method is:</p>
<pre class="code">
MagickBooleanType EvaluateImageChannel(Image *image,
const ChannelType channel,const MagickEvaluateOperator op,
const double value,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>channel</h4>
<p>The channel.</p>
<h4>op</h4>
<p>A channel op.</p>
<h4>value</h4>
<p>A value value.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="FxImageChannel">FxImageChannel</a></h2>
</div>
<p>FxImageChannel() applies a mathematical expression to the specified image channel(s).</p>
<p>The format of the FxImageChannel method is:</p>
<pre class="code">
Image *FxImageChannel(const Image *image,const ChannelType channel,
const char *expression,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>channel</h4>
<p>The channel.</p>
<h4>expression</h4>
<p>A mathematical expression.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="ImplodeImage">ImplodeImage</a></h2>
</div>
<p>ImplodeImage() creates a new image that is a copy of an existing one with the image pixels "implode" by the specified percentage. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p>
<p>The format of the ImplodeImage method is:</p>
<pre class="code">
Image *ImplodeImage(const Image *image,const double amount,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>implode_image</h4>
<p>Method ImplodeImage returns a pointer to the image after it is implode. A null image is returned if there is a memory shortage.</p>
<h4>image</h4>
<p>The image.</p>
<h4>amount</h4>
<p>Define the extent of the implosion.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="The MorphImages">The MorphImages</a></h2>
</div>
<p>The MorphImages() method requires a minimum of two images. The first image is transformed into the second by a number of intervening images as specified by frames.</p>
<p>The format of the MorphImage method is:</p>
<pre class="code">
Image *MorphImages(const Image *image,const unsigned long number_frames,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>number_frames</h4>
<p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="OilPaintImage">OilPaintImage</a></h2>
</div>
<p>OilPaintImage() applies a special effect filter that simulates an oil painting. Each pixel is replaced by the most frequent color occurring in a circular region defined by radius.</p>
<p>The format of the OilPaintImage method is:</p>
<pre class="code">
Image *OilPaintImage(const Image *image,const double radius,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>radius</h4>
<p>The radius of the circular neighborhood.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="MagickSepiaToneImage">MagickSepiaToneImage</a></h2>
</div>
<p>MagickSepiaToneImage() applies a special effect to the image, similar to the effect achieved in a photo darkroom by sepia toning. Threshold ranges from 0 to QuantumRange and is a measure of the extent of the sepia toning. A threshold of 80 is a good starting point for a reasonable tone.</p>
<p>The format of the SepiaToneImage method is:</p>
<pre class="code">
Image *SepiaToneImage(const Image *image,const double threshold,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>threshold</h4>
<p>The tone threshold.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="ShadowImage">ShadowImage</a></h2>
</div>
<p>ShadowImage() simulates a shadow from the specified image and retuns it.</p>
<p>The format of the ShadowImage method is:</p>
<pre class="code">
Image *ShadowImage(const Image *image,const double opacity,
const double sigma,const long x_offset,const long y_offset,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>opacity</h4>
<p>percentage transparency.</p>
<h4>sigma</h4>
<p>The standard deviation of the Gaussian, in pixels.</p>
<h4>x_offset</h4>
<p>the shadow x-offset.</p>
<h4>y_offset</h4>
<p>the shadow y-offset.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="SolarizeImage">SolarizeImage</a></h2>
</div>
<p>SolarizeImage() applies a special effect to the image, similar to the effect achieved in a photo darkroom by selectively exposing areas of photo sensitive paper to light. Threshold ranges from 0 to QuantumRange and is a measure of the extent of the solarization.</p>
<p>The format of the SolarizeImage method is:</p>
<pre class="code">
MagickBooleanType SolarizeImage(Image *image,const double threshold)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>threshold</h4>
<p>Define the extent of the solarization.</p>
<div style="margin: auto;">
<h2><a name="SteganoImage">SteganoImage</a></h2>
</div>
<p>SteganoImage() hides a digital watermark within the image. Recover the hidden watermark later to prove that the authenticity of an image. Offset defines the start position within the image to hide the watermark.</p>
<p>The format of the SteganoImage method is:</p>
<pre class="code">
Image *SteganoImage(const Image *image,Image *watermark,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>watermark</h4>
<p>The watermark image.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="StereoImage">StereoImage</a></h2>
</div>
<p>StereoImage() combines two images and produces a single image that is the composite of a left and right image of a stereo pair. Special red-green stereo glasses are required to view this effect.</p>
<p>The format of the StereoImage method is:</p>
<pre class="code">
Image *StereoImage(const Image *image,const Image *offset_image,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>offset_image</h4>
<p>Another image.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="SwirlImage">SwirlImage</a></h2>
</div>
<p>SwirlImage() swirls the pixels about the center of the image, where degrees indicates the sweep of the arc through which each pixel is moved. You get a more dramatic effect as the degrees move from 1 to 360.</p>
<p>The format of the SwirlImage method is:</p>
<pre class="code">
Image *SwirlImage(const Image *image,double degrees,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>degrees</h4>
<p>Define the tightness of the swirling effect.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="TintImage">TintImage</a></h2>
</div>
<p>TintImage() applies a color vector to each pixel in the image. The length of the vector is 0 for black and white and at its maximum for the midtones. The vector weighting function is f(x)=(1-(4.0*((x-0.5)*(x-0.5))))</p>
<p>The format of the TintImage method is:</p>
<pre class="code">
Image *TintImage(const Image *image,const char *opacity,
const PixelPacket tint,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>opacity</h4>
<p>A color value used for tinting.</p>
<h4>tint</h4>
<p>A color value used for tinting.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="WaveImage">WaveImage</a></h2>
</div>
<p>WaveImage() creates a "ripple" effect in the image by shifting the pixels vertically along a sine wave whose amplitude and wavelength is specified by the given parameters.</p>
<p>The format of the WaveImage method is:</p>
<pre class="code">
Image *WaveImage(const Image *image,const double amplitude,
const double wave_length,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>amplitude, wave_length</h4>
<p>Define the amplitude and wave length of the sine wave.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
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