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12 <title>ImageMagick: MagickCore, C API for ImageMagick: Add a Special Effect</title>
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152 <p class="navigation-index">[<a href="#AddNoiseImage">AddNoiseImage</a> • <a href="#BlueShiftImage">BlueShiftImage</a> • <a href="#CharcoalImage">CharcoalImage</a> • <a href="#ColorizeImage">ColorizeImage</a> • <a href="#ColorMatrixImage">ColorMatrixImage</a> • <a href="#FxImage">FxImage</a> • <a href="#ImplodeImage">ImplodeImage</a> • <a href="#The MorphImages">The MorphImages</a> • <a href="#PlasmaImage">PlasmaImage</a> • <a href="#PolaroidImage">PolaroidImage</a> • <a href="#MagickSepiaToneImage">MagickSepiaToneImage</a> • <a href="#ShadowImage">ShadowImage</a> • <a href="#SketchImage">SketchImage</a> • <a href="#SolarizeImage">SolarizeImage</a> • <a href="#SteganoImage">SteganoImage</a> • <a href="#StereoAnaglyphImage">StereoAnaglyphImage</a> • <a href="#SwirlImage">SwirlImage</a> • <a href="#TintImage">TintImage</a> • <a href="#VignetteImage">VignetteImage</a> • <a href="#WaveImage">WaveImage</a>]</p>
154 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
155 _8c.html" target="source" name="AddNoiseImage">AddNoiseImage</a></h2>
156 <div class="doc-section">
158 <p>AddNoiseImage() adds random noise to the image.</p></ol>
160 <p>The format of the AddNoiseImage method is:</p>
163 Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
164 ExceptionInfo *exception)
165 Image *AddNoiseImageChannel(const Image *image,const ChannelType channel,
166 const NoiseType noise_type,ExceptionInfo *exception)
169 <p>A description of each parameter follows:</p></ol>
172 <ol><p>the image.</p></ol>
175 <ol><p>the channel type.</p></ol>
178 <ol><p>The type of noise: Uniform, Gaussian, Multiplicative, Impulse, Laplacian, or Poisson.</p></ol>
181 <ol><p>return any errors or warnings in this structure.</p></ol>
184 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
185 _8c.html" target="source" name="BlueShiftImage">BlueShiftImage</a></h2>
186 <div class="doc-section">
188 <p>BlueShiftImage() mutes the colors of the image to simulate a scene at nighttime in the moonlight.</p></ol>
190 <p>The format of the BlueShiftImage method is:</p>
193 Image *BlueShiftImage(const Image *image,const double factor,
194 ExceptionInfo *exception)
197 <p>A description of each parameter follows:</p></ol>
200 <ol><p>the image.</p></ol>
203 <ol><p>the shift factor.</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/fx
210 _8c.html" target="source" name="CharcoalImage">CharcoalImage</a></h2>
211 <div class="doc-section">
213 <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></ol>
215 <p>The format of the CharcoalImage method is:</p>
218 Image *CharcoalImage(const Image *image,const double radius,
219 const double sigma,ExceptionInfo *exception)
222 <p>A description of each parameter follows:</p></ol>
225 <ol><p>the image.</p></ol>
228 <ol><p>the radius of the pixel neighborhood.</p></ol>
231 <ol><p>the standard deviation of the Gaussian, 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/fx
238 _8c.html" target="source" name="ColorizeImage">ColorizeImage</a></h2>
239 <div class="doc-section">
241 <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></ol>
243 <p>The format of the ColorizeImage method is:</p>
246 Image *ColorizeImage(const Image *image,const char *opacity,
247 const PixelPacket colorize,ExceptionInfo *exception)
250 <p>A description of each parameter follows:</p></ol>
253 <ol><p>the image.</p></ol>
256 <ol><p>A character string indicating the level of opacity as a percentage.</p></ol>
259 <ol><p>A color value.</p></ol>
262 <ol><p>return any errors or warnings in this structure.</p></ol>
265 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
266 _8c.html" target="source" name="ColorMatrixImage">ColorMatrixImage</a></h2>
267 <div class="doc-section">
269 <p>ColorMatrixImage() applies color transformation to an image. This method permits saturation changes, hue rotation, luminance to alpha, and various other effects. Although variable-sized transformation matrices can be used, typically one uses a 5x5 matrix for an RGBA image and a 6x6 for CMYKA (or RGBA with offsets). The matrix is similar to those used by Adobe Flash except offsets are in column 6 rather than 5 (in support of CMYKA images) and offsets are normalized (divide Flash offset by 255).</p></ol>
271 <p>The format of the ColorMatrixImage method is:</p>
274 Image *ColorMatrixImage(const Image *image,
275 const KernelInfo *color_matrix,ExceptionInfo *exception)
278 <p>A description of each parameter follows:</p></ol>
281 <ol><p>the image.</p></ol>
283 <h5>color_matrix</h5>
284 <ol><p>the color matrix.</p></ol>
287 <ol><p>return any errors or warnings in this structure.</p></ol>
290 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
291 _8c.html" target="source" name="FxImage">FxImage</a></h2>
292 <div class="doc-section">
294 <p>FxImage() applies a mathematical expression to the specified image.</p></ol>
296 <p>The format of the FxImage method is:</p>
299 Image *FxImage(const Image *image,const char *expression,
300 ExceptionInfo *exception)
301 Image *FxImageChannel(const Image *image,const ChannelType channel,
302 const char *expression,ExceptionInfo *exception)
305 <p>A description of each parameter follows:</p></ol>
308 <ol><p>the image.</p></ol>
311 <ol><p>the channel.</p></ol>
314 <ol><p>A mathematical expression.</p></ol>
317 <ol><p>return any errors or warnings in this structure.</p></ol>
320 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
321 _8c.html" target="source" name="ImplodeImage">ImplodeImage</a></h2>
322 <div class="doc-section">
324 <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></ol>
326 <p>The format of the ImplodeImage method is:</p>
329 Image *ImplodeImage(const Image *image,const double amount,
330 ExceptionInfo *exception)
333 <p>A description of each parameter follows:</p></ol>
335 <h5>implode_image</h5>
336 <ol><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></ol>
339 <ol><p>the image.</p></ol>
342 <ol><p>Define the extent of the implosion.</p></ol>
345 <ol><p>return any errors or warnings in this structure.</p></ol>
348 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
349 _8c.html" target="source" name="The MorphImages">The MorphImages</a></h2>
350 <div class="doc-section">
352 <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></ol>
354 <p>The format of the MorphImage method is:</p>
357 Image *MorphImages(const Image *image,const size_t number_frames,
358 ExceptionInfo *exception)
361 <p>A description of each parameter follows:</p></ol>
364 <ol><p>the image.</p></ol>
366 <h5>number_frames</h5>
367 <ol><p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p></ol>
370 <ol><p>return any errors or warnings in this structure.</p></ol>
373 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
374 _8c.html" target="source" name="PlasmaImage">PlasmaImage</a></h2>
375 <div class="doc-section">
377 <p>PlasmaImage() initializes an image with plasma fractal values. The image must be initialized with a base color and the random number generator seeded before this method is called.</p></ol>
379 <p>The format of the PlasmaImage method is:</p>
382 MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
383 size_t attenuate,size_t depth)
386 <p>A description of each parameter follows:</p></ol>
389 <ol><p>the image.</p></ol>
392 <ol><p> Define the region to apply plasma fractals values.</p></ol>
395 <ol><p>Define the plasmattenuation factor.</p></ol>
398 <ol><p>Limit the plasma recursion depth.</p></ol>
401 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
402 _8c.html" target="source" name="PolaroidImage">PolaroidImage</a></h2>
403 <div class="doc-section">
405 <p>PolaroidImage() simulates a Polaroid picture.</p></ol>
407 <p>The format of the AnnotateImage method is:</p>
410 Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
411 const double angle,ExceptionInfo exception)
414 <p>A description of each parameter follows:</p></ol>
417 <ol><p>the image.</p></ol>
420 <ol><p>the draw info.</p></ol>
423 <ol><p>Apply the effect along this angle.</p></ol>
426 <ol><p>return any errors or warnings in this structure.</p></ol>
429 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
430 _8c.html" target="source" name="MagickSepiaToneImage">MagickSepiaToneImage</a></h2>
431 <div class="doc-section">
433 <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></ol>
435 <p>The format of the SepiaToneImage method is:</p>
438 Image *SepiaToneImage(const Image *image,const double threshold,
439 ExceptionInfo *exception)
442 <p>A description of each parameter follows:</p></ol>
445 <ol><p>the image.</p></ol>
448 <ol><p>the tone threshold.</p></ol>
451 <ol><p>return any errors or warnings in this structure.</p></ol>
454 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
455 _8c.html" target="source" name="ShadowImage">ShadowImage</a></h2>
456 <div class="doc-section">
458 <p>ShadowImage() simulates a shadow from the specified image and returns it.</p></ol>
460 <p>The format of the ShadowImage method is:</p>
463 Image *ShadowImage(const Image *image,const double opacity,
464 const double sigma,const ssize_t x_offset,const ssize_t y_offset,
465 ExceptionInfo *exception)
468 <p>A description of each parameter follows:</p></ol>
471 <ol><p>the image.</p></ol>
474 <ol><p>percentage transparency.</p></ol>
477 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
480 <ol><p>the shadow x-offset.</p></ol>
483 <ol><p>the shadow y-offset.</p></ol>
486 <ol><p>return any errors or warnings in this structure.</p></ol>
489 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
490 _8c.html" target="source" name="SketchImage">SketchImage</a></h2>
491 <div class="doc-section">
493 <p>SketchImage() simulates a pencil sketch. 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 SketchImage() selects a suitable radius for you. Angle gives the angle of the sketch.</p></ol>
495 <p>The format of the SketchImage method is:</p>
498 Image *SketchImage(const Image *image,const double radius,
499 const double sigma,const double angle,ExceptionInfo *exception)
502 <p>A description of each parameter follows:</p></ol>
505 <ol><p>the image.</p></ol>
508 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
511 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
514 <ol><p>Apply the effect along this angle.</p></ol>
517 <ol><p>return any errors or warnings in this structure.</p></ol>
520 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
521 _8c.html" target="source" name="SolarizeImage">SolarizeImage</a></h2>
522 <div class="doc-section">
524 <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></ol>
526 <p>The format of the SolarizeImage method is:</p>
529 MagickBooleanType SolarizeImage(Image *image,const double threshold)
532 <p>A description of each parameter follows:</p></ol>
535 <ol><p>the image.</p></ol>
538 <ol><p>Define the extent of the solarization.</p></ol>
541 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
542 _8c.html" target="source" name="SteganoImage">SteganoImage</a></h2>
543 <div class="doc-section">
545 <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></ol>
547 <p>The format of the SteganoImage method is:</p>
550 Image *SteganoImage(const Image *image,Image *watermark,
551 ExceptionInfo *exception)
554 <p>A description of each parameter follows:</p></ol>
557 <ol><p>the image.</p></ol>
560 <ol><p>the watermark image.</p></ol>
563 <ol><p>return any errors or warnings in this structure.</p></ol>
566 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
567 _8c.html" target="source" name="StereoAnaglyphImage">StereoAnaglyphImage</a></h2>
568 <div class="doc-section">
570 <p>StereoAnaglyphImage() 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></ol>
572 <p>The format of the StereoAnaglyphImage method is:</p>
575 Image *StereoImage(const Image *left_image,const Image *right_image,
576 ExceptionInfo *exception)
577 Image *StereoAnaglyphImage(const Image *left_image,
578 const Image *right_image,const ssize_t x_offset,const ssize_t y_offset,
579 ExceptionInfo *exception)
582 <p>A description of each parameter follows:</p></ol>
585 <ol><p>the left image.</p></ol>
588 <ol><p>the right image.</p></ol>
591 <ol><p>return any errors or warnings in this structure.</p></ol>
594 <ol><p>amount, in pixels, by which the left image is offset to the right of the right image.</p></ol>
597 <ol><p>amount, in pixels, by which the left image is offset to the bottom of the right image.</p></ol>
601 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
602 _8c.html" target="source" name="SwirlImage">SwirlImage</a></h2>
603 <div class="doc-section">
605 <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></ol>
607 <p>The format of the SwirlImage method is:</p>
610 Image *SwirlImage(const Image *image,double degrees,
611 ExceptionInfo *exception)
614 <p>A description of each parameter follows:</p></ol>
617 <ol><p>the image.</p></ol>
620 <ol><p>Define the tightness of the swirling effect.</p></ol>
623 <ol><p>return any errors or warnings in this structure.</p></ol>
626 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
627 _8c.html" target="source" name="TintImage">TintImage</a></h2>
628 <div class="doc-section">
630 <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></ol>
632 <p>The format of the TintImage method is:</p>
635 Image *TintImage(const Image *image,const char *opacity,
636 const PixelPacket tint,ExceptionInfo *exception)
639 <p>A description of each parameter follows:</p></ol>
642 <ol><p>the image.</p></ol>
645 <ol><p>A color value used for tinting.</p></ol>
648 <ol><p>A color value used for tinting.</p></ol>
651 <ol><p>return any errors or warnings in this structure.</p></ol>
654 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
655 _8c.html" target="source" name="VignetteImage">VignetteImage</a></h2>
656 <div class="doc-section">
658 <p>VignetteImage() softens the edges of the image in vignette style.</p></ol>
660 <p>The format of the VignetteImage method is:</p>
663 Image *VignetteImage(const Image *image,const double radius,
664 const double sigma,const ssize_t x,const ssize_t y,ExceptionInfo *exception)
667 <p>A description of each parameter follows:</p></ol>
670 <ol><p>the image.</p></ol>
673 <ol><p>the radius of the pixel neighborhood.</p></ol>
676 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
679 <ol><p>Define the x and y ellipse offset.</p></ol>
682 <ol><p>return any errors or warnings in this structure.</p></ol>
685 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
686 _8c.html" target="source" name="WaveImage">WaveImage</a></h2>
687 <div class="doc-section">
689 <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></ol>
691 <p>The format of the WaveImage method is:</p>
694 Image *WaveImage(const Image *image,const double amplitude,
695 const double wave_length,ExceptionInfo *exception)
698 <p>A description of each parameter follows:</p></ol>
701 <ol><p>the image.</p></ol>
703 <h5>amplitude, wave_length</h5>
704 <ol><p>Define the amplitude and wave length of the sine wave.</p></ol>
707 <ol><p>return any errors or warnings in this structure.</p></ol>
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