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12 <title>ImageMagick: MagickCore, C API for ImageMagick: Add a Special Effect</title>
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155 <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="#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="#RecolorImage">RecolorImage</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>
157 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
158 _8c.html" target="source" name="AddNoiseImage">AddNoiseImage</a></h2>
159 <div class="doc-section">
161 <p>AddNoiseImage() adds random noise to the image.</p></ol>
163 <p>The format of the AddNoiseImage method is:</p>
166 Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
167 ExceptionInfo *exception)
168 Image *AddNoiseImageChannel(const Image *image,const ChannelType channel,
169 const NoiseType noise_type,ExceptionInfo *exception)
172 <p>A description of each parameter follows:</p></ol>
175 <ol><p>the image.</p></ol>
178 <ol><p>the channel type.</p></ol>
181 <ol><p>The type of noise: Uniform, Gaussian, Multiplicative, Impulse, Laplacian, or Poisson.</p></ol>
184 <ol><p>return any errors or warnings in this structure.</p></ol>
187 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
188 _8c.html" target="source" name="BlueShiftImage">BlueShiftImage</a></h2>
189 <div class="doc-section">
191 <p>BlueShiftImage() mutes the colors of the image to simulate a scene at nighttime in the moonlight.</p></ol>
193 <p>The format of the BlueShiftImage method is:</p>
196 Image *BlueShiftImage(const Image *image,const double factor,
197 ExceptionInfo *exception)
200 <p>A description of each parameter follows:</p></ol>
203 <ol><p>the image.</p></ol>
206 <ol><p>the shift factor.</p></ol>
209 <ol><p>return any errors or warnings in this structure.</p></ol>
212 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
213 _8c.html" target="source" name="CharcoalImage">CharcoalImage</a></h2>
214 <div class="doc-section">
216 <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>
218 <p>The format of the CharcoalImage method is:</p>
221 Image *CharcoalImage(const Image *image,const double radius,
222 const double sigma,ExceptionInfo *exception)
225 <p>A description of each parameter follows:</p></ol>
228 <ol><p>the image.</p></ol>
231 <ol><p>the radius of the pixel neighborhood.</p></ol>
234 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
237 <ol><p>return any errors or warnings in this structure.</p></ol>
240 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
241 _8c.html" target="source" name="ColorizeImage">ColorizeImage</a></h2>
242 <div class="doc-section">
244 <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>
246 <p>The format of the ColorizeImage method is:</p>
249 Image *ColorizeImage(const Image *image,const char *opacity,
250 const PixelPacket colorize,ExceptionInfo *exception)
253 <p>A description of each parameter follows:</p></ol>
256 <ol><p>the image.</p></ol>
259 <ol><p>A character string indicating the level of opacity as a percentage.</p></ol>
262 <ol><p>A color value.</p></ol>
265 <ol><p>return any errors or warnings in this structure.</p></ol>
268 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
269 _8c.html" target="source" name="FxImage">FxImage</a></h2>
270 <div class="doc-section">
272 <p>FxImage() applies a mathematical expression to the specified image.</p></ol>
274 <p>The format of the FxImage method is:</p>
277 Image *FxImage(const Image *image,const char *expression,
278 ExceptionInfo *exception)
279 Image *FxImageChannel(const Image *image,const ChannelType channel,
280 const char *expression,ExceptionInfo *exception)
283 <p>A description of each parameter follows:</p></ol>
286 <ol><p>the image.</p></ol>
289 <ol><p>the channel.</p></ol>
292 <ol><p>A mathematical expression.</p></ol>
295 <ol><p>return any errors or warnings in this structure.</p></ol>
298 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
299 _8c.html" target="source" name="ImplodeImage">ImplodeImage</a></h2>
300 <div class="doc-section">
302 <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>
304 <p>The format of the ImplodeImage method is:</p>
307 Image *ImplodeImage(const Image *image,const double amount,
308 ExceptionInfo *exception)
311 <p>A description of each parameter follows:</p></ol>
313 <h5>implode_image</h5>
314 <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>
317 <ol><p>the image.</p></ol>
320 <ol><p>Define the extent of the implosion.</p></ol>
323 <ol><p>return any errors or warnings in this structure.</p></ol>
326 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
327 _8c.html" target="source" name="The MorphImages">The MorphImages</a></h2>
328 <div class="doc-section">
330 <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>
332 <p>The format of the MorphImage method is:</p>
335 Image *MorphImages(const Image *image,const unsigned long number_frames,
336 ExceptionInfo *exception)
339 <p>A description of each parameter follows:</p></ol>
342 <ol><p>the image.</p></ol>
344 <h5>number_frames</h5>
345 <ol><p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p></ol>
348 <ol><p>return any errors or warnings in this structure.</p></ol>
351 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
352 _8c.html" target="source" name="PlasmaImage">PlasmaImage</a></h2>
353 <div class="doc-section">
355 <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>
357 <p>The format of the PlasmaImage method is:</p>
360 MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
361 unsigned long attenuate,unsigned long depth)
364 <p>A description of each parameter follows:</p></ol>
367 <ol><p>the image.</p></ol>
370 <ol><p> Define the region to apply plasma fractals values.</p></ol>
373 <ol><p>Define the plasmattenuation factor.</p></ol>
376 <ol><p>Limit the plasma recursion depth.</p></ol>
379 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
380 _8c.html" target="source" name="PolaroidImage">PolaroidImage</a></h2>
381 <div class="doc-section">
383 <p>PolaroidImage() simulates a Polaroid picture.</p></ol>
385 <p>The format of the AnnotateImage method is:</p>
388 Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
389 const double angle,ExceptionInfo exception)
392 <p>A description of each parameter follows:</p></ol>
395 <ol><p>the image.</p></ol>
398 <ol><p>the draw info.</p></ol>
401 <ol><p>Apply the effect along this angle.</p></ol>
404 <ol><p>return any errors or warnings in this structure.</p></ol>
407 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
408 _8c.html" target="source" name="RecolorImage">RecolorImage</a></h2>
409 <div class="doc-section">
411 <p>RecolorImage() translate, scale, shear, or rotate image colors. Although you can use variable sized matrices, typically you use a 5 x 5 for an RGBA image and a 6x6 for CMYKA. Populate the last row with normalized values to translate.</p></ol>
413 <p>The format of the RecolorImage method is:</p>
416 Image *RecolorImage(const Image *image,const unsigned long order,
417 const double *color_matrix,ExceptionInfo *exception)
420 <p>A description of each parameter follows:</p></ol>
423 <ol><p>the image.</p></ol>
426 <ol><p>the number of columns and rows in the recolor matrix.</p></ol>
428 <h5>color_matrix</h5>
429 <ol><p>An array of double representing the recolor matrix.</p></ol>
432 <ol><p>return any errors or warnings in this structure.</p></ol>
435 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
436 _8c.html" target="source" name="MagickSepiaToneImage">MagickSepiaToneImage</a></h2>
437 <div class="doc-section">
439 <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>
441 <p>The format of the SepiaToneImage method is:</p>
444 Image *SepiaToneImage(const Image *image,const double threshold,
445 ExceptionInfo *exception)
448 <p>A description of each parameter follows:</p></ol>
451 <ol><p>the image.</p></ol>
454 <ol><p>the tone threshold.</p></ol>
457 <ol><p>return any errors or warnings in this structure.</p></ol>
460 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
461 _8c.html" target="source" name="ShadowImage">ShadowImage</a></h2>
462 <div class="doc-section">
464 <p>ShadowImage() simulates a shadow from the specified image and returns it.</p></ol>
466 <p>The format of the ShadowImage method is:</p>
469 Image *ShadowImage(const Image *image,const double opacity,
470 const double sigma,const long x_offset,const long y_offset,
471 ExceptionInfo *exception)
474 <p>A description of each parameter follows:</p></ol>
477 <ol><p>the image.</p></ol>
480 <ol><p>percentage transparency.</p></ol>
483 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
486 <ol><p>the shadow x-offset.</p></ol>
489 <ol><p>the shadow y-offset.</p></ol>
492 <ol><p>return any errors or warnings in this structure.</p></ol>
495 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
496 _8c.html" target="source" name="SketchImage">SketchImage</a></h2>
497 <div class="doc-section">
499 <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>
501 <p>The format of the SketchImage method is:</p>
504 Image *SketchImage(const Image *image,const double radius,
505 const double sigma,const double angle,ExceptionInfo *exception)
508 <p>A description of each parameter follows:</p></ol>
511 <ol><p>the image.</p></ol>
514 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
517 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
520 <ol><p>Apply the effect along this angle.</p></ol>
523 <ol><p>return any errors or warnings in this structure.</p></ol>
526 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
527 _8c.html" target="source" name="SolarizeImage">SolarizeImage</a></h2>
528 <div class="doc-section">
530 <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>
532 <p>The format of the SolarizeImage method is:</p>
535 MagickBooleanType SolarizeImage(Image *image,const double threshold)
538 <p>A description of each parameter follows:</p></ol>
541 <ol><p>the image.</p></ol>
544 <ol><p>Define the extent of the solarization.</p></ol>
547 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
548 _8c.html" target="source" name="SteganoImage">SteganoImage</a></h2>
549 <div class="doc-section">
551 <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>
553 <p>The format of the SteganoImage method is:</p>
556 Image *SteganoImage(const Image *image,Image *watermark,
557 ExceptionInfo *exception)
560 <p>A description of each parameter follows:</p></ol>
563 <ol><p>the image.</p></ol>
566 <ol><p>the watermark image.</p></ol>
569 <ol><p>return any errors or warnings in this structure.</p></ol>
572 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
573 _8c.html" target="source" name="StereoAnaglyphImage">StereoAnaglyphImage</a></h2>
574 <div class="doc-section">
576 <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>
578 <p>The format of the StereoAnaglyphImage method is:</p>
581 Image *StereoImage(const Image *left_image,const Image *right_image,
582 ExceptionInfo *exception)
583 Image *StereoAnaglyphImage(const Image *left_image,
584 const Image *right_image,const long x_offset,const long y_offset,
585 ExceptionInfo *exception)
588 <p>A description of each parameter follows:</p></ol>
591 <ol><p>the left image.</p></ol>
594 <ol><p>the right image.</p></ol>
597 <ol><p>return any errors or warnings in this structure.</p></ol>
600 <ol><p>amount, in pixels, by which the left image is offset to the right of the right image.</p></ol>
603 <ol><p>amount, in pixels, by which the left image is offset to the bottom of the right image.</p></ol>
607 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
608 _8c.html" target="source" name="SwirlImage">SwirlImage</a></h2>
609 <div class="doc-section">
611 <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>
613 <p>The format of the SwirlImage method is:</p>
616 Image *SwirlImage(const Image *image,double degrees,
617 ExceptionInfo *exception)
620 <p>A description of each parameter follows:</p></ol>
623 <ol><p>the image.</p></ol>
626 <ol><p>Define the tightness of the swirling effect.</p></ol>
629 <ol><p>return any errors or warnings in this structure.</p></ol>
632 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
633 _8c.html" target="source" name="TintImage">TintImage</a></h2>
634 <div class="doc-section">
636 <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>
638 <p>The format of the TintImage method is:</p>
641 Image *TintImage(const Image *image,const char *opacity,
642 const PixelPacket tint,ExceptionInfo *exception)
645 <p>A description of each parameter follows:</p></ol>
648 <ol><p>the image.</p></ol>
651 <ol><p>A color value used for tinting.</p></ol>
654 <ol><p>A color value used for tinting.</p></ol>
657 <ol><p>return any errors or warnings in this structure.</p></ol>
660 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
661 _8c.html" target="source" name="VignetteImage">VignetteImage</a></h2>
662 <div class="doc-section">
664 <p>VignetteImage() softens the edges of the image in vignette style.</p></ol>
666 <p>The format of the VignetteImage method is:</p>
669 Image *VignetteImage(const Image *image,const double radius,
670 const double sigma,const long x,const long y,ExceptionInfo *exception)
673 <p>A description of each parameter follows:</p></ol>
676 <ol><p>the image.</p></ol>
679 <ol><p>the radius of the pixel neighborhood.</p></ol>
682 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
685 <ol><p>Define the x and y ellipse offset.</p></ol>
688 <ol><p>return any errors or warnings in this structure.</p></ol>
691 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
692 _8c.html" target="source" name="WaveImage">WaveImage</a></h2>
693 <div class="doc-section">
695 <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>
697 <p>The format of the WaveImage method is:</p>
700 Image *WaveImage(const Image *image,const double amplitude,
701 const double wave_length,ExceptionInfo *exception)
704 <p>A description of each parameter follows:</p></ol>
707 <ol><p>the image.</p></ol>
709 <h5>amplitude, wave_length</h5>
710 <ol><p>Define the amplitude and wave length of the sine wave.</p></ol>
713 <ol><p>return any errors or warnings in this structure.</p></ol>
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