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202 <h1>Module fx Methods</h1>
203 <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>
205 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="AddNoiseImage">AddNoiseImage</a></h2>
206 <div class="doc-section">
208 <p>AddNoiseImage() adds random noise to the image.</p>
210 <p>The format of the AddNoiseImage method is:</p>
213 Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
214 ExceptionInfo *exception)
215 Image *AddNoiseImageChannel(const Image *image,const ChannelType channel,
216 const NoiseType noise_type,ExceptionInfo *exception)
219 <p>A description of each parameter follows:</p>
225 <p>the channel type.</p>
228 <p>The type of noise: Uniform, Gaussian, Multiplicative, Impulse, Laplacian, or Poisson.</p>
231 <p>return any errors or warnings in this structure.</p>
234 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="BlueShiftImage">BlueShiftImage</a></h2>
235 <div class="doc-section">
237 <p>BlueShiftImage() mutes the colors of the image to simulate a scene at nighttime in the moonlight.</p>
239 <p>The format of the BlueShiftImage method is:</p>
242 Image *BlueShiftImage(const Image *image,const double factor,
243 ExceptionInfo *exception)
246 <p>A description of each parameter follows:</p>
252 <p>the shift factor.</p>
255 <p>return any errors or warnings in this structure.</p>
258 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="CharcoalImage">CharcoalImage</a></h2>
259 <div class="doc-section">
261 <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>
263 <p>The format of the CharcoalImage method is:</p>
266 Image *CharcoalImage(const Image *image,const double radius,
267 const double sigma,ExceptionInfo *exception)
270 <p>A description of each parameter follows:</p>
276 <p>the radius of the pixel neighborhood.</p>
279 <p>the standard deviation of the Gaussian, in pixels.</p>
282 <p>return any errors or warnings in this structure.</p>
285 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorizeImage">ColorizeImage</a></h2>
286 <div class="doc-section">
288 <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>
290 <p>The format of the ColorizeImage method is:</p>
293 Image *ColorizeImage(const Image *image,const char *opacity,
294 const PixelPacket colorize,ExceptionInfo *exception)
297 <p>A description of each parameter follows:</p>
303 <p>A character string indicating the level of opacity as a percentage.</p>
306 <p>A color value.</p>
309 <p>return any errors or warnings in this structure.</p>
312 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorMatrixImage">ColorMatrixImage</a></h2>
313 <div class="doc-section">
315 <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>
317 <p>The format of the ColorMatrixImage method is:</p>
320 Image *ColorMatrixImage(const Image *image,
321 const KernelInfo *color_matrix,ExceptionInfo *exception)
324 <p>A description of each parameter follows:</p>
329 <h5>color_matrix</h5>
330 <p>the color matrix.</p>
333 <p>return any errors or warnings in this structure.</p>
336 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="FxImage">FxImage</a></h2>
337 <div class="doc-section">
339 <p>FxImage() applies a mathematical expression to the specified image.</p>
341 <p>The format of the FxImage method is:</p>
344 Image *FxImage(const Image *image,const char *expression,
345 ExceptionInfo *exception)
346 Image *FxImageChannel(const Image *image,const ChannelType channel,
347 const char *expression,ExceptionInfo *exception)
350 <p>A description of each parameter follows:</p>
359 <p>A mathematical expression.</p>
362 <p>return any errors or warnings in this structure.</p>
365 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ImplodeImage">ImplodeImage</a></h2>
366 <div class="doc-section">
368 <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>
370 <p>The format of the ImplodeImage method is:</p>
373 Image *ImplodeImage(const Image *image,const double amount,
374 ExceptionInfo *exception)
377 <p>A description of each parameter follows:</p>
379 <h5>implode_image</h5>
380 <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>
386 <p>Define the extent of the implosion.</p>
389 <p>return any errors or warnings in this structure.</p>
392 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="The_MorphImages">The MorphImages</a></h2>
393 <div class="doc-section">
395 <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>
397 <p>The format of the MorphImage method is:</p>
400 Image *MorphImages(const Image *image,const size_t number_frames,
401 ExceptionInfo *exception)
404 <p>A description of each parameter follows:</p>
409 <h5>number_frames</h5>
410 <p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p>
413 <p>return any errors or warnings in this structure.</p>
416 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PlasmaImage">PlasmaImage</a></h2>
417 <div class="doc-section">
419 <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>
421 <p>The format of the PlasmaImage method is:</p>
424 MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
425 size_t attenuate,size_t depth)
428 <p>A description of each parameter follows:</p>
434 <p> Define the region to apply plasma fractals values.</p>
437 <p>Define the plasma attenuation factor.</p>
440 <p>Limit the plasma recursion depth.</p>
443 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PolaroidImage">PolaroidImage</a></h2>
444 <div class="doc-section">
446 <p>PolaroidImage() simulates a Polaroid picture.</p>
448 <p>The format of the AnnotateImage method is:</p>
451 Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
452 const double angle,ExceptionInfo exception)
455 <p>A description of each parameter follows:</p>
461 <p>the draw info.</p>
464 <p>Apply the effect along this angle.</p>
467 <p>return any errors or warnings in this structure.</p>
470 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="MagickSepiaToneImage">MagickSepiaToneImage</a></h2>
471 <div class="doc-section">
473 <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>
475 <p>The format of the SepiaToneImage method is:</p>
478 Image *SepiaToneImage(const Image *image,const double threshold,
479 ExceptionInfo *exception)
482 <p>A description of each parameter follows:</p>
488 <p>the tone threshold.</p>
491 <p>return any errors or warnings in this structure.</p>
494 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ShadowImage">ShadowImage</a></h2>
495 <div class="doc-section">
497 <p>ShadowImage() simulates a shadow from the specified image and returns it.</p>
499 <p>The format of the ShadowImage method is:</p>
502 Image *ShadowImage(const Image *image,const double opacity,
503 const double sigma,const ssize_t x_offset,const ssize_t y_offset,
504 ExceptionInfo *exception)
507 <p>A description of each parameter follows:</p>
513 <p>percentage transparency.</p>
516 <p>the standard deviation of the Gaussian, in pixels.</p>
519 <p>the shadow x-offset.</p>
522 <p>the shadow y-offset.</p>
525 <p>return any errors or warnings in this structure.</p>
528 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SketchImage">SketchImage</a></h2>
529 <div class="doc-section">
531 <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>
533 <p>The format of the SketchImage method is:</p>
536 Image *SketchImage(const Image *image,const double radius,
537 const double sigma,const double angle,ExceptionInfo *exception)
540 <p>A description of each parameter follows:</p>
546 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
549 <p>the standard deviation of the Gaussian, in pixels.</p>
552 <p>Apply the effect along this angle.</p>
555 <p>return any errors or warnings in this structure.</p>
558 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SolarizeImage">SolarizeImage</a></h2>
559 <div class="doc-section">
561 <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>
563 <p>The format of the SolarizeImage method is:</p>
566 MagickBooleanType SolarizeImage(Image *image,const double threshold)
569 <p>A description of each parameter follows:</p>
575 <p>Define the extent of the solarization.</p>
578 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SteganoImage">SteganoImage</a></h2>
579 <div class="doc-section">
581 <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>
583 <p>The format of the SteganoImage method is:</p>
586 Image *SteganoImage(const Image *image,Image *watermark,
587 ExceptionInfo *exception)
590 <p>A description of each parameter follows:</p>
596 <p>the watermark image.</p>
599 <p>return any errors or warnings in this structure.</p>
602 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="StereoAnaglyphImage">StereoAnaglyphImage</a></h2>
603 <div class="doc-section">
605 <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>
607 <p>The format of the StereoAnaglyphImage method is:</p>
610 Image *StereoImage(const Image *left_image,const Image *right_image,
611 ExceptionInfo *exception)
612 Image *StereoAnaglyphImage(const Image *left_image,
613 const Image *right_image,const ssize_t x_offset,const ssize_t y_offset,
614 ExceptionInfo *exception)
617 <p>A description of each parameter follows:</p>
620 <p>the left image.</p>
623 <p>the right image.</p>
626 <p>return any errors or warnings in this structure.</p>
629 <p>amount, in pixels, by which the left image is offset to the right of the right image.</p>
632 <p>amount, in pixels, by which the left image is offset to the bottom of the right image.</p>
636 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SwirlImage">SwirlImage</a></h2>
637 <div class="doc-section">
639 <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>
641 <p>The format of the SwirlImage method is:</p>
644 Image *SwirlImage(const Image *image,double degrees,
645 ExceptionInfo *exception)
648 <p>A description of each parameter follows:</p>
654 <p>Define the tightness of the swirling effect.</p>
657 <p>return any errors or warnings in this structure.</p>
660 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="TintImage">TintImage</a></h2>
661 <div class="doc-section">
663 <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>
665 <p>The format of the TintImage method is:</p>
668 Image *TintImage(const Image *image,const char *opacity,
669 const PixelPacket tint,ExceptionInfo *exception)
672 <p>A description of each parameter follows:</p>
678 <p>A color value used for tinting.</p>
681 <p>A color value used for tinting.</p>
684 <p>return any errors or warnings in this structure.</p>
687 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="VignetteImage">VignetteImage</a></h2>
688 <div class="doc-section">
690 <p>VignetteImage() softens the edges of the image in vignette style.</p>
692 <p>The format of the VignetteImage method is:</p>
695 Image *VignetteImage(const Image *image,const double radius,
696 const double sigma,const ssize_t x,const ssize_t y,ExceptionInfo *exception)
699 <p>A description of each parameter follows:</p>
705 <p>the radius of the pixel neighborhood.</p>
708 <p>the standard deviation of the Gaussian, in pixels.</p>
711 <p>Define the x and y ellipse offset.</p>
714 <p>return any errors or warnings in this structure.</p>
717 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="WaveImage">WaveImage</a></h2>
718 <div class="doc-section">
720 <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>
722 <p>The format of the WaveImage method is:</p>
725 Image *WaveImage(const Image *image,const double amplitude,
726 const double wave_length,ExceptionInfo *exception)
729 <p>A description of each parameter follows:</p>
734 <h5>amplitude, wave_length</h5>
735 <p>Define the amplitude and wave length of the sine wave.</p>
738 <p>return any errors or warnings in this structure.</p>
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