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199 <h1>Module fx Methods</h1>
200 <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>
202 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="AddNoiseImage">AddNoiseImage</a></h2>
203 <div class="doc-section">
205 <p>AddNoiseImage() adds random noise to the image.</p>
207 <p>The format of the AddNoiseImage method is:</p>
210 Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
211 ExceptionInfo *exception)
212 Image *AddNoiseImageChannel(const Image *image,const ChannelType channel,
213 const NoiseType noise_type,ExceptionInfo *exception)
216 <p>A description of each parameter follows:</p>
222 <p>the channel type.</p>
225 <p>The type of noise: Uniform, Gaussian, Multiplicative, Impulse, Laplacian, or Poisson.</p>
228 <p>return any errors or warnings in this structure.</p>
231 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="BlueShiftImage">BlueShiftImage</a></h2>
232 <div class="doc-section">
234 <p>BlueShiftImage() mutes the colors of the image to simulate a scene at nighttime in the moonlight.</p>
236 <p>The format of the BlueShiftImage method is:</p>
239 Image *BlueShiftImage(const Image *image,const double factor,
240 ExceptionInfo *exception)
243 <p>A description of each parameter follows:</p>
249 <p>the shift factor.</p>
252 <p>return any errors or warnings in this structure.</p>
255 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="CharcoalImage">CharcoalImage</a></h2>
256 <div class="doc-section">
258 <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>
260 <p>The format of the CharcoalImage method is:</p>
263 Image *CharcoalImage(const Image *image,const double radius,
264 const double sigma,ExceptionInfo *exception)
267 <p>A description of each parameter follows:</p>
273 <p>the radius of the pixel neighborhood.</p>
276 <p>the standard deviation of the Gaussian, in pixels.</p>
279 <p>return any errors or warnings in this structure.</p>
282 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorizeImage">ColorizeImage</a></h2>
283 <div class="doc-section">
285 <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>
287 <p>The format of the ColorizeImage method is:</p>
290 Image *ColorizeImage(const Image *image,const char *opacity,
291 const PixelPacket colorize,ExceptionInfo *exception)
294 <p>A description of each parameter follows:</p>
300 <p>A character string indicating the level of opacity as a percentage.</p>
303 <p>A color value.</p>
306 <p>return any errors or warnings in this structure.</p>
309 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorMatrixImage">ColorMatrixImage</a></h2>
310 <div class="doc-section">
312 <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>
314 <p>The format of the ColorMatrixImage method is:</p>
317 Image *ColorMatrixImage(const Image *image,
318 const KernelInfo *color_matrix,ExceptionInfo *exception)
321 <p>A description of each parameter follows:</p>
326 <h5>color_matrix</h5>
327 <p>the color matrix.</p>
330 <p>return any errors or warnings in this structure.</p>
333 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="FxImage">FxImage</a></h2>
334 <div class="doc-section">
336 <p>FxImage() applies a mathematical expression to the specified image.</p>
338 <p>The format of the FxImage method is:</p>
341 Image *FxImage(const Image *image,const char *expression,
342 ExceptionInfo *exception)
343 Image *FxImageChannel(const Image *image,const ChannelType channel,
344 const char *expression,ExceptionInfo *exception)
347 <p>A description of each parameter follows:</p>
356 <p>A mathematical expression.</p>
359 <p>return any errors or warnings in this structure.</p>
362 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ImplodeImage">ImplodeImage</a></h2>
363 <div class="doc-section">
365 <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>
367 <p>The format of the ImplodeImage method is:</p>
370 Image *ImplodeImage(const Image *image,const double amount,
371 ExceptionInfo *exception)
374 <p>A description of each parameter follows:</p>
376 <h5>implode_image</h5>
377 <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>
383 <p>Define the extent of the implosion.</p>
386 <p>return any errors or warnings in this structure.</p>
389 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="The_MorphImages">The MorphImages</a></h2>
390 <div class="doc-section">
392 <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>
394 <p>The format of the MorphImage method is:</p>
397 Image *MorphImages(const Image *image,const size_t number_frames,
398 ExceptionInfo *exception)
401 <p>A description of each parameter follows:</p>
406 <h5>number_frames</h5>
407 <p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p>
410 <p>return any errors or warnings in this structure.</p>
413 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PlasmaImage">PlasmaImage</a></h2>
414 <div class="doc-section">
416 <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>
418 <p>The format of the PlasmaImage method is:</p>
421 MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
422 size_t attenuate,size_t depth)
425 <p>A description of each parameter follows:</p>
431 <p> Define the region to apply plasma fractals values.</p>
434 <p>Define the plasma attenuation factor.</p>
437 <p>Limit the plasma recursion depth.</p>
440 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PolaroidImage">PolaroidImage</a></h2>
441 <div class="doc-section">
443 <p>PolaroidImage() simulates a Polaroid picture.</p>
445 <p>The format of the AnnotateImage method is:</p>
448 Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
449 const double angle,ExceptionInfo exception)
452 <p>A description of each parameter follows:</p>
458 <p>the draw info.</p>
461 <p>Apply the effect along this angle.</p>
464 <p>return any errors or warnings in this structure.</p>
467 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="MagickSepiaToneImage">MagickSepiaToneImage</a></h2>
468 <div class="doc-section">
470 <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>
472 <p>The format of the SepiaToneImage method is:</p>
475 Image *SepiaToneImage(const Image *image,const double threshold,
476 ExceptionInfo *exception)
479 <p>A description of each parameter follows:</p>
485 <p>the tone threshold.</p>
488 <p>return any errors or warnings in this structure.</p>
491 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ShadowImage">ShadowImage</a></h2>
492 <div class="doc-section">
494 <p>ShadowImage() simulates a shadow from the specified image and returns it.</p>
496 <p>The format of the ShadowImage method is:</p>
499 Image *ShadowImage(const Image *image,const double opacity,
500 const double sigma,const ssize_t x_offset,const ssize_t y_offset,
501 ExceptionInfo *exception)
504 <p>A description of each parameter follows:</p>
510 <p>percentage transparency.</p>
513 <p>the standard deviation of the Gaussian, in pixels.</p>
516 <p>the shadow x-offset.</p>
519 <p>the shadow y-offset.</p>
522 <p>return any errors or warnings in this structure.</p>
525 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SketchImage">SketchImage</a></h2>
526 <div class="doc-section">
528 <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>
530 <p>The format of the SketchImage method is:</p>
533 Image *SketchImage(const Image *image,const double radius,
534 const double sigma,const double angle,ExceptionInfo *exception)
537 <p>A description of each parameter follows:</p>
543 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
546 <p>the standard deviation of the Gaussian, in pixels.</p>
549 <p>Apply the effect along this angle.</p>
552 <p>return any errors or warnings in this structure.</p>
555 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SolarizeImage">SolarizeImage</a></h2>
556 <div class="doc-section">
558 <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>
560 <p>The format of the SolarizeImage method is:</p>
563 MagickBooleanType SolarizeImage(Image *image,const double threshold)
566 <p>A description of each parameter follows:</p>
572 <p>Define the extent of the solarization.</p>
575 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SteganoImage">SteganoImage</a></h2>
576 <div class="doc-section">
578 <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>
580 <p>The format of the SteganoImage method is:</p>
583 Image *SteganoImage(const Image *image,Image *watermark,
584 ExceptionInfo *exception)
587 <p>A description of each parameter follows:</p>
593 <p>the watermark image.</p>
596 <p>return any errors or warnings in this structure.</p>
599 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="StereoAnaglyphImage">StereoAnaglyphImage</a></h2>
600 <div class="doc-section">
602 <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>
604 <p>The format of the StereoAnaglyphImage method is:</p>
607 Image *StereoImage(const Image *left_image,const Image *right_image,
608 ExceptionInfo *exception)
609 Image *StereoAnaglyphImage(const Image *left_image,
610 const Image *right_image,const ssize_t x_offset,const ssize_t y_offset,
611 ExceptionInfo *exception)
614 <p>A description of each parameter follows:</p>
617 <p>the left image.</p>
620 <p>the right image.</p>
623 <p>return any errors or warnings in this structure.</p>
626 <p>amount, in pixels, by which the left image is offset to the right of the right image.</p>
629 <p>amount, in pixels, by which the left image is offset to the bottom of the right image.</p>
633 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SwirlImage">SwirlImage</a></h2>
634 <div class="doc-section">
636 <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>
638 <p>The format of the SwirlImage method is:</p>
641 Image *SwirlImage(const Image *image,double degrees,
642 ExceptionInfo *exception)
645 <p>A description of each parameter follows:</p>
651 <p>Define the tightness of the swirling effect.</p>
654 <p>return any errors or warnings in this structure.</p>
657 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="TintImage">TintImage</a></h2>
658 <div class="doc-section">
660 <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>
662 <p>The format of the TintImage method is:</p>
665 Image *TintImage(const Image *image,const char *opacity,
666 const PixelPacket tint,ExceptionInfo *exception)
669 <p>A description of each parameter follows:</p>
675 <p>A color value used for tinting.</p>
678 <p>A color value used for tinting.</p>
681 <p>return any errors or warnings in this structure.</p>
684 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="VignetteImage">VignetteImage</a></h2>
685 <div class="doc-section">
687 <p>VignetteImage() softens the edges of the image in vignette style.</p>
689 <p>The format of the VignetteImage method is:</p>
692 Image *VignetteImage(const Image *image,const double radius,
693 const double sigma,const ssize_t x,const ssize_t y,ExceptionInfo *exception)
696 <p>A description of each parameter follows:</p>
702 <p>the radius of the pixel neighborhood.</p>
705 <p>the standard deviation of the Gaussian, in pixels.</p>
708 <p>Define the x and y ellipse offset.</p>
711 <p>return any errors or warnings in this structure.</p>
714 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="WaveImage">WaveImage</a></h2>
715 <div class="doc-section">
717 <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>
719 <p>The format of the WaveImage method is:</p>
722 Image *WaveImage(const Image *image,const double amplitude,
723 const double wave_length,ExceptionInfo *exception)
726 <p>A description of each parameter follows:</p>
731 <h5>amplitude, wave_length</h5>
732 <p>Define the amplitude and wave length of the sine wave.</p>
735 <p>return any errors or warnings in this structure.</p>
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