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239 <h1>Module fx Methods</h1>
240 <p class="navigation-index">[<a href="fx.html#AddNoiseImage">AddNoiseImage</a> • <a href="fx.html#BlueShiftImage">BlueShiftImage</a> • <a href="fx.html#CharcoalImage">CharcoalImage</a> • <a href="fx.html#ColorizeImage">ColorizeImage</a> • <a href="fx.html#ColorMatrixImage">ColorMatrixImage</a> • <a href="fx.html#FxImage">FxImage</a> • <a href="fx.html#ImplodeImage">ImplodeImage</a> • <a href="fx.html#The MorphImages">The MorphImages</a> • <a href="fx.html#PlasmaImage">PlasmaImage</a> • <a href="fx.html#PolaroidImage">PolaroidImage</a> • <a href="fx.html#MagickSepiaToneImage">MagickSepiaToneImage</a> • <a href="fx.html#ShadowImage">ShadowImage</a> • <a href="fx.html#SketchImage">SketchImage</a> • <a href="fx.html#SolarizeImage">SolarizeImage</a> • <a href="fx.html#SteganoImage">SteganoImage</a> • <a href="fx.html#StereoAnaglyphImage">StereoAnaglyphImage</a> • <a href="fx.html#SwirlImage">SwirlImage</a> • <a href="fx.html#TintImage">TintImage</a> • <a href="fx.html#VignetteImage">VignetteImage</a> • <a href="fx.html#WaveImage">WaveImage</a>]</p>
242 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="AddNoiseImage">AddNoiseImage</a></h2>
243 <div class="doc-section">
245 <p>AddNoiseImage() adds random noise to the image.</p>
247 <p>The format of the AddNoiseImage method is:</p>
250 Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
251 ExceptionInfo *exception)
252 Image *AddNoiseImageChannel(const Image *image,const ChannelType channel,
253 const NoiseType noise_type,ExceptionInfo *exception)
256 <p>A description of each parameter follows:</p>
262 <p>the channel type.</p>
265 <p>The type of noise: Uniform, Gaussian, Multiplicative, Impulse, Laplacian, or Poisson.</p>
268 <p>return any errors or warnings in this structure.</p>
271 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="BlueShiftImage">BlueShiftImage</a></h2>
272 <div class="doc-section">
274 <p>BlueShiftImage() mutes the colors of the image to simulate a scene at nighttime in the moonlight.</p>
276 <p>The format of the BlueShiftImage method is:</p>
279 Image *BlueShiftImage(const Image *image,const double factor,
280 ExceptionInfo *exception)
283 <p>A description of each parameter follows:</p>
289 <p>the shift factor.</p>
292 <p>return any errors or warnings in this structure.</p>
295 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="CharcoalImage">CharcoalImage</a></h2>
296 <div class="doc-section">
298 <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>
300 <p>The format of the CharcoalImage method is:</p>
303 Image *CharcoalImage(const Image *image,const double radius,
304 const double sigma,ExceptionInfo *exception)
307 <p>A description of each parameter follows:</p>
313 <p>the radius of the pixel neighborhood.</p>
316 <p>the standard deviation of the Gaussian, in pixels.</p>
319 <p>return any errors or warnings in this structure.</p>
322 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorizeImage">ColorizeImage</a></h2>
323 <div class="doc-section">
325 <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>
327 <p>The format of the ColorizeImage method is:</p>
330 Image *ColorizeImage(const Image *image,const char *opacity,
331 const PixelPacket colorize,ExceptionInfo *exception)
334 <p>A description of each parameter follows:</p>
340 <p>A character string indicating the level of opacity as a percentage.</p>
343 <p>A color value.</p>
346 <p>return any errors or warnings in this structure.</p>
349 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorMatrixImage">ColorMatrixImage</a></h2>
350 <div class="doc-section">
352 <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>
354 <p>The format of the ColorMatrixImage method is:</p>
357 Image *ColorMatrixImage(const Image *image,
358 const KernelInfo *color_matrix,ExceptionInfo *exception)
361 <p>A description of each parameter follows:</p>
366 <h5>color_matrix</h5>
367 <p>the color matrix.</p>
370 <p>return any errors or warnings in this structure.</p>
373 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="FxImage">FxImage</a></h2>
374 <div class="doc-section">
376 <p>FxImage() applies a mathematical expression to the specified image.</p>
378 <p>The format of the FxImage method is:</p>
381 Image *FxImage(const Image *image,const char *expression,
382 ExceptionInfo *exception)
383 Image *FxImageChannel(const Image *image,const ChannelType channel,
384 const char *expression,ExceptionInfo *exception)
387 <p>A description of each parameter follows:</p>
396 <p>A mathematical expression.</p>
399 <p>return any errors or warnings in this structure.</p>
402 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ImplodeImage">ImplodeImage</a></h2>
403 <div class="doc-section">
405 <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>
407 <p>The format of the ImplodeImage method is:</p>
410 Image *ImplodeImage(const Image *image,const double amount,
411 ExceptionInfo *exception)
414 <p>A description of each parameter follows:</p>
416 <h5>implode_image</h5>
417 <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>
423 <p>Define the extent of the implosion.</p>
426 <p>return any errors or warnings in this structure.</p>
429 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="The_MorphImages">The MorphImages</a></h2>
430 <div class="doc-section">
432 <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>
434 <p>The format of the MorphImage method is:</p>
437 Image *MorphImages(const Image *image,const size_t number_frames,
438 ExceptionInfo *exception)
441 <p>A description of each parameter follows:</p>
446 <h5>number_frames</h5>
447 <p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p>
450 <p>return any errors or warnings in this structure.</p>
453 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PlasmaImage">PlasmaImage</a></h2>
454 <div class="doc-section">
456 <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>
458 <p>The format of the PlasmaImage method is:</p>
461 MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
462 size_t attenuate,size_t depth)
465 <p>A description of each parameter follows:</p>
471 <p> Define the region to apply plasma fractals values.</p>
474 <p>Define the plasma attenuation factor.</p>
477 <p>Limit the plasma recursion depth.</p>
480 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PolaroidImage">PolaroidImage</a></h2>
481 <div class="doc-section">
483 <p>PolaroidImage() simulates a Polaroid picture.</p>
485 <p>The format of the AnnotateImage method is:</p>
488 Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
489 const double angle,ExceptionInfo exception)
492 <p>A description of each parameter follows:</p>
498 <p>the draw info.</p>
501 <p>Apply the effect along this angle.</p>
504 <p>return any errors or warnings in this structure.</p>
507 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="MagickSepiaToneImage">MagickSepiaToneImage</a></h2>
508 <div class="doc-section">
510 <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>
512 <p>The format of the SepiaToneImage method is:</p>
515 Image *SepiaToneImage(const Image *image,const double threshold,
516 ExceptionInfo *exception)
519 <p>A description of each parameter follows:</p>
525 <p>the tone threshold.</p>
528 <p>return any errors or warnings in this structure.</p>
531 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ShadowImage">ShadowImage</a></h2>
532 <div class="doc-section">
534 <p>ShadowImage() simulates a shadow from the specified image and returns it.</p>
536 <p>The format of the ShadowImage method is:</p>
539 Image *ShadowImage(const Image *image,const double opacity,
540 const double sigma,const ssize_t x_offset,const ssize_t y_offset,
541 ExceptionInfo *exception)
544 <p>A description of each parameter follows:</p>
550 <p>percentage transparency.</p>
553 <p>the standard deviation of the Gaussian, in pixels.</p>
556 <p>the shadow x-offset.</p>
559 <p>the shadow y-offset.</p>
562 <p>return any errors or warnings in this structure.</p>
565 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SketchImage">SketchImage</a></h2>
566 <div class="doc-section">
568 <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>
570 <p>The format of the SketchImage method is:</p>
573 Image *SketchImage(const Image *image,const double radius,
574 const double sigma,const double angle,ExceptionInfo *exception)
577 <p>A description of each parameter follows:</p>
583 <p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
586 <p>the standard deviation of the Gaussian, in pixels.</p>
589 <p>Apply the effect along this angle.</p>
592 <p>return any errors or warnings in this structure.</p>
595 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SolarizeImage">SolarizeImage</a></h2>
596 <div class="doc-section">
598 <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>
600 <p>The format of the SolarizeImage method is:</p>
603 MagickBooleanType SolarizeImage(Image *image,const double threshold)
606 <p>A description of each parameter follows:</p>
612 <p>Define the extent of the solarization.</p>
615 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SteganoImage">SteganoImage</a></h2>
616 <div class="doc-section">
618 <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>
620 <p>The format of the SteganoImage method is:</p>
623 Image *SteganoImage(const Image *image,Image *watermark,
624 ExceptionInfo *exception)
627 <p>A description of each parameter follows:</p>
633 <p>the watermark image.</p>
636 <p>return any errors or warnings in this structure.</p>
639 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="StereoAnaglyphImage">StereoAnaglyphImage</a></h2>
640 <div class="doc-section">
642 <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>
644 <p>The format of the StereoAnaglyphImage method is:</p>
647 Image *StereoImage(const Image *left_image,const Image *right_image,
648 ExceptionInfo *exception)
649 Image *StereoAnaglyphImage(const Image *left_image,
650 const Image *right_image,const ssize_t x_offset,const ssize_t y_offset,
651 ExceptionInfo *exception)
654 <p>A description of each parameter follows:</p>
657 <p>the left image.</p>
660 <p>the right image.</p>
663 <p>return any errors or warnings in this structure.</p>
666 <p>amount, in pixels, by which the left image is offset to the right of the right image.</p>
669 <p>amount, in pixels, by which the left image is offset to the bottom of the right image.</p>
673 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SwirlImage">SwirlImage</a></h2>
674 <div class="doc-section">
676 <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>
678 <p>The format of the SwirlImage method is:</p>
681 Image *SwirlImage(const Image *image,double degrees,
682 ExceptionInfo *exception)
685 <p>A description of each parameter follows:</p>
691 <p>Define the tightness of the swirling effect.</p>
694 <p>return any errors or warnings in this structure.</p>
697 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="TintImage">TintImage</a></h2>
698 <div class="doc-section">
700 <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>
702 <p>The format of the TintImage method is:</p>
705 Image *TintImage(const Image *image,const char *opacity,
706 const PixelPacket tint,ExceptionInfo *exception)
709 <p>A description of each parameter follows:</p>
715 <p>A color value used for tinting.</p>
718 <p>A color value used for tinting.</p>
721 <p>return any errors or warnings in this structure.</p>
724 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="VignetteImage">VignetteImage</a></h2>
725 <div class="doc-section">
727 <p>VignetteImage() softens the edges of the image in vignette style.</p>
729 <p>The format of the VignetteImage method is:</p>
732 Image *VignetteImage(const Image *image,const double radius,
733 const double sigma,const ssize_t x,const ssize_t y,ExceptionInfo *exception)
736 <p>A description of each parameter follows:</p>
742 <p>the radius of the pixel neighborhood.</p>
745 <p>the standard deviation of the Gaussian, in pixels.</p>
748 <p>Define the x and y ellipse offset.</p>
751 <p>return any errors or warnings in this structure.</p>
754 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="WaveImage">WaveImage</a></h2>
755 <div class="doc-section">
757 <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>
759 <p>The format of the WaveImage method is:</p>
762 Image *WaveImage(const Image *image,const double amplitude,
763 const double wave_length,ExceptionInfo *exception)
766 <p>A description of each parameter follows:</p>
771 <h5>amplitude, wave_length</h5>
772 <p>Define the amplitude and wave length of the sine wave.</p>
775 <p>return any errors or warnings in this structure.</p>
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