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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="#EvaluateImage">EvaluateImage</a> • <a href="#FunctionImage">FunctionImage</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="EvaluateImage">EvaluateImage</a></h2>
270 <div class="doc-section">
272 <p>EvaluateImage() applies a value to the image with an arithmetic, relational, or logical operator to an image. Use these operations to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.</p></ol>
274 <p>The format of the EvaluateImageChannel method is:</p>
277 MagickBooleanType EvaluateImage(Image *image,
278 const MagickEvaluateOperator op,const double value,
279 ExceptionInfo *exception)
280 MagickBooleanType EvaluateImageChannel(Image *image,
281 const ChannelType channel,const MagickEvaluateOperator op,
282 const double value,ExceptionInfo *exception)
285 <p>A description of each parameter follows:</p></ol>
288 <ol><p>the image.</p></ol>
291 <ol><p>the channel.</p></ol>
294 <ol><p>A channel op.</p></ol>
297 <ol><p>A value value.</p></ol>
300 <ol><p>return any errors or warnings in this structure.</p></ol>
303 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
304 _8c.html" target="source" name="FunctionImage">FunctionImage</a></h2>
305 <div class="doc-section">
307 <p>FunctionImage() applies a value to the image with an arithmetic, relational, or logical operator to an image. Use these operations to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image.</p></ol>
309 <p>The format of the FunctionImageChannel method is:</p>
312 MagickBooleanType FunctionImage(Image *image,
313 const MagickFunction function,const long number_parameters,
314 const double *parameters,ExceptionInfo *exception)
315 MagickBooleanType FunctionImageChannel(Image *image,
316 const ChannelType channel,const MagickFunction function,
317 const long number_parameters,const double *argument,
318 ExceptionInfo *exception)
321 <p>A description of each parameter follows:</p></ol>
324 <ol><p>the image.</p></ol>
327 <ol><p>the channel.</p></ol>
330 <ol><p>A channel function.</p></ol>
333 <ol><p>one or more parameters.</p></ol>
336 <ol><p>return any errors or warnings in this structure.</p></ol>
339 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
340 _8c.html" target="source" name="FxImage">FxImage</a></h2>
341 <div class="doc-section">
343 <p>FxImage() applies a mathematical expression to the specified image.</p></ol>
345 <p>The format of the FxImage method is:</p>
348 Image *FxImage(const Image *image,const char *expression,
349 ExceptionInfo *exception)
350 Image *FxImageChannel(const Image *image,const ChannelType channel,
351 const char *expression,ExceptionInfo *exception)
354 <p>A description of each parameter follows:</p></ol>
357 <ol><p>the image.</p></ol>
360 <ol><p>the channel.</p></ol>
363 <ol><p>A mathematical expression.</p></ol>
366 <ol><p>return any errors or warnings in this structure.</p></ol>
369 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
370 _8c.html" target="source" name="ImplodeImage">ImplodeImage</a></h2>
371 <div class="doc-section">
373 <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>
375 <p>The format of the ImplodeImage method is:</p>
378 Image *ImplodeImage(const Image *image,const double amount,
379 ExceptionInfo *exception)
382 <p>A description of each parameter follows:</p></ol>
384 <h5>implode_image</h5>
385 <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>
388 <ol><p>the image.</p></ol>
391 <ol><p>Define the extent of the implosion.</p></ol>
394 <ol><p>return any errors or warnings in this structure.</p></ol>
397 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
398 _8c.html" target="source" name="The MorphImages">The MorphImages</a></h2>
399 <div class="doc-section">
401 <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>
403 <p>The format of the MorphImage method is:</p>
406 Image *MorphImages(const Image *image,const unsigned long number_frames,
407 ExceptionInfo *exception)
410 <p>A description of each parameter follows:</p></ol>
413 <ol><p>the image.</p></ol>
415 <h5>number_frames</h5>
416 <ol><p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p></ol>
419 <ol><p>return any errors or warnings in this structure.</p></ol>
422 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
423 _8c.html" target="source" name="PlasmaImage">PlasmaImage</a></h2>
424 <div class="doc-section">
426 <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>
428 <p>The format of the PlasmaImage method is:</p>
431 MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
432 unsigned long attenuate,unsigned long depth)
435 <p>A description of each parameter follows:</p></ol>
438 <ol><p>the image.</p></ol>
441 <ol><p> Define the region to apply plasma fractals values.</p></ol>
444 <ol><p>Define the plasmattenuation factor.</p></ol>
447 <ol><p>Limit the plasma recursion depth.</p></ol>
450 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
451 _8c.html" target="source" name="PolaroidImage">PolaroidImage</a></h2>
452 <div class="doc-section">
454 <p>PolaroidImage() simulates a Polaroid picture.</p></ol>
456 <p>The format of the AnnotateImage method is:</p>
459 Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
460 const double angle,ExceptionInfo exception)
463 <p>A description of each parameter follows:</p></ol>
466 <ol><p>the image.</p></ol>
469 <ol><p>the draw info.</p></ol>
472 <ol><p>Apply the effect along this angle.</p></ol>
475 <ol><p>return any errors or warnings in this structure.</p></ol>
478 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
479 _8c.html" target="source" name="RecolorImage">RecolorImage</a></h2>
480 <div class="doc-section">
482 <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>
484 <p>The format of the RecolorImage method is:</p>
487 Image *RecolorImage(const Image *image,const unsigned long order,
488 const double *color_matrix,ExceptionInfo *exception)
491 <p>A description of each parameter follows:</p></ol>
494 <ol><p>the image.</p></ol>
497 <ol><p>the number of columns and rows in the recolor matrix.</p></ol>
499 <h5>color_matrix</h5>
500 <ol><p>An array of double representing the recolor matrix.</p></ol>
503 <ol><p>return any errors or warnings in this structure.</p></ol>
506 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
507 _8c.html" target="source" name="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></ol>
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></ol>
522 <ol><p>the image.</p></ol>
525 <ol><p>the tone threshold.</p></ol>
528 <ol><p>return any errors or warnings in this structure.</p></ol>
531 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
532 _8c.html" target="source" name="ShadowImage">ShadowImage</a></h2>
533 <div class="doc-section">
535 <p>ShadowImage() simulates a shadow from the specified image and returns it.</p></ol>
537 <p>The format of the ShadowImage method is:</p>
540 Image *ShadowImage(const Image *image,const double opacity,
541 const double sigma,const long x_offset,const long y_offset,
542 ExceptionInfo *exception)
545 <p>A description of each parameter follows:</p></ol>
548 <ol><p>the image.</p></ol>
551 <ol><p>percentage transparency.</p></ol>
554 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
557 <ol><p>the shadow x-offset.</p></ol>
560 <ol><p>the shadow y-offset.</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="SketchImage">SketchImage</a></h2>
568 <div class="doc-section">
570 <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>
572 <p>The format of the SketchImage method is:</p>
575 Image *SketchImage(const Image *image,const double radius,
576 const double sigma,const double angle,ExceptionInfo *exception)
579 <p>A description of each parameter follows:</p></ol>
582 <ol><p>the image.</p></ol>
585 <ol><p>the radius of the Gaussian, in pixels, not counting the center pixel.</p></ol>
588 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
591 <ol><p>Apply the effect along this angle.</p></ol>
594 <ol><p>return any errors or warnings in this structure.</p></ol>
597 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
598 _8c.html" target="source" name="SolarizeImage">SolarizeImage</a></h2>
599 <div class="doc-section">
601 <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>
603 <p>The format of the SolarizeImage method is:</p>
606 MagickBooleanType SolarizeImage(Image *image,const double threshold)
609 <p>A description of each parameter follows:</p></ol>
612 <ol><p>the image.</p></ol>
615 <ol><p>Define the extent of the solarization.</p></ol>
618 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
619 _8c.html" target="source" name="SteganoImage">SteganoImage</a></h2>
620 <div class="doc-section">
622 <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>
624 <p>The format of the SteganoImage method is:</p>
627 Image *SteganoImage(const Image *image,Image *watermark,
628 ExceptionInfo *exception)
631 <p>A description of each parameter follows:</p></ol>
634 <ol><p>the image.</p></ol>
637 <ol><p>the watermark image.</p></ol>
640 <ol><p>return any errors or warnings in this structure.</p></ol>
643 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
644 _8c.html" target="source" name="StereoAnaglyphImage">StereoAnaglyphImage</a></h2>
645 <div class="doc-section">
647 <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>
649 <p>The format of the StereoAnaglyphImage method is:</p>
652 Image *StereoImage(const Image *left_image,const Image *right_image,
653 ExceptionInfo *exception)
654 Image *StereoAnaglyphImage(const Image *left_image,
655 const Image *right_image,const long x_offset,const long y_offset,
656 ExceptionInfo *exception)
659 <p>A description of each parameter follows:</p></ol>
662 <ol><p>the left image.</p></ol>
665 <ol><p>the right image.</p></ol>
668 <ol><p>return any errors or warnings in this structure.</p></ol>
671 <ol><p>amount, in pixels, by which the left image is offset to the right of the right image.</p></ol>
674 <ol><p>amount, in pixels, by which the left image is offset to the bottom of the right image.</p></ol>
678 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
679 _8c.html" target="source" name="SwirlImage">SwirlImage</a></h2>
680 <div class="doc-section">
682 <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>
684 <p>The format of the SwirlImage method is:</p>
687 Image *SwirlImage(const Image *image,double degrees,
688 ExceptionInfo *exception)
691 <p>A description of each parameter follows:</p></ol>
694 <ol><p>the image.</p></ol>
697 <ol><p>Define the tightness of the swirling effect.</p></ol>
700 <ol><p>return any errors or warnings in this structure.</p></ol>
703 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
704 _8c.html" target="source" name="TintImage">TintImage</a></h2>
705 <div class="doc-section">
707 <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>
709 <p>The format of the TintImage method is:</p>
712 Image *TintImage(const Image *image,const char *opacity,
713 const PixelPacket tint,ExceptionInfo *exception)
716 <p>A description of each parameter follows:</p></ol>
719 <ol><p>the image.</p></ol>
722 <ol><p>A color value used for tinting.</p></ol>
725 <ol><p>A color value used for tinting.</p></ol>
728 <ol><p>return any errors or warnings in this structure.</p></ol>
731 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
732 _8c.html" target="source" name="VignetteImage">VignetteImage</a></h2>
733 <div class="doc-section">
735 <p>VignetteImage() softens the edges of the image in vignette style.</p></ol>
737 <p>The format of the VignetteImage method is:</p>
740 Image *VignetteImage(const Image *image,const double radius,
741 const double sigma,const long x,const long y,ExceptionInfo *exception)
744 <p>A description of each parameter follows:</p></ol>
747 <ol><p>the image.</p></ol>
750 <ol><p>the radius of the pixel neighborhood.</p></ol>
753 <ol><p>the standard deviation of the Gaussian, in pixels.</p></ol>
756 <ol><p>Define the x and y ellipse offset.</p></ol>
759 <ol><p>return any errors or warnings in this structure.</p></ol>
762 <h2><a href="http://www.imagemagick.org/api/MagickCore/fx
763 _8c.html" target="source" name="WaveImage">WaveImage</a></h2>
764 <div class="doc-section">
766 <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>
768 <p>The format of the WaveImage method is:</p>
771 Image *WaveImage(const Image *image,const double amplitude,
772 const double wave_length,ExceptionInfo *exception)
775 <p>A description of each parameter follows:</p></ol>
778 <ol><p>the image.</p></ol>
780 <h5>amplitude, wave_length</h5>
781 <ol><p>Define the amplitude and wave length of the sine wave.</p></ol>
784 <ol><p>return any errors or warnings in this structure.</p></ol>
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