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194<div class="main">
195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]196<h1>Module fx Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<p class="navigation-index">[<a href="#AddNoiseImage">AddNoiseImage</a> &bull; <a href="#BlueShiftImage">BlueShiftImage</a> &bull; <a href="#CharcoalImage">CharcoalImage</a> &bull; <a href="#ColorizeImage">ColorizeImage</a> &bull; <a href="#ColorMatrixImage">ColorMatrixImage</a> &bull; <a href="#FxImage">FxImage</a> &bull; <a href="#ImplodeImage">ImplodeImage</a> &bull; <a href="#The MorphImages">The MorphImages</a> &bull; <a href="#PlasmaImage">PlasmaImage</a> &bull; <a href="#PolaroidImage">PolaroidImage</a> &bull; <a href="#MagickSepiaToneImage">MagickSepiaToneImage</a> &bull; <a href="#ShadowImage">ShadowImage</a> &bull; <a href="#SketchImage">SketchImage</a> &bull; <a href="#SolarizeImage">SolarizeImage</a> &bull; <a href="#SteganoImage">SteganoImage</a> &bull; <a href="#StereoAnaglyphImage">StereoAnaglyphImage</a> &bull; <a href="#SwirlImage">SwirlImage</a> &bull; <a href="#TintImage">TintImage</a> &bull; <a href="#VignetteImage">VignetteImage</a> &bull; <a href="#WaveImage">WaveImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]198
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]199<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="AddNoiseImage">AddNoiseImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]200<div class="doc-section">
201
202<p>AddNoiseImage() adds random noise to the image.</p>
203
204<p>The format of the AddNoiseImage method is:</p>
205
206<pre class="code">
207 Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
208 ExceptionInfo *exception)
209 Image *AddNoiseImageChannel(const Image *image,const ChannelType channel,
210 const NoiseType noise_type,ExceptionInfo *exception)
211</pre>
212
213<p>A description of each parameter follows:</p>
214
215<h5>image</h5>
216<p>the image.</p>
217
218<h5>channel</h5>
219<p>the channel type.</p>
220
221<h5>noise_type</h5>
222<p>The type of noise: Uniform, Gaussian, Multiplicative, Impulse, Laplacian, or Poisson.</p>
223
224<h5>exception</h5>
225<p>return any errors or warnings in this structure.</p>
226
227 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]228<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="BlueShiftImage">BlueShiftImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]229<div class="doc-section">
230
231<p>BlueShiftImage() mutes the colors of the image to simulate a scene at nighttime in the moonlight.</p>
232
233<p>The format of the BlueShiftImage method is:</p>
234
235<pre class="code">
236 Image *BlueShiftImage(const Image *image,const double factor,
237 ExceptionInfo *exception)
238</pre>
239
240<p>A description of each parameter follows:</p>
241
242<h5>image</h5>
243<p>the image.</p>
244
245<h5>factor</h5>
246<p>the shift factor.</p>
247
248<h5>exception</h5>
249<p>return any errors or warnings in this structure.</p>
250
251 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]252<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="CharcoalImage">CharcoalImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]253<div class="doc-section">
254
255<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>
256
257<p>The format of the CharcoalImage method is:</p>
258
259<pre class="code">
260 Image *CharcoalImage(const Image *image,const double radius,
261 const double sigma,ExceptionInfo *exception)
262</pre>
263
264<p>A description of each parameter follows:</p>
265
266<h5>image</h5>
267<p>the image.</p>
268
269<h5>radius</h5>
270<p>the radius of the pixel neighborhood.</p>
271
272<h5>sigma</h5>
273<p>the standard deviation of the Gaussian, in pixels.</p>
274
275<h5>exception</h5>
276<p>return any errors or warnings in this structure.</p>
277
278 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]279<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorizeImage">ColorizeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]280<div class="doc-section">
281
282<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>
283
284<p>The format of the ColorizeImage method is:</p>
285
286<pre class="code">
287 Image *ColorizeImage(const Image *image,const char *opacity,
288 const PixelPacket colorize,ExceptionInfo *exception)
289</pre>
290
291<p>A description of each parameter follows:</p>
292
293<h5>image</h5>
294<p>the image.</p>
295
296<h5>opacity</h5>
297<p>A character string indicating the level of opacity as a percentage.</p>
298
299<h5>colorize</h5>
300<p>A color value.</p>
301
302<h5>exception</h5>
303<p>return any errors or warnings in this structure.</p>
304
305 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]306<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ColorMatrixImage">ColorMatrixImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]307<div class="doc-section">
308
309<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>
310
311<p>The format of the ColorMatrixImage method is:</p>
312
313<pre class="code">
314 Image *ColorMatrixImage(const Image *image,
315 const KernelInfo *color_matrix,ExceptionInfo *exception)
316</pre>
317
318<p>A description of each parameter follows:</p>
319
320<h5>image</h5>
321<p>the image.</p>
322
323<h5>color_matrix</h5>
324<p>the color matrix.</p>
325
326<h5>exception</h5>
327<p>return any errors or warnings in this structure.</p>
328
329 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]330<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="FxImage">FxImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]331<div class="doc-section">
332
333<p>FxImage() applies a mathematical expression to the specified image.</p>
334
335<p>The format of the FxImage method is:</p>
336
337<pre class="code">
338 Image *FxImage(const Image *image,const char *expression,
339 ExceptionInfo *exception)
340 Image *FxImageChannel(const Image *image,const ChannelType channel,
341 const char *expression,ExceptionInfo *exception)
342</pre>
343
344<p>A description of each parameter follows:</p>
345
346<h5>image</h5>
347<p>the image.</p>
348
349<h5>channel</h5>
350<p>the channel.</p>
351
352<h5>expression</h5>
353<p>A mathematical expression.</p>
354
355<h5>exception</h5>
356<p>return any errors or warnings in this structure.</p>
357
358 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]359<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ImplodeImage">ImplodeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]360<div class="doc-section">
361
362<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>
363
364<p>The format of the ImplodeImage method is:</p>
365
366<pre class="code">
367 Image *ImplodeImage(const Image *image,const double amount,
368 ExceptionInfo *exception)
369</pre>
370
371<p>A description of each parameter follows:</p>
372
373<h5>implode_image</h5>
374<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>
375
376<h5>image</h5>
377<p>the image.</p>
378
379<h5>amount</h5>
380<p>Define the extent of the implosion.</p>
381
382<h5>exception</h5>
383<p>return any errors or warnings in this structure.</p>
384
385 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]386<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="The_MorphImages">The MorphImages</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]387<div class="doc-section">
388
389<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>
390
391<p>The format of the MorphImage method is:</p>
392
393<pre class="code">
394 Image *MorphImages(const Image *image,const size_t number_frames,
395 ExceptionInfo *exception)
396</pre>
397
398<p>A description of each parameter follows:</p>
399
400<h5>image</h5>
401<p>the image.</p>
402
403<h5>number_frames</h5>
404<p>Define the number of in-between image to generate. The more in-between frames, the smoother the morph.</p>
405
406<h5>exception</h5>
407<p>return any errors or warnings in this structure.</p>
408
409 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]410<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PlasmaImage">PlasmaImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]411<div class="doc-section">
412
413<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>
414
415<p>The format of the PlasmaImage method is:</p>
416
417<pre class="code">
418 MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
419 size_t attenuate,size_t depth)
420</pre>
421
422<p>A description of each parameter follows:</p>
423
424<h5>image</h5>
425<p>the image.</p>
426
427<h5>segment</h5>
428<p> Define the region to apply plasma fractals values.</p>
429
430<h5>attenuate</h5>
431<p>Define the plasma attenuation factor.</p>
432
433<h5>depth</h5>
434<p>Limit the plasma recursion depth.</p>
435
436 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]437<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="PolaroidImage">PolaroidImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]438<div class="doc-section">
439
440<p>PolaroidImage() simulates a Polaroid picture.</p>
441
442<p>The format of the AnnotateImage method is:</p>
443
444<pre class="code">
445 Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
446 const double angle,ExceptionInfo exception)
447</pre>
448
449<p>A description of each parameter follows:</p>
450
451<h5>image</h5>
452<p>the image.</p>
453
454<h5>draw_info</h5>
455<p>the draw info.</p>
456
457<h5>angle</h5>
458<p>Apply the effect along this angle.</p>
459
460<h5>exception</h5>
461<p>return any errors or warnings in this structure.</p>
462
463 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]464<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="MagickSepiaToneImage">MagickSepiaToneImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]465<div class="doc-section">
466
467<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>
468
469<p>The format of the SepiaToneImage method is:</p>
470
471<pre class="code">
472 Image *SepiaToneImage(const Image *image,const double threshold,
473 ExceptionInfo *exception)
474</pre>
475
476<p>A description of each parameter follows:</p>
477
478<h5>image</h5>
479<p>the image.</p>
480
481<h5>threshold</h5>
482<p>the tone threshold.</p>
483
484<h5>exception</h5>
485<p>return any errors or warnings in this structure.</p>
486
487 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]488<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="ShadowImage">ShadowImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]489<div class="doc-section">
490
491<p>ShadowImage() simulates a shadow from the specified image and returns it.</p>
492
493<p>The format of the ShadowImage method is:</p>
494
495<pre class="code">
496 Image *ShadowImage(const Image *image,const double opacity,
497 const double sigma,const ssize_t x_offset,const ssize_t y_offset,
498 ExceptionInfo *exception)
499</pre>
500
501<p>A description of each parameter follows:</p>
502
503<h5>image</h5>
504<p>the image.</p>
505
506<h5>opacity</h5>
507<p>percentage transparency.</p>
508
509<h5>sigma</h5>
510<p>the standard deviation of the Gaussian, in pixels.</p>
511
512<h5>x_offset</h5>
513<p>the shadow x-offset.</p>
514
515<h5>y_offset</h5>
516<p>the shadow y-offset.</p>
517
518<h5>exception</h5>
519<p>return any errors or warnings in this structure.</p>
520
521 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]522<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SketchImage">SketchImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]523<div class="doc-section">
524
525<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>
526
527<p>The format of the SketchImage method is:</p>
528
529<pre class="code">
530 Image *SketchImage(const Image *image,const double radius,
531 const double sigma,const double angle,ExceptionInfo *exception)
532</pre>
533
534<p>A description of each parameter follows:</p>
535
536<h5>image</h5>
537<p>the image.</p>
538
539<h5>radius</h5>
540<p>the radius of the Gaussian, in pixels, not counting the center pixel.</p>
541
542<h5>sigma</h5>
543<p>the standard deviation of the Gaussian, in pixels.</p>
544
545<h5>angle</h5>
546<p>Apply the effect along this angle.</p>
547
548<h5>exception</h5>
549<p>return any errors or warnings in this structure.</p>
550
551 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]552<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SolarizeImage">SolarizeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]553<div class="doc-section">
554
555<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>
556
557<p>The format of the SolarizeImage method is:</p>
558
559<pre class="code">
560 MagickBooleanType SolarizeImage(Image *image,const double threshold)
561</pre>
562
563<p>A description of each parameter follows:</p>
564
565<h5>image</h5>
566<p>the image.</p>
567
568<h5>threshold</h5>
569<p>Define the extent of the solarization.</p>
570
571 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]572<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SteganoImage">SteganoImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]573<div class="doc-section">
574
575<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>
576
577<p>The format of the SteganoImage method is:</p>
578
579<pre class="code">
580 Image *SteganoImage(const Image *image,Image *watermark,
581 ExceptionInfo *exception)
582</pre>
583
584<p>A description of each parameter follows:</p>
585
586<h5>image</h5>
587<p>the image.</p>
588
589<h5>watermark</h5>
590<p>the watermark image.</p>
591
592<h5>exception</h5>
593<p>return any errors or warnings in this structure.</p>
594
595 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]596<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="StereoAnaglyphImage">StereoAnaglyphImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]597<div class="doc-section">
598
599<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>
600
601<p>The format of the StereoAnaglyphImage method is:</p>
602
603<pre class="code">
604 Image *StereoImage(const Image *left_image,const Image *right_image,
605 ExceptionInfo *exception)
606 Image *StereoAnaglyphImage(const Image *left_image,
607 const Image *right_image,const ssize_t x_offset,const ssize_t y_offset,
608 ExceptionInfo *exception)
609</pre>
610
611<p>A description of each parameter follows:</p>
612
613<h5>left_image</h5>
614<p>the left image.</p>
615
616<h5>right_image</h5>
617<p>the right image.</p>
618
619<h5>exception</h5>
620<p>return any errors or warnings in this structure.</p>
621
622<h5>x_offset</h5>
623<p>amount, in pixels, by which the left image is offset to the right of the right image.</p>
624
625<h5>y_offset</h5>
626<p>amount, in pixels, by which the left image is offset to the bottom of the right image.</p>
627
628
629 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]630<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="SwirlImage">SwirlImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]631<div class="doc-section">
632
633<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>
634
635<p>The format of the SwirlImage method is:</p>
636
637<pre class="code">
638 Image *SwirlImage(const Image *image,double degrees,
639 ExceptionInfo *exception)
640</pre>
641
642<p>A description of each parameter follows:</p>
643
644<h5>image</h5>
645<p>the image.</p>
646
647<h5>degrees</h5>
648<p>Define the tightness of the swirling effect.</p>
649
650<h5>exception</h5>
651<p>return any errors or warnings in this structure.</p>
652
653 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]654<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="TintImage">TintImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]655<div class="doc-section">
656
657<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>
658
659<p>The format of the TintImage method is:</p>
660
661<pre class="code">
662 Image *TintImage(const Image *image,const char *opacity,
663 const PixelPacket tint,ExceptionInfo *exception)
664</pre>
665
666<p>A description of each parameter follows:</p>
667
668<h5>image</h5>
669<p>the image.</p>
670
671<h5>opacity</h5>
672<p>A color value used for tinting.</p>
673
674<h5>tint</h5>
675<p>A color value used for tinting.</p>
676
677<h5>exception</h5>
678<p>return any errors or warnings in this structure.</p>
679
680 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]681<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="VignetteImage">VignetteImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]682<div class="doc-section">
683
684<p>VignetteImage() softens the edges of the image in vignette style.</p>
685
686<p>The format of the VignetteImage method is:</p>
687
688<pre class="code">
689 Image *VignetteImage(const Image *image,const double radius,
690 const double sigma,const ssize_t x,const ssize_t y,ExceptionInfo *exception)
691</pre>
692
693<p>A description of each parameter follows:</p>
694
695<h5>image</h5>
696<p>the image.</p>
697
698<h5>radius</h5>
699<p>the radius of the pixel neighborhood.</p>
700
701<h5>sigma</h5>
702<p>the standard deviation of the Gaussian, in pixels.</p>
703
704<h5>x, y</h5>
705<p>Define the x and y ellipse offset.</p>
706
707<h5>exception</h5>
708<p>return any errors or warnings in this structure.</p>
709
710 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]711<h2><a href="http://www.imagemagick.org/api/MagickCore/fx_8c.html" id="WaveImage">WaveImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]712<div class="doc-section">
713
714<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>
715
716<p>The format of the WaveImage method is:</p>
717
718<pre class="code">
719 Image *WaveImage(const Image *image,const double amplitude,
720 const double wave_length,ExceptionInfo *exception)
721</pre>
722
723<p>A description of each parameter follows:</p>
724
725<h5>image</h5>
726<p>the image.</p>
727
728<h5>amplitude, wave_length</h5>
729<p>Define the amplitude and wave length of the sine wave.</p>
730
731<h5>exception</h5>
732<p>return any errors or warnings in this structure.</p>
733
734 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]735
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