ImageMagick: MagickCore, C API for ImageMagick: Add a Special Effect
Author: ImageMagick Studio LLC
Description: ImageMagick® is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves. ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you can freely use, copy, modify, and distribute. Its license is compatible with the GPL. It runs on all major operating systems. The functionality of ImageMagick is typically utilized from the command line or you can use the features from programs written in your favorite programming language. Choose from these interfaces: MagickCore (C), MagickWand (C), ChMagick (Ch), Magick++ (C++), JMagick (Java), L-Magick (Lisp), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP (P [cell cut: 1167 characters, first 1000 kept]
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## CharcoalImage 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. The format of the CharcoalImage method is:
      Image *CharcoalImage(const Image *image,const double radius,
        const double sigma,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### radius the radius of the pixel neighborhood. ##### sigma The standard deviation of the Gaussian, in pixels. ##### exception Return any errors or warnings in this structure. ## ColorizeImage 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). The format of the ColorizeImage method is:
      Image *ColorizeImage(const Image *image,const char *opacity,
        const PixelPacket colorize,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### opacity A character string indicating the level of opacity as a percentage. ##### colorize A color value. ##### exception Return any errors or warnings in this structure. ## ConvolveImage ConvolveImage() applies a custom convolution kernel to the image. The format of the ConvolveImage method is:
      Image *ConvolveImage(const Image *image,const unsigned long order,
        const double *kernel,ExceptionInfo *exception)
      Image *ConvolveImageChannel(const Image *image,const ChannelType channel,
        const unsigned long order,const double *kernel,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### channel The channel type. ##### order The number of columns and rows in the filter kernel. ##### kernel An array of double representing the convolution kernel. ##### exception Return any errors or warnings in this structure. ## EvaluateImage 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. The format of the EvaluateImageChannel method is:
      MagickBooleanType EvaluateImage(Image *image,
        const MagickEvaluateOperator op,const double value,
        ExceptionInfo *exception)
      MagickBooleanType EvaluateImageChannel(Image *image,
        const ChannelType channel,const MagickEvaluateOperator op,
        const double value,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### channel The channel. ##### op A channel op. ##### value A value value. ##### exception Return any errors or warnings in this structure. ## FxImage FxImage() applies a mathematical expression to the specified image. The format of the FxImage method is:
      Image *FxImage(const Image *image,const char *expression,
        ExceptionInfo *exception)
      Image *FxImageChannel(const Image *image,const ChannelType channel,
        const char *expression,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### channel The channel. ##### expression A mathematical expression. ##### exception Return any errors or warnings in this structure. ## ImplodeImage 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. The format of the ImplodeImage method is:
      Image *ImplodeImage(const Image *image,const double amount,
        ExceptionInfo *exception)
A description of each parameter follows: ##### implode_image Method ImplodeImage returns a pointer to the image after it is implode. A null image is returned if there is a memory shortage. ##### image The image. ##### amount Define the extent of the implosion. ##### exception Return any errors or warnings in this structure. ## The MorphImages 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. The format of the MorphImage method is:
      Image *MorphImages(const Image *image,const unsigned long number_frames,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### number_frames Define the number of in-between image to generate. The more in-between frames, the smoother the morph. ##### exception Return any errors or warnings in this structure. ## OilPaintImage OilPaintImage() applies a special effect filter that simulates an oil painting. Each pixel is replaced by the most frequent color occurring in a circular region defined by radius. The format of the OilPaintImage method is:
      Image *OilPaintImage(const Image *image,const double radius,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### radius The radius of the circular neighborhood. ##### exception Return any errors or warnings in this structure. ## PolaroidImage PolaroidImage() simulates a Polaroid picture. The format of the AnnotateImage method is:
      Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
        const double angle,ExceptionInfo exception)
A description of each parameter follows: ##### image The image. ##### draw_info The draw info. ##### angle Apply the effect along this angle. ##### exception Return any errors or warnings in this structure. ## RecolorImage 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. The format of the RecolorImage method is:
      Image *RecolorImage(const Image *image,const unsigned long order,
        const double *color_matrix,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### order The number of columns and rows in the recolor matrix. ##### color_matrix An array of double representing the recolor matrix. ##### exception Return any errors or warnings in this structure. ## MagickSepiaToneImage 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. The format of the SepiaToneImage method is:
      Image *SepiaToneImage(const Image *image,const double threshold,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### threshold The tone threshold. ##### exception Return any errors or warnings in this structure. ## ShadowImage ShadowImage() simulates a shadow from the specified image and returns it. The format of the ShadowImage method is:
      Image *ShadowImage(const Image *image,const double opacity,
        const double sigma,const long x_offset,const long y_offset,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### opacity percentage transparency. ##### sigma The standard deviation of the Gaussian, in pixels. ##### x_offset the shadow x-offset. ##### y_offset the shadow y-offset. ##### exception Return any errors or warnings in this structure. ## SketchImage 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. The format of the SketchImage method is:
          Image *SketchImage(const Image *image,const double radius,
      const double sigma,const double angle,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### radius The radius of the Gaussian, in pixels, not counting the center pixel. ##### sigma The standard deviation of the Gaussian, in pixels. ##### angle Apply the effect along this angle. ##### exception Return any errors or warnings in this structure. ## SolarizeImage 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. The format of the SolarizeImage method is:
      MagickBooleanType SolarizeImage(Image *image,const double threshold)
A description of each parameter follows: ##### image The image. ##### threshold Define the extent of the solarization. ## SteganoImage 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. The format of the SteganoImage method is:
      Image *SteganoImage(const Image *image,Image *watermark,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### watermark The watermark image. ##### exception Return any errors or warnings in this structure. ## StereoImage StereoImage() 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. The format of the StereoImage method is:
      Image *StereoImage(const Image *image,const Image *offset_image,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### offset_image Another image. ##### exception Return any errors or warnings in this structure. ## SwirlImage 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. The format of the SwirlImage method is:
      Image *SwirlImage(const Image *image,double degrees,
        ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### degrees Define the tightness of the swirling effect. ##### exception Return any errors or warnings in this structure. ## TintImage 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)))) The format of the TintImage method is:
      Image *TintImage(const Image *image,const char *opacity,
        const PixelPacket tint,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### opacity A color value used for tinting. ##### tint A color value used for tinting. ##### exception Return any errors or warnings in this structure. ## VignetteImage VignetteImage() softens the edges of the image in vignette style. The format of the VignetteImage method is:
      Image *VignetteImage(const Image *image,const double radius,
        const double sigma,const long x,const long y,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### radius the radius of the pixel neighborhood. ##### sigma The standard deviation of the Gaussian, in pixels. ##### x, y Define the x and y ellipse offset. ##### exception Return any errors or warnings in this structure. ## WaveImage 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. The format of the WaveImage method is:
      Image *WaveImage(const Image *image,const double amplitude,
        const double wave_length,ExceptionInfo *exception)
A description of each parameter follows: ##### image The image. ##### amplitude, wave_length Define the amplitude and wave length of the sine wave. ##### exception Return any errors or warnings in this structure.

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