Module fx Methods

AddNoiseImage() adds random noise to the image.

The format of the AddNoiseImage method is:

  Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
    ExceptionInfo *exception)
  Image *AddNoiseImageChannel(const Image *image,const ChannelType channel,
    const NoiseType noise_type,ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

channel

the channel type.

noise_type

The type of noise: Uniform, Gaussian, Multiplicative, Impulse, Laplacian, or Poisson.

exception

return any errors or warnings in this structure.

BlueShiftImage() mutes the colors of the image to simulate a scene at nighttime in the moonlight.

The format of the BlueShiftImage method is:

  Image *BlueShiftImage(const Image *image,const double factor,
    ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

factor

the shift factor.

exception

return any errors or warnings in this structure.

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() 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.

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).

The format of the ColorMatrixImage method is:

  Image *ColorMatrixImage(const Image *image,
    const KernelInfo *color_matrix,ExceptionInfo *exception)

A description of each parameter follows:

image

the image.

color_matrix

the color matrix.

exception

return any errors or warnings in this structure.

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() 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() 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 size_t 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.

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.

The format of the PlasmaImage method is:

  MagickBooleanType PlasmaImage(Image *image,const SegmentInfo *segment,
    size_t attenuate,size_t depth)

A description of each parameter follows:

image

the image.

segment

Define the region to apply plasma fractals values.

attenuate

Define the plasma attenuation factor.

depth

Limit the plasma recursion depth.

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.

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() 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 ssize_t x_offset,const ssize_t 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() 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() 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() 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.

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.

The format of the StereoAnaglyphImage method is:

  Image *StereoImage(const Image *left_image,const Image *right_image,
    ExceptionInfo *exception)
  Image *StereoAnaglyphImage(const Image *left_image,
    const Image *right_image,const ssize_t x_offset,const ssize_t y_offset,
    ExceptionInfo *exception)

A description of each parameter follows:

left_image

the left image.

right_image

the right image.

exception

return any errors or warnings in this structure.

x_offset

amount, in pixels, by which the left image is offset to the right of the right image.

y_offset

amount, in pixels, by which the left image is offset to the bottom of the right image.

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() 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() 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 ssize_t x,const ssize_t 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() 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.