ImageMagick: MagickCore, C API for ImageMagick: Add a Special Effect

AddNoiseImage • BlueShiftImage • CharcoalImage • ColorizeImage • ColorMatrixImage • FxImage • ImplodeImage • The MorphImages • PlasmaImage • PolaroidImage • MagickSepiaToneImage • ShadowImage • SketchImage • SolarizeImage • SteganoImage • StereoAnaglyphImage • SwirlImage • TintImage • VignetteImage • WaveImage • WaveletDenoiseImage

AddNoiseImage

AddNoiseImage() adds random noise to the image.

The format of the AddNoiseImage method is:

Image *AddNoiseImage(const Image *image,const NoiseType noise_type,
  const double attenuate,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.
attenuate: attenuate the random distribution.
exception: return any errors or warnings in this structure.

BlueShiftImage

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

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 *blend,
  const PixelInfo *colorize,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
blend: A character string indicating the level of blending as a percentage.
colorize: A color value.
exception: return any errors or warnings in this structure.

ColorMatrixImage

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

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)

A description of each parameter follows:

image: the image.
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,
  const PixelInterpolateMethod method,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.
method: the pixel interpolation method.
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 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

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,ExceptionInfo *exception)

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.
exception: return any errors or warnings in this structure.

PolaroidImage

PolaroidImage() simulates a Polaroid picture.

The format of the PolaroidImage method is:

Image *PolaroidImage(const Image *image,const DrawInfo *draw_info,
  const char *caption,const double angle,
  const PixelInterpolateMethod method,ExceptionInfo exception)

A description of each parameter follows:

image: the image.
draw_info: the draw info.
caption: the Polaroid caption.
angle: Apply the effect along this angle.
method: the pixel interpolation method.
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 alpha,
  const double sigma,const ssize_t x_offset,const ssize_t y_offset,
  ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
alpha: 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,
  ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
threshold: Define the extent of the solarization.
exception: return any errors or warnings in this structure.

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.

StereoAnaglyphImage

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

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,
  const PixelInterpolateMethod method,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
degrees: Define the tightness of the swirling effect.
method: the pixel interpolation method.
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 *blend,
  const PixelInfo *tint,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
blend: 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 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

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,const PixelInterpolateMethod method,
  ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
amplitude, wave_length: Define the amplitude and wave length of the sine wave.
interpolate: the pixel interpolation method.
exception: return any errors or warnings in this structure.

WaveletDenoiseImage

WaveletDenoiseImage() removes noise from the image using a wavelet transform. The wavelet transform is a fast hierarchical scheme for processing an image using a set of consecutive lowpass and high_pass filters, followed by a decimation. This results in a decomposition into different scales which can be regarded as different “frequency bands”, determined by the mother wavelet. Adapted from dcraw.c by David Coffin.

The format of the WaveletDenoiseImage method is:

Image *WaveletDenoiseImage(const Image *image,const double threshold,
  const double softness,ExceptionInfo *exception)

A description of each parameter follows:

image: the image.
threshold: set the threshold for smoothing.
softness: attenuate the smoothing threshold.
exception: return any errors or warnings in this structure.