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[ CharcoalImage | ColorizeImage | ConvolveImage | EvaluateImage | FxImage | ImplodeImage | The MorphImages | OilPaintImage | MagickSepiaToneImage | ShadowImage | SolarizeImage | SteganoImage | StereoImage | SwirlImage | TintImage | VignetteImage | WaveImage ]
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.
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() 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() 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 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() 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.
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 retuns 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.
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.
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() 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 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() 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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