NAME

effects - ImageMagick Image Effects Routines

SYNOPSIS

noisy_image=AddNoiseImage(image,noise_type)

blurred_image=BlurImage(image,factor)

despeckled_image=DespeckleImage(image)

edged_image=EdgeImage(image,factor)

embossed_image=EmbossImage(image)

enhanced_image=EnhanceImage(image)

imploded_image=ImplodeImage(image,factor)

painted_image=OilPaintImage(image,radius)

status=PlasmaImage(image,segment_info,attenuate,depth)

RaiseImage(image,raise_info,raised)

noisy_image=ReduceNoiseImage(image)

shaded_image=ShadeImage(image,color_shading,azimuth,elevation)

sharpened_image=SharpenImage(image,factor)

SolarizeImage(image,factor)

spread_image=SpreadImage(image,amount)

swirled_image=SwirlImage(image,degrees)

waved_image=WaveImage(image,amplitude,frequency)

FUNCTION DESCRIPTIONS

AddNoiseImage

Function AddNoiseImage creates a new image that is a copy of an existing one with noise added. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

The format of the AddNoiseImage routine is: 

        noisy_image=AddNoiseImage(image,noise_type)

A description of each parameter follows:

noisy_image:
Function AddNoiseImage returns a pointer to the image after the noise is minified. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

noise_type:
The type of noise: gaussian, multiplicative gaussian, impulse, laplacian, or poisson.

BlurImage

Function BlurImage creates a new image that is a copy of an existing one with the pixels blurred. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

BlurImage convolves the pixel neighborhood with this blurring mask: 

   1  2  1


   2  W  2


   1  2  1

The scan only processes pixels that have a full set of neighbors. Pixels in the top, bottom, left, and right pairs of rows and columns are omitted from the scan.

The format of the BlurImage routine is: 

        blurred_image=BlurImage(image,factor)

A description of each parameter follows:

blurred_image:
Function BlurImage returns a pointer to the image after it is blurred. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

factor:
An double value reflecting the percent weight to give to the center pixel of the neighborhood.

DespeckleImage

Function DespeckleImage creates a new image that is a copy of an existing one with the speckle noise minified. It uses the eight hull algorithm described in Applied Optics, Vol. 24, No. 10, 15 May 1985, ``Geometric filter for Speckle Reduction'', by Thomas R Crimmins. Each pixel in the image is replaced by one of its eight of its surrounding pixels using a polarity and negative hull function. DespeckleImage allocates the memory necessary for the new Image structure and returns a pointer to the new image.

The format of the DespeckleImage routine is: 

        despeckled_image=DespeckleImage(image)

A description of each parameter follows:

despeckled_image:
Function DespeckleImage returns a pointer to the image after it is despeckled. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

EdgeImage

Function EdgeImage creates a new image that is a copy of an existing one with the edges highlighted. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

EdgeImage convolves the pixel neighborhood with this edge detection mask: 

  -1  0 -1


   0  W  0


  -1  0 -1

The scan only processes pixels that have a full set of neighbors. Pixels in the top, bottom, left, and right pairs of rows and columns are omitted from the scan.

The format of the EdgeImage routine is: 

        edged_image=EdgeImage(image,factor)

A description of each parameter follows:

edged_image:
Function EdgeImage returns a pointer to the image after it is edged. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

factor:
An double value reflecting the percent weight to give to the center pixel of the neighborhood.

EmbossImage

Function EmbossImage 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.

EmbossImage convolves the pixel neighborhood with this edge detection mask: 

  -1 -2  0


  -2  0  2


   0  2  1

The scan only processes pixels that have a full set of neighbors. Pixels in the top, bottom, left, and right pairs of rows and columns are omitted from the scan.

The format of the EmbossImage routine is: 

        embossed_image=EmbossImage(image)

A description of each parameter follows:

embossed_image:
Function EmbossImage returns a pointer to the image after it is embossed. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

EnhanceImage

Function EnhanceImage creates a new image that is a copy of an existing one with the noise minified. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

EnhanceImage does a weighted average of pixels in a 5x5 cell around each target pixel. Only pixels in the 5x5 cell that are within a RGB distance threshold of the target pixel are averaged.

Weights assume that the importance of neighboring pixels is negately proportional to the square of their distance from the target pixel.

The scan only processes pixels that have a full set of neighbors. Pixels in the top, bottom, left, and right pairs of rows and columns are omitted from the scan.

The format of the EnhanceImage routine is: 

        enhanced_image=EnhanceImage(image)

A description of each parameter follows:

enhanced_image:
Function EnhanceImage returns a pointer to the image after it is enhanced. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

ImplodeImage

Function ImplodeImage creates a new image that is a copy of an existing one with the image pixels ``imploded'' 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 routine is: 

        imploded_image=ImplodeImage(image,factor)

A description of each parameter follows:

imploded_image:
Function ImplodeImage returns a pointer to the image after it is imploded. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

factor:
An double value that defines the extent of the implosion.

OilPaintImage

Function OilPaintImage creates a new image that is a copy of an existing one with each pixel component replaced with the color of greatest frequency in a circular neighborhood.

The format of the OilPaintImage routine is: 

        painted_image=OilPaintImage(image,radius)

A description of each parameter follows:

painted_image:
Function OilPaintImage returns a pointer to the image after it is `painted'. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

radius:
An unsigned int that is the radius of the circular neighborhood.

PlasmaImage

Function 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 routine is called.

The format of the PlasmaImage routine is: 

        status=PlasmaImage(image,segment_info,attenuate,depth)

A description of each parameter follows:

status:
Function PlasmaImage returns True when the fractal process is complete. Otherwise False is returned.

image:
The address of a structure of type Image; returned from ReadImage.

segment_info:
specifies a structure of type SegmentInfo that defines the boundaries of the area where the plasma fractals are applied.

attenuate:
specifies the plasma attentuation factor.

depth:
this integer values define the plasma recursion depth.

RaiseImage

Function RaiseImage lightens and darkens the edges of an image to give a 3-D raised or lower effect.

The format of the RaiseImage routine is: 

        RaiseImage(image,raise_info,raised)

A description of each parameter follows:

image:
The address of a structure of type Image.

raise_info:
Specifies a pointer to a XRectangle which defines the raised region.

raised:
A value other than zero causes the image to have a 3-D raised effect, otherwise it has a lowered effect.

ReduceNoiseImage

Function ReduceNoiseImage creates a new image that is a copy of an existing one with the noise minified with a noise peak elimination filter. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

The principal function of noise peak elimination filter is to smooth the objects within an image without losing edge information and without creating undesired structures. The central idea of the algorithm is to replace a pixel with its next neighbor in value within a 3 x 3 window, if this pixel has been found to be noise. A pixel is defined as noise if and only if this pixel is a maximum or minimum within the 3 x 3 window.

The format of the ReduceNoiseImage routine is: 

        noisy_image=ReduceNoiseImage(image)

A description of each parameter follows:

noisy_image:
Function ReduceNoiseImage returns a pointer to the image after the noise is minified. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

ShadeImage

Function ShadeImage creates a new image that is a copy of an existing one with the image pixels shaded using a distance light source. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

The format of the ShadeImage routine is: 

        shaded_image=ShadeImage(image,color_shading,azimuth,elevation)

A description of each parameter follows:

shaded_image:
Function ShadeImage returns a pointer to the image after it is shaded. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

color_shading:
A value other than zero shades the red, green, and blue components of the image.

azimuth, elevation:
A double value that indicates the light source direction.

SharpenImage

Function SharpenImage creates a new image that is a copy of an existing one with the pixels sharpened. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

SharpenImage convolves the pixel neighborhood with this sharpening mask: 

  -1 -2 -1


  -2  W -2


  -1 -2 -1

The scan only processes pixels that have a full set of neighbors. Pixels in the top, bottom, left, and right pairs of rows and columns are omitted from the scan.

The format of the SharpenImage routine is: 

        sharpened_image=SharpenImage(image,factor)

A description of each parameter follows:

sharpened_image:
Function SharpenImage returns a pointer to the image after it is sharpened. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

factor:
An double value reflecting the percent weight to give to the center pixel of the neighborhood.

SolarizeImage

Function SolarizeImage produces a 'solarization' effect seen when exposing a photographic film to light during the development process.

The format of the SolarizeImage routine is: 

        SolarizeImage(image,factor)

A description of each parameter follows:

image:
The address of a structure of type Image; returned from ReadImage.

factor:
An double value that defines the extent of the solarization.

SpreadImage

Function SpreadImage creates a new image that is a copy of an existing one with the image pixels randomly displaced. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

The format of the SpreadImage routine is: 

        spread_image=SpreadImage(image,amount)

A description of each parameter follows:

spread_image:
Function SpreadImage returns a pointer to the image after it is spread. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

amount:
An unsigned value constraining the ``vicintity'' for choosing a random pixel to swap.

SwirlImage

Function SwirlImage creates a new image that is a copy of an existing one with the image pixels ``swirled'' at a specified angle. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

The format of the SwirlImage routine is: 

        swirled_image=SwirlImage(image,degrees)

A description of each parameter follows:

swirled_image:
Function SwirlImage returns a pointer to the image after it is swirled. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

degrees:
An double value that defines the tightness of the swirling.

WaveImage

Function WaveImage creates a new image that is a copy of an existing one with the image pixels altered along a sine wave. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.

The format of the WaveImage routine is: 

        waved_image=WaveImage(image,amplitude,frequency)

A description of each parameter follows:

shaded_image:
Function WaveImage returns a pointer to the image after it is shaded. A null image is returned if there is a memory shortage.

image:
The address of a structure of type Image; returned from ReadImage.

amplitude, frequency:
A double value that indicates the amplitude and wavelength of the sine wave.