com.sun.jimi.core.util
Class GrayscaleColorModel

java.lang.Object
  |
  +--java.awt.image.ColorModel
        |
        +--com.sun.jimi.core.util.GrayscaleColorModel

public class GrayscaleColorModel

extends java.awt.image.ColorModel

ColorModel for grayscale images. Allows for pixels of a given bit depth to directly represent a grayscale value.

Possible future optimisation might include a generated internal lookup table to make the individual get methods more efficient.

This class is flexible in that it can be used for black and white images and any bit depth grayscale image from 1 to 8 bits in depth.

Examples of use:

• Black and White image where pixels of value 0 are white
  new GrayscaleColorModel(true, 1);
• Common usage case for 8 bit depth grayscale image
  new GrayscaleColorModel(true);

Fields inherited from class java.awt.image.ColorModel

pixel_bits, transferType

Constructor Summary

GrayscaleColorModel(boolean zeroIsWhite)
Constructs a GrayColorModel.

GrayscaleColorModel(boolean zeroIsWhite, int pixelSize)

Method Summary

int	getAlpha(int pixel)
int	getBlue(int pixel)
int	getGreen(int pixel)
int	getRed(int pixel)
int	getRGB(int pixel) Returns the color of the pixel in the default RGB color model.
boolean	getZeroIsWhite()
protected void	init(boolean zeroIsWhite)

Methods inherited from class java.awt.image.ColorModel

coerceData, createCompatibleSampleModel, createCompatibleWritableRaster, equals, finalize, getAlpha, getAlphaRaster, getBlue, getColorSpace, getComponents, getComponents, getComponentSize, getComponentSize, getDataElement, getDataElements, getDataElements, getGreen, getNormalizedComponents, getNumColorComponents, getNumComponents, getPixelSize, getRed, getRGB, getRGBdefault, getTransparency, getUnnormalizedComponents, hasAlpha, isAlphaPremultiplied, isCompatibleRaster, isCompatibleSampleModel, toString

Methods inherited from class java.lang.Object

clone, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

GrayscaleColorModel

public GrayscaleColorModel(boolean zeroIsWhite)

Constructs a GrayColorModel. Pixels described by this color model will all have alpha components of 255 (fully opaque). This colormodel is similar to IndexColorModel except the palette is fixed to scales of grey from black to white. This constructor set pixel size to 8 and color component arrays of size 256.

Parameters:

zeroIsWhite - Flag if set means that a pixel of value of 0 return the color white. Else value pixel value 0 returns black.

GrayscaleColorModel

public GrayscaleColorModel(boolean zeroIsWhite,
                           int pixelSize)

Parameters:

zeroIsWhite - Flag if set means that a pixel of value of 0 return the color white

pixelSize - range of values 1 to 8 bits only.

Method Detail

getZeroIsWhite

public boolean getZeroIsWhite()

Returns:

the flag indicating if ZeroIsWhite for this ColorModel. If returns false then Zero is Black for this ColorModel.

init

protected void init(boolean zeroIsWhite)

Parameters:

zeroIsWhite - Flag if set means that a pixel of value of 0 return the color white transition between. If not set then colour transition reversed.

getRed

public int getRed(int pixel)

Parameters:

pixel - The pixel to lookup value for. For this colour model the pixel can only range between 0 and (2 ^ pixelDepth) - 1)

Returns:

the red color compoment for the specified pixel in the range 0-255.

Overrides:

getRed in class java.awt.image.ColorModel

getGreen

public int getGreen(int pixel)

Parameters:

pixel - The pixel to lookup value for. For this colour model the pixel can only range between 0 and 255.

Returns:

the green color compoment for the specified pixel in the range 0-255.

Overrides:

getGreen in class java.awt.image.ColorModel

getBlue

public int getBlue(int pixel)

Parameters:

pixel - The pixel to lookup value for. For this colour model the pixel can only range between 0 and 255.

Returns:

the blue color compoment for the specified pixel in the range 0-255.

Overrides:

getBlue in class java.awt.image.ColorModel

getAlpha

public int getAlpha(int pixel)

Parameters:

pixel - The pixel to lookup value for. For this colour model the pixel can only range between 0 and 255.

Returns:

the alpha compoment for the specified pixel in the range 0-255.

Overrides:

getAlpha in class java.awt.image.ColorModel

getRGB

public int getRGB(int pixel)

Returns the color of the pixel in the default RGB color model.

Overrides:

getRGB in class java.awt.image.ColorModel

See Also:

ColorModel.getRGBdefault()