[Chapter 22] ColorModel
Author: John Zukowski
Date: Thu Jul 31 15:24:57 1997

#

| Chapter 22 java.awt.image Reference |

# ColorModel

## Name

ColorModel

##

## Description

The abstract `ColorModel` class defines the way a Java program represents colors. It provides methods for extracting different color components from a pixel.

## Class Definition

    public class java.awt.image.ColorModel
        extends java.lang.Object {
      // Variables
      protected int pixel_bits;
      // Constructors
      public ColorModel (int bits);
      // Class Methods
      public static ColorModel getRGBdefault();
      // Instance Methods
      public void finalize();
      public abstract int getAlpha (int pixel);
      public abstract int getBlue (int pixel);
      public abstract int getGreen (int pixel);
      public int getPixelSize();
      public abstract int getRed (int pixel);
      public int getRGB (int pixel);
    }

## ProtectedVariables

### pixel_bits

#### protected int pixel_bits

The `pixel_bits` variable saves the ColorModel's `bits` setting (the total number of bits per pixel).

## Constructors

### ColorModel

#### public ColorModel (int bits)

Parameters

  bits

    The number of bits required per pixel using this model.

Description

  Constructs a `ColorModel` object.

## Class Methods

### getRGBdefault

#### public static ColorModel getRGBdefault()

Returns

  The default `ColorModel` format, which uses 8 bits for each of a pixel's color components: alpha (transparency), red, green, and blue.

## Instance Methods

### finalize

#### public void finalize()

Overrides

  `Object.finalize()`

Description

  Cleans up when this object is garbage collected.

### getAlpha

#### public abstract int getAlpha (int pixel)

Parameters

  pixel

    A pixel encoded with this `ColorModel`.

Returns

  The current alpha setting of the pixel.

### getBlue

#### public abstract int getBlue (int pixel)

Parameters

  pixel

    A pixel encoded with this `ColorModel`.

Returns

  The current blue setting of the pixel.

### getGreen

#### public abstract int getGreen (int pixel)

Parameters

  pixel

    A pixel encoded with this `ColorModel`.

Returns

  The current green setting of the pixel.

### getPixelSize

#### public int getPixelSize()

Returns

  The current pixel size for the color model.

### getRed

#### public abstract int getRed (int pixel)

Parameters

  pixel

    A pixel encoded with this `ColorModel`.

Returns

  The current red setting of the pixel.

### getRGB

#### public int getRGB (int pixel)

Parameters

  pixel

    A pixel encoded with this `ColorModel`.

Returns

  The current combined red, green, and blue settings of the pixel.

Description

  Gets the color of `pixel` in the default RGB color model.

## See Also

`DirectColorModel`, `IndexColorModel`, `Object`

AreaAveragingScaleFilter |  | CropImageFilter