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## org.apache.fop.util.bitmap
Class DitherUtil

    java.lang.Object
      org.apache.fop.util.bitmap.DitherUtil

    public final class DitherUtil

extends java.lang.Object

Utility methods for dithering.

Field Summary
`static int` | `DITHER_MATRIX_2X2` Selects a 2x2 Bayer dither matrix (5 grayscales)
`static int` | `DITHER_MATRIX_4X4` Selects a 4x4 Bayer dither matrix (17 grayscales)
`static int` | `DITHER_MATRIX_8X8` Selects a 8x8 Bayer dither matrix (65 grayscales)

Method Summary
`static int[]` | `getBayerBasePattern(int matrix)` Returns the Bayer dither base pattern for a particular matrix size.
`static byte[]` | `getBayerDither(int matrix, java.awt.Color col, boolean doubleMatrix)` Returns a byte array containing the dither pattern for the given 8-bit gray value.
`static byte[]` | `getBayerDither(int matrix, int gray255, boolean doubleMatrix)` Returns a byte array containing the dither pattern for the given 8-bit gray value.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DITHER_MATRIX_2X2

    public static final int DITHER_MATRIX_2X2

  Selects a 2x2 Bayer dither matrix (5 grayscales)

  See Also:
    Constant Field Values

### DITHER_MATRIX_4X4

    public static final int DITHER_MATRIX_4X4

  Selects a 4x4 Bayer dither matrix (17 grayscales)

  See Also:
    Constant Field Values

### DITHER_MATRIX_8X8

    public static final int DITHER_MATRIX_8X8

  Selects a 8x8 Bayer dither matrix (65 grayscales)

  See Also:
    Constant Field Values

Method Detail

### getBayerBasePattern

    public static int[] getBayerBasePattern(int matrix)

  Returns the Bayer dither base pattern for a particular matrix size.

  Parameters:
    `matrix` - the matrix size (`DITHER_MATRIX_2X2`, `DITHER_MATRIX_4X4` or `DITHER_MATRIX_8X8`)
  Returns:
    the base pattern for the given size

### getBayerDither

    public static byte[] getBayerDither(int matrix,
                                        int gray255,
                                        boolean doubleMatrix)

  Returns a byte array containing the dither pattern for the given 8-bit gray value.

  Parameters:
    `matrix` - the matrix size (`DITHER_MATRIX_2X2`, `DITHER_MATRIX_4X4` or `DITHER_MATRIX_8X8`)
    `gray255` - the gray value (0-255)
    `doubleMatrix` - true if the 4x4 matrix shall be doubled to a 8x8
  Returns:
    the dither pattern

### getBayerDither

    public static byte[] getBayerDither(int matrix,
                                        java.awt.Color col,
                                        boolean doubleMatrix)

  Returns a byte array containing the dither pattern for the given 8-bit gray value.

  Parameters:
    `matrix` - the matrix size (`DITHER_MATRIX_2X2`, `DITHER_MATRIX_4X4` or `DITHER_MATRIX_8X8`)
    `col` - the color
    `doubleMatrix` - true if the 4x4 matrix shall be doubled to a 8x8
  Returns:
    the dither pattern

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