Package com.twelvemonkeys.image

Class InverseColorMap

  • class InverseColorMap
extends java.lang.Object
    Inverse Colormap to provide efficient lookup of any given input color to the closest match to the given color map.

    Based on "Efficient Inverse Color Map Computation" by Spencer W. Thomas in "Graphics Gems Volume II".

    Version:
    $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/image/InverseColorMap.java#1 $

    • Field Summary

      Fields 
      Modifier and Type Field Description
      (package private) byte[] inverseRGB  
      (package private) int maxColor  
      (package private) static int MAXQUANTVAL
      Maximum value a quantised color channel can have
      (package private) int numColors  
      (package private) static int QUANTBITS
      Number of high bits of each color channel to use to lookup near match
      (package private) static int QUANTMASK_BLUE
      BITMASK representing the bits for blue in the color lookup
      (package private) static int QUANTMASK_GREEN
      BITMASK representing the bits for green in the color lookup
      (package private) static int QUANTMASK_RED
      BITMASK representing the bits for red in the color lookup
      (package private) byte[] rgbMapByte  
      (package private) int[] rgbMapInt  
      (package private) int transparentIndex  
      (package private) static int TRUNCBITS
      Truncated bits of each color channel

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int getIndexNearest​(int pColor)
      Gets the index of the nearest color to from the color map.
      int getIndexNearest​(int pRed, int pGreen, int pBlue)
      Gets the index of the nearest color to from the color map.
      (package private) void initIRGB​(int[] pTemp)
      Simple inverse color table creation method.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • QUANTBITS

        static final int QUANTBITS
        Number of high bits of each color channel to use to lookup near match
        See Also:
        Constant Field Values

      • TRUNCBITS

        static final int TRUNCBITS
        Truncated bits of each color channel
        See Also:
        Constant Field Values

      • QUANTMASK_BLUE

        static final int QUANTMASK_BLUE
        BITMASK representing the bits for blue in the color lookup
        See Also:
        Constant Field Values

      • QUANTMASK_GREEN

        static final int QUANTMASK_GREEN
        BITMASK representing the bits for green in the color lookup
        See Also:
        Constant Field Values

      • QUANTMASK_RED

        static final int QUANTMASK_RED
        BITMASK representing the bits for red in the color lookup
        See Also:
        Constant Field Values

      • MAXQUANTVAL

        static final int MAXQUANTVAL
        Maximum value a quantised color channel can have
        See Also:
        Constant Field Values

      • rgbMapByte

        byte[] rgbMapByte

      • rgbMapInt

        int[] rgbMapInt

      • numColors

        int numColors

      • maxColor

        int maxColor

      • inverseRGB

        byte[] inverseRGB

      • transparentIndex

        int transparentIndex

    • Constructor Detail

      • InverseColorMap

        InverseColorMap​(byte[] pRGBColorMap)
        Parameters:
        pRGBColorMap - the rgb color map to create inverse color map for.

      • InverseColorMap

        InverseColorMap​(int[] pRGBColorMap)
        Parameters:
        pRGBColorMap - the rgb color map to create inverse color map for.

      • InverseColorMap

        InverseColorMap​(byte[] pRGBColorMap,
                int pTransparent)
        Parameters:
        pRGBColorMap - the rgb color map to create inverse color map for.
        pTransparent - the index of the transparent pixel in the map

      • InverseColorMap

        InverseColorMap​(int[] pRGBColorMap,
                int pTransparent)
        Parameters:
        pRGBColorMap - the rgb color map to create inverse color map for.
        pTransparent - the index of the transparent pixel in the map

    • Method Detail

      • initIRGB

        void initIRGB​(int[] pTemp)
        Simple inverse color table creation method.
        Parameters:
        pTemp - temp array

      • getIndexNearest

        public final int getIndexNearest​(int pColor)
        Gets the index of the nearest color to from the color map.
        Parameters:
        pColor - the color to get the nearest color to from color map color must be of format 0x00RRGGBB - standard default RGB
        Returns:
        index of color which closest matches input color by using the created inverse color map.

      • getIndexNearest

        public final int getIndexNearest​(int pRed,
                                 int pGreen,
                                 int pBlue)
        Gets the index of the nearest color to from the color map.
        Parameters:
        pRed - red component of the color to get the nearest color to from color map
        pGreen - green component of the color to get the nearest color to from color map
        pBlue - blue component of the color to get the nearest color to from color map
        Returns:
        index of color which closest matches input color by using the created inverse color map.