Field Detail

• DEFAULT_PALETTE_SIZE

  public static final int DEFAULT_PALETTE_SIZE

  The default number of colors in the palette. Will be used when no other value is specified via setPaletteSize(int).

  See Also:

  Constant Field Values

• paletteSize

  private int paletteSize

• root

  private OctreeNode root

• palette

  private Palette palette

• redValues

  private int[] redValues

• greenValues

  private int[] greenValues

• blueValues

  private int[] blueValues

Constructor Detail

• OctreeColorQuantizer

  public OctreeColorQuantizer()

Method Detail

• assignPaletteIndexValues

  private int assignPaletteIndexValues​(OctreeNode node,
                                       int index)

  If node is a leaf node, this method assigns palette index values and determines the representative color, otherwise it simply recursively calls itself for all child nodes. The updated index value is returned. It is increased whenever a leaf is assigned that index value.

  Parameters:

  node - the node of the octree that will itself (and its children) be processed

  index - the current index in the palette index assignment procedure

  Returns:

  updated index value; may have been increased while node or its child(ren) - were assigned index values

• createPalette

  public Palette createPalette()

  Description copied from interface: RGBQuantizer
  Return a Palette object with the list of colors to be used in the quantization process. That palette may be fixed or created specifically for a given input image.

  Specified by:

  createPalette in interface RGBQuantizer

  Returns:

  Palette object for destination image

• init

  public void init()
            throws MissingParameterException,
                   WrongParameterException

  Creates an octree and prepares this quantizer so that colors can be mapped to palette index values. If you use process() you must not call this method. On the other hand, if you want to do the mapping yourself - maybe if you want to do mapping and dithering interchangeably - call this method first, then do the mapping yourself.

  Throws:

  MissingParameterException - if parameters like the input image are missing

  WrongParameterException - if parameters exist but are of the wrong type

• initOctree

  private int initOctree()

• initPalette

  private void initPalette​(OctreeNode node,
                           Palette palette)

• map

  public int map​(int[] origRgb,
                 int[] quantizedRgb)

  Maps an RGB color origRgb to one of the colors in the color map; that color will be written to quantizedRgb and its palette index will be returned.

  Specified by:

  map in interface RGBQuantizer

  Parameters:

  origRgb - the color to be mapped to the best-possible counterpart in the palette; the array is indexed by the constants from RGBIndex

  quantizedRgb - the resulting color from the palette will be written to this array; it is also indexed by the constants from RGBIndex

  Returns:

  index of the found color in the palette

• mapImage

  private void mapImage()

• process

  public void process()
               throws MissingParameterException,
                      WrongParameterException

  Initializes an octree, reduces it have as many leaves (or less) as the desired palette size and maps the original image to the newly-created palette.

  Overrides:

  process in class Operation

  Throws:

  MissingParameterException - if any mandatory parameter was not given to the operation

  WrongParameterException - if at least one of the input parameters was not initialized appropriately (values out of the valid interval, etc.)

• pruneOctree

  private void pruneOctree()

  Reduces the octree until it has as many leaves (or less) than specified by the paletteSize argument in the constructor #OctreeColorQuantizer(int).

• setPaletteSize

  public void setPaletteSize​(int newPaletteSize)