com.jhlabs.image

Interface Quantizer

All Known Implementing Classes:

OctTreeQuantizer

public interface Quantizer

The interface for an image quantizer. The addColor method is called (repeatedly if necessary) with all the image pixels. A color table can then be returned by calling the buildColorTable method.

Method Summary

Modifier and Type	Method and Description
void	addPixels(int[] pixels, int offset, int count) Add pixels to the quantizer.
int[]	buildColorTable() Build a color table from the added pixels.
int	getIndexForColor(int rgb) Using the previously-built color table, return the index into that table for a pixel.
void	setup(int numColors) Initialize the quantizer.

Method Detail

setup

void setup(int numColors)

Initialize the quantizer. This should be called before adding any pixels.

Parameters:

numColors - the number of colors we're quantizing to.

addPixels

void addPixels(int[] pixels,
               int offset,
               int count)

Add pixels to the quantizer.

Parameters:

pixels - the array of ARGB pixels

offset - the offset into the array

count - the count of pixels

buildColorTable

int[] buildColorTable()

Build a color table from the added pixels.

Returns:

an array of ARGB pixels representing a color table

getIndexForColor

int getIndexForColor(int rgb)

Using the previously-built color table, return the index into that table for a pixel. This is guaranteed to return a valid index - returning the index of a color closer to that requested if necessary.

Parameters:

rgb - the pixel to find

Returns:

the pixel's index in the color table