Extend RGBImageFilter ColorFilter class : RGBImageFilter « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. RGBImageFilter

import java.awt.image.RGBImageFilter;

class ColorFilter extends RGBImageFilter {
  boolean red, green, blue;

  public ColorFilter(boolean r, boolean g, boolean b) {
    red = r;
    green = g;
    blue = b;
    canFilterIndexColorModel = true;
  }

  public int filterRGB(int x, int y, int rgb) {
    int r = red ? 0 : ((rgb >> 16) & 0xff);
    int g = green ? 0 : ((rgb >> 8) & 0xff);
    int b = blue ? 0 : ((rgb >> 0) & 0xff);
    return (rgb & 0xff000000) | (r << 16) | (g << 8) | (b << 0);
  }
}