// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski. Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.image.*;
public class GrayImageFilter extends RGBImageFilter {
public GrayImageFilter () {
canFilterIndexColorModel = true;
}
public int filterRGB (int x, int y, int rgb) {
int gray = (((rgb & 0xff0000) >> 16) +
((rgb & 0x00ff00) >> 8) +
(rgb & 0x0000ff)) / 3;
return (0xff000000 | (gray << 16) | (gray << 8) | gray);
}
}