import java.awt.image.RGBImageFilter;
class AlphaFilter extends RGBImageFilter {
int alphaLevel;
public AlphaFilter(int alpha) {
alphaLevel = alpha;
canFilterIndexColorModel = true;
}
public int filterRGB(int x, int y, int rgb) {
int alpha = (rgb >> 24) & 0xff;
alpha = (alpha * alphaLevel) / 255;
return ((rgb & 0x00ffffff) | (alpha << 24));
}
}