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Create the “Night” Filter Using the RGBImageFilter Class

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The following code uses the RGBImageFilter class to create the “night” effect on an image:

import java.awt.image.*;public class NightFilter extends RGBImageFilter { double frac;  //0.0<=g<=1.0  public NightFilter(double g) {    frac=g;  }  public int filterRGB(int x, int y, int rgb) {    if (frac<=0) return 0xFF000000;    if (frac&gt1.0) return 0xFF000000;    int red=rgb & 0x00FF0000;red>>>=16;    int green=rgb & 0x0000FF00;green>>>=8;    int blue=rgb & 0x0000FF;        int r=(int) (red*frac);    int g=(int) (green*frac);    int b=(int) (blue*frac);        return (0x000000FF<<24) | (r <<16) | (g << 8) | b;   }}

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