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Create the “Night” Filter Using the RGBImageFilter Class

Create the “Night” Filter Using the RGBImageFilter Class

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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