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Tip of the Day
Language: Java
Expertise: Intermediate
Jul 8, 2008

Create a "Night" Filter Using RGBImageFilter

This following code shows you how to create the "night" effect for an image using the RGBImageFilter:

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>1.0) 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; 
  }
}
Leonard Anghel
 
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