Convert a Colored Buffered Image to Gray in Java

   /*w  w w  .  j  av a2 s  .  com*/


import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;

public class Main {
  public static void main(String[] argv) throws Exception {

    ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
    ColorConvertOp op = new ColorConvertOp(cs, null);

    BufferedImage bufferedImage = new BufferedImage(200, 200,
        BufferedImage.TYPE_BYTE_INDEXED);
    bufferedImage = op.filter(bufferedImage, null);
  }
}