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Converting a Colored Buffered Image to Gray

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);   } }