A 3x3 kernel that sharpens an image.

 
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;

public class Main {
  public static void main(String[] argv) throws Exception {
    BufferedImage bufferedImage = new BufferedImage(200, 200,
        BufferedImage.TYPE_BYTE_INDEXED);

    Kernel kernel = new Kernel(3, 3, new float[] { -1, -1, -1, -1, 9, -1, -1,
        -1, -1 });
    BufferedImageOp op = new ConvolveOp(kernel);
    bufferedImage = op.filter(bufferedImage, null);
  }
}

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A 3x3 kernel that sharpens an image. : Image « Advanced Graphics « Java

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