This example demonstrates a 3x3 kernel that sharpens an image.
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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