Sharpen

import java.awt.Color;
import java.awt.image.BufferedImage;

@SuppressWarnings("unused")
public class Sharpen implements BaseFilter {
    @Override
    public BufferedImage process(BufferedImage source) {
        BufferedImage slika = new BufferedImage(source.getWidth(), source.getHeight(), BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < source.getWidth(); x++)
        {
            for (int y = 0; y < source.getHeight(); y++)
            {
                slika.setRGB(x, y, source.getRGB(x, y));
            }
        }
        double[][] tabela = {{0, -0.67, 0}, {-0.67, 3.67, -0.67}, {0, -0.67, 0}};
        for (int x = 1; x < source.getWidth() - 1; x++)
        {
            for (int y = 1; y < source.getHeight() - 1; y++)
            {
                int red = 0;
                int green = 0;
                int blue = 0;
                for (int i = -1; i < 2; i++)
                {
                    for (int j = -1; j < 2; j++)
                    {
                        Color c = new Color(source.getRGB(x+j, y+i));
                        red += tabela[i+1][j+1]*c.getRed();
                        green += tabela[i+1][j+1]*c.getGreen();
                        blue += tabela[i+1][j+1]*c.getBlue();
                    }
                }
                if (red < 0)
                    red = 0;
                else if (red > 255)
                    red = 255;
                if (green < 0)
                    green = 0;
                else if (green > 255)
                    green = 255;
                if (blue < 0)
                    blue = 0;
                else if (blue > 255)
                    blue = 255;
                Color c = new Color(red, green, blue);
                int rgb = c.getRGB();
                slika.setRGB(x, y, rgb);
            }
        }
        return slika;
    }

}