[BufferedImage] 이미지 이진화(Image Binarize)

private void binarize(BufferedImage image) {
    for (int i = 0; i < image.getWidth(); i++)
        for (int j = 0; j < image.getHeight(); j++)
            image.setRGB(i, j, gamma(image.getRGB(i, j)) > 127 ? Color.white.getRGB() : Color.black.getRGB());
}
private int gamma(int rgb) {
    return (red(rgb) + green(rgb) + blue(rgb)) / 3;
}
private int red(int rgb) {
    return (rgb >> 16) & 0x000000FF;
}
private int green(int rgb) {
    return (rgb >> 8) & 0x000000FF;
}
private int blue(int rgb) {
    return (rgb) & 0x000000FF;
}