ImagePreProcessor.java 文件源码

public BufferedImage getGrayscaledImage(BufferedImage coloredImage) {
    ImageFilter filter = new ImageFilter(){
        public final int filterRGB(int x, int y, int rgb)
        {
            //TODO - optimization? Bit shifts, not this shits
            Color currentColor = new Color(rgb);
            if(currentColor.getRed() < 2 && currentColor.getGreen() < 2 && currentColor.getBlue() < 2) {
                return new Color(rgb).darker().getRGB();
            }

            return Color.WHITE.getRGB();
        }
    };

    ImageProducer producer = new FilteredImageSource(coloredImage.getSource(), filter);
    Image image = Toolkit.getDefaultToolkit().createImage(producer);
    return toBufferedImage(image);
}