RGB平均値による２値化 | Codetter（こーどったー）

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/* ２値化のしきい値 */
public static final double THRESHOLD = 255 / 2.0;
/* ２値化のサンプル */
private static void doProcess() {
    for (int x = 0; x < image.getWidth(); x++) {
        for (int y = 0; y < image.getHeight(); y++) {
            int rgb = image.getRGB(x, y);
            double rgbAverage = getRGBAverage(rgb);
            
            if (rgbAverage <= THRESHOLD) {
                image.setRGB(x, y, 0x00FFFFFF); //しきい値以下なら白
            } else {
                image.setRGB(x, y, 0x00000000); //しきい値より大きければ黒
            }
        }
    }
}
/* rgb各成分の平均値 */
private static double getRGBAverage(int rgb) {
    int r = (rgb & 0x00FF0000) >> 16;
    int g = (rgb & 0x0000FF00) >> 8;
    int b = (rgb & 0x000000FF);
    return (r + g + b) / 3.0;
}
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