public static int getCol(int c) {
    int r = (c >> 16) & 0xff;
    int g = (c >> 8) & 0xff;
    int b = (c) & 0xff;

    r = r * 0x55 / 0xff;
    g = g * 0x55 / 0xff;
    b = b * 0x55 / 0xff;

    return r << 16 | g << 8 | b;
}