private static Bitmap Kutter(Bitmap image, string hash)
        {
            int x = 0;
            for (int y = 0; y < 64; y++)
            {
                Color c = image.GetPixel(x, y);
                byte newB;
                byte r = 2;
                if (hash[y] == '1')
                    newB = (byte)(c.B + 0.1 * r * (0.3 * c.R + 0.59 * c.G + 0.11 * c.B));
                else
                    newB = (byte)(c.B - 0.1 * r * (0.3 * c.R + 0.59 * c.G + 0.11 * c.B));
                image.SetPixel(x, y, Color.FromArgb(c.A, c.R, c.G, newB));
                x++;
            }
            return image;
        }