Microsoft.Xna.Framework.ColorExtensions.GetSaturation C# (CSharp) Method

        public static float GetSaturation(this Color color)
        {
            byte minval = (byte)Math.Min(color.R, Math.Min(color.G, color.B));
            byte maxval = (byte)Math.Max(color.R, Math.Max(color.G, color.B));

            if (maxval == minval)
                return 0.0f;

            int sum = maxval + minval;
            if (sum > 255)
                sum = 510 - sum;

            return (float)(maxval - minval) / sum;
        }