public class Color
    {
        public double r, g, b;
 
        public Color(double xr, double xg, double xb)
        {
            r = xr;
            g = xg;
            b = xb;
        }
        public class RGBpercent
        {
            private Color _cl;
            private double rp, gp, bp;
 
            public RGBpercent(Color cl) 
            { 
                _cl = cl;
                rp = _cl.r / 2.55;
                gp = _cl.g / 2.55;
                bp = _cl.b / 2.55;
            }
            public double _rp
            { 
                get {return rp;}
                set {rp = value;}
            } 
        }
        public double rPercent
        {
            get
            {
                RGBpercent me = new RGBpercent(this);
                return me._rp ;
            }
 
            set
            {
                RGBpercent me = new RGBpercent(this);
                me._rp = value;
            }
 
        }
    }

Color.R
Color.G
Color.B
 
Color.H
Color.S
Color.V
 
Color.C
Color.M
...

Color.RGB.R
Color.RGB.G
Color.RGB.B
Color.RGB.Set(r,g,b)
Color.HSV.H
Color.HSV.S
...