public OzGrayscale(
	double cr = 0,2125,
	double cg = 0,7154,
	double cb = 0,0721
)

Public Sub New ( 
	Optional cr As Double = 0,2125,
	Optional cg As Double = 0,7154,
	Optional cb As Double = 0,0721
)

public:
OzGrayscale(
	double cr = 0,2125, 
	double cg = 0,7154, 
	double cb = 0,0721
)

new : 
        ?cr : float * 
        ?cg : float * 
        ?cb : float 
(* Defaults:
        let _cr = defaultArg cr 0,2125
        let _cg = defaultArg cg 0,7154
        let _cb = defaultArg cb 0,0721
*)
-> OzGrayscale