Standard Library procedure that converts from the RGB color system to the HSV color system.
green Green color value(s). This parameter must have the same number of elements as the red input parameter.
blue Blue color value(s).
s The corresponding saturation value in the range of 0 to 1.
v The value of the corresponding value in the range 0 to 1.
For background information about color systems, see Understanding Color Systems in Chapter 11 of the PV-WAVE User's Guide.