




A hue component.
A saturation component.
A value component.
A number between 0 and 1, or nil.
Return a color-spec in the :HSV model with components 
hue
, 
saturation
 and 
value
. 
Note that short-floats are used for each component; this results in the most efficient color conversion process. However, any floating-point number type can be used.
alpha 
indicates the alpha value of the color. 0 means it is transparent, 1 means it is solid.  If 
alpha
 is nil or not specified then the color does not have an alpha component and it is assumed to be solid.
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017