color

Hi Kees!

>This ends the controversy about which three colors are 'the' primary colors
>(red,green,blue) or (red, yellow,blue), because human vision is opponent
>based on four primary colors, being two pairs of complimentaries.

This may be true on the psychological level, but at the purely physical
level it is clear that the primary colors would be defined by your first
statement:

>There are three types of (color sensitive) cones in the retina. These have
>single peaks in their wavelength sensitivity. They are mostly referred to
as
>L, M and S (for long- middle- and short wavelength sensitivity. The peaks
>are aprx. at 580, 540 and 440 nm.

. . . which is what you need to know if you're designing a monitor or a set
of printing inks.

Back to music . . .