Will W wrote:
> One thing I don't understand, though, is the way some of the wedges show
> pronounced variations from the center outward. Especially noticeable in
> red-white-red and red-green-red. Does this have something to do with the
> placement of the light source?

the light source is placed at the exact centre of the wheel, providing
the same illuminative properties to each wedge.  the red/*/red areas
are unique in the amount they increase the light that passes through
them, because they are scattering rgb -0.5 AND absorbing rbg -0.5.
what sets those three pieces apart from each other is the emission
value; green is emitting rgb 0.5, white nothing, red emitting rgb -0.5.

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

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