Full Idea
In vision three varieties of cones abstract out information according to the amount of light present in various overlapping wavelength ranges. Immediately, many distinctions present in the original light wave are lost.
Gist of Idea
The structure of the retina has already simplified the colour information which hits it
Source
David J.Chalmers (The Conscious Mind [1996], 3.8.3)
Book Reference
Chalmers,David J.: 'The Conscious Mind' [OUP 1997], p.289