Many Frequencies –> Three Signals (~RGB)
nAll frequencies modulated by Red-, Green-, and Blue-sensitive cones. nNot co-incidence that RGB are additive color primaries…
n
http://www.colorado.edu/ASEN/asen5519/17light.htm
http://www.cs.brown.edu/exploratories/freeSoftware/catalogs/color_theory.html
You can play with this software yourself…

Making a wide range of colors out of only three “primary” ones, a theme throughout color theory and

 very important for digital color: all color on the computer described in terms of amounts of RG&B (in code and screen phosphors) or CMY (K) for printing…