Discussion
Opponent colour theory holds that colour is encoded as
Answer: D
Correct answer: red against green, yellow against blue, and light against dark
The three cone signals are recombined in the retina into one achromatic and two chromatic opponent channels. The arrangement explains a great deal that trichromacy alone does not: why there are four unique hues rather than three, why no colour is reddish green, and why afterimages and simultaneous contrast take the complementary form they do.
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