PSYC 212 Lecture 9: Lecture 9
6 Nov 2018
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Document Summary
Nonspectral hues: hues that can arise only from mixtures of wavelengths, i. e. there is no "purple" in the spectrum, it has to come from a particular combination of activity across s, m and l cones. Opponent colour theory: the theory that perception of colour depends on the output of three mechanisms, each of them based on an opponency between two colours: red-green, blue-yellow, and black-white. Ewald hering (1834-1918) noticed that some colour combinations are "legal" while others are "illegal" We can have bluish green (cyan), reddish yellow (orange), or bluish red (purple) We cannot have reddish green or bluish yellow. Start with a colour, such as bluish green. The goal is to end up with pure blue. Shine some red light to cancel out the green light. Adjust the intensity of the red light until there is no sign of either green or red in the blue patch.
