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| • | Trichromatic
theory – Young and |
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| Helmholtz |
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| – | Receptors for
red, green, blue – color mixing |
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| • | Opponent
Process theory – Hering |
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| – | 3 pairs of
antagonistic colors |
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| – | red/green,
blue/yellow, black/white |
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| • | Current
perspective: both theories |
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| necessary |
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