The Trichromatic theory was proposed in 1802 by Thomas Young.
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The trichromatic theory is strictly true when the visual system is in a fixed state of adaptation.
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In 1801 trichromatic theory, based on the observation that any color could be matched with a combination of three lights.
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:Also see trichromatic theory, which pretty much says the above answer . "'email ) 08 : 19, 7 February 2009 ( UTC)
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There is no need to dismiss the trichromatic theory of vision, but rather it can be enhanced with an understanding of how the visual system adapts to changes in the viewing environment.
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Under the conventional trichromatic theory, a'green'measurement is taken by placing a color filter in front of the light sensor that absorbs'red'and'blue '.
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Ultimately these two theories were synthesized in 1957 by Hurvich and Jameson, who showed that retinal processing corresponds to the trichromatic theory, while processing at the level of the lateral geniculate nucleus corresponds to the opponent theory.
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Thus, trichromatic theory can not explain all afterimage phenomena, indicating the need for an opponent-process theory such as that articulated by Ewald Hering ( 1878 ) and further developed by Hurvich and Jameson ( 1957 ).
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Both Helmholtz's trichromatic theory, and Hering's opponent process theory are therefore correct, but trichromacy arises at the level of the receptors, and opponent processes arise at the level of retinal ganglion cells and beyond.
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Helmholtz, along with Thomas Young, proposed the trichromatic theory, or the Young Helmholtz theory, that stated that the retina contains three types of cones, which respond to light of three different wavelengths, corresponding to red, green, or blue.
