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  2. Young–Helmholtz theory - Wikipedia

    en.wikipedia.org/wiki/Young–Helmholtz_theory

    Thomas Young and Hermann von Helmholtz assumed that the eye's retina consists of three different kinds of light receptors for red, green and blue.. The Young–Helmholtz theory (based on the work of Thomas Young and Hermann von Helmholtz in the 19th century), also known as the trichromatic theory, is a theory of trichromatic color vision – the manner in which the visual system gives rise to ...

  3. Trichromacy - Wikipedia

    en.wikipedia.org/wiki/Trichromacy

    Trichromatic color vision is the ability of humans and some other animals to see different colors, mediated by interactions among three types of color-sensing cone cells. The trichromatic color theory began in the 18th century, when Thomas Young proposed that color vision was a result of three different photoreceptor cells .

  4. Color - Wikipedia

    en.wikipedia.org/wiki/Color

    The trichromatic theory is strictly true when the visual system is in a fixed state of adaptation. [33] In reality, the visual system is constantly adapting to changes in the environment and compares the various colors in a scene to reduce the effects of the illumination.

  5. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    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. In Hering's theory, opponent mechanisms refer to the opposing color effect of red–green, blue–yellow, and light ...

  6. Unique hues - Wikipedia

    en.wikipedia.org/wiki/Unique_hues

    While this theory with 4 unique hues was initially considered contradictory to the Young-Helmholtz trichromatic theory's three primary colors, the two theories were reconciled theoretically by Erwin Schrödinger [7] and the later discovery of color-opponent cells in the retina and lateral geniculate nucleus (LGN) related the two theories ...

  7. Impossible color - Wikipedia

    en.wikipedia.org/wiki/Impossible_color

    The direct trichromatic description of vision cannot explain these colors, which can involve saturation signals outside the physical gamut imposed by the trichromatic model. Opponent process color theories, which treat intensity and chroma as separate visual signals, provide a biophysical explanation of these chimerical colors. [7]

  8. Color model - Wikipedia

    en.wikipedia.org/wiki/Color_model

    Our trichromatic color vision evolved by duplication of the long wavelength sensitive opsin, found on the X chromosome. One of these copies evolved to be sensitive to green light and constitutes our mid wavelength opsin. At the same time, our short wavelength opsin evolved from the ultraviolet opsin of our vertebrate and mammalian ancestors.

  9. List of states of matter - Wikipedia

    en.wikipedia.org/wiki/List_of_states_of_matter

    Such states of matter are studied in condensed matter physics. In extreme conditions found in some stars and in the early universe, atoms break into their constituents and matter exists as some form of degenerate matter or quark matter. Such states of matter are studied in high-energy physics.