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  2. Tetrachromacy - Wikipedia

    en.wikipedia.org/wiki/Tetrachromacy

    The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet. [1]Tetrachromacy (from Greek tetra, meaning "four" and chroma, meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye.

  3. Metamerism (color) - Wikipedia

    en.wikipedia.org/wiki/Metamerism_(color)

    However, the human eye contains only three color receptors (three types of cone cells), which means that all colors are reduced to three sensory quantities, called the tristimulus values. Metamerism occurs because each type of cone responds to the cumulative energy from a broad range of wavelengths, so that different combinations of light ...

  4. List of reagent testing color charts - Wikipedia

    en.wikipedia.org/wiki/List_of_reagent_testing...

    Reagent test Alcohols: Forms Lucas test in alcohols is a test to differentiate between primary, secondary, and tertiary alcohols. Alkaloids: Forms Froehde Liebermann Mandelin Marquis Mayer's Mecke Simon's: Amines, and amino acids: Forms Folin's: Barbiturates: Class Dille–Koppanyi Zwikker: Benzodiazepines: Class Zimmermann: Phytocannabinoids ...

  5. Take this test to understand why you perceive 'The ... - AOL

    www.aol.com/news/2015-03-03-take-this-test-to...

    Different people have different amounts of "color receptors" in their eyes, and this test will determine how many you have, and how it affects your perceptions. 1 Photos.

  6. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    Thus human color perception is determined by a specific, non-unique linear mapping from the infinite-dimensional Hilbert space H color to the 3-dimensional Euclidean space R 3 color. Technically, the image of the (mathematical) cone over the simplex whose vertices are the spectral colors, by this linear mapping, is also a (mathematical) cone in ...

  7. LMS color space - Wikipedia

    en.wikipedia.org/wiki/LMS_color_space

    The Hunt and RLAB color appearance models use the Hunt–Pointer–Estevez transformation matrix (M HPE) for conversion from CIE XYZ to LMS. [4] [5] [6] This is the transformation matrix which was originally used in conjunction with the von Kries transform method, and is therefore also called von Kries transformation matrix (M vonKries).

  8. Opponent process - Wikipedia

    en.wikipedia.org/wiki/Opponent_process

    Unique hues can differ between individuals and are often used in psychophysical research to measure variations in color perception due to color-vision deficiencies or color adaptation. [4] While there is considerable inter-subject variability when defining unique hues experimentally, [ 3 ] an individual's unique hues are very consistent, to ...

  9. Cone cell - Wikipedia

    en.wikipedia.org/wiki/Cone_cell

    All of the receptors contain the protein photopsin. Variations in its conformation cause differences in the optimum wavelengths absorbed. The color yellow, for example, is perceived when the L cones are stimulated slightly more than the M cones, and the color red is perceived when the L cones are stimulated significantly more than the M cones.

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