ColorVision [Compatibility Mode]

ColorVision [Compatibility Mode] - Color and lightness How...

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1 Color and lightness How much difference does color make? How much difference does color make?
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2 Physical conditions of color perception Physical condition 1: there is light
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3 Physical conditions of color perception Physical condition 2: Selective reflection of wavelength from object surface An orange is orange because it rejects (reflects) the wavelengths which we perceive (interpret) as orange and absorbs all other wavelengths of light! The reflectance curves of different surfaces How do we perceive color? (Physiological mechanisms of color perception)
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4 Young-Helmholtz’s Trichromatic theory : All colors result from responses of three receptor mechanisms Evidence: The color matching experiment: Three different wavelengths are needed for matching any color http://www.exploratorium.edu/exhibits/mix n match _ _ In modern terms, all colors are signaled by the ratio of activity in the three cone receptor mechanisms with different spectral sensitivity S: S-cones, or Short wavelength sensitive cones M: M-cones, or medium wavelength sensitive cones L: L-cones, or Long wavelength sensitive cones How is yellow coded by cones? There are no “yellow-sensitive receptors” The perception of Yellow relies on the activations of both long-wavelength sensitive cones and medium-wavelength sensitive cones Any pure or mixed lights that that produce following activation pattern across the the three types of cones will be perceived as yellow S-cone M-cone L-cone
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ColorVision [Compatibility Mode] - Color and lightness How...

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