Color Vision_For Oct 1

Color Vision_For Oct 1 - Color Perception Todays Questions...

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Color Perception
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Today’s Questions Color perception : What is color? Theories of color vision What are color & lightness constancy?
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What is Color? Functions of color vision Survival E.g., finding fruit in the forest E.g., stopping at a red light Beauty
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What is Color? Wavelength & hue
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What is Color? Monochromatic: selective reflection of 1 wavelength Polychromatic: selective reflection of more than 1
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What is Color? Achromatic colors: no selective reflection Wavelength % Reflectance white paper silver dollar black lab More luminance = more brightness Less luminance = less brightness
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What is Color? More saturation = more purity Less saturation = less purity
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What is Color? Color dimensions Wavelength hue Saturation purity Luminance brightness
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What is Color? Color mixing Additive mixing of lights : more wavelengths in mix; adds to the light reaching the cone receptors. Primary colors : Red + green + blue = white Subtracting mixing of paints : fewer wavelengths in mix; subtracts from the light reaching the cone receptors. + =
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What is Color? Color mixing Subtractive mixing of pigments: fewer wavelengths reflected from mix. .. Primary colors : Cyan + magenta + yellow = black Complimentary colors : Red + cyan = black Green + magenta = black Blue + yellow = black
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Theories of Color Vision Trichromatic theory of color vision Tenet: Color vision depends on 3 receptor mechanisms Physiological evidence: 3 cones / pigments
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Theories of Color Vision Trichromatic theory of color vision Physiological evidence: 3 cones / pigments Yellow Purple White Blue Green Red
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Color Vision_For Oct 1 - Color Perception Todays Questions...

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