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white light RGB light in equal amounts color is a psycho physical response color is described in 3 ways 1 hue 2 lightness 3 saturation the human eye sees from 380 770 nm NOT 400 700nm ex 380550770 blue green red theories of how color is seen 1 psycho physical theory invented by Young Helmhotlz the eye sees three colors of light red green and blue that are reflected from objects three types of vision 2 trichromatic sees all three colors 2 dichromatic sees only two of the three colors 2 monochromatic sees only black and white 2 opponent vision theory invented by Herning perceptors in the eye sees three sets of colors 1 red green 2 yellow blue psychological color sets 3 black white color after image when an image that is one of these colors is looked at when looked away the opposing color is seen pseudoisochromatic color test colored images surrounded by grey pebbles H even people with good color sight can have bad color sight in certain conditions photopic vision daylight good illuminance eye peaks at 550nm scotopic vision low illuminance eye peaks at 505nm scectrophotometer machine that measures color gives a curve of spectral reflectance spectral reflectance of the amount of each color of light reflected additive primary colors red green blue subtractive secondary colors additive secondary colors cyan magenta yellow subtractive primary colors each color is created by the 2 colors next to it on the color wheel H cyan no red magenta no green yellow no blue viewing an object under lights the color opposite on
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