CAS PS 222 Chapter Notes - Chapter 9: Subtractive Color, Dichromatism, Opsin
10 Aug 2018
School
Department
Course
Professor
Document Summary
Color signals help us classify and identify objects (a banana is green when it is not ripe and yellow when it is ripe) Color facilitates perceptual organization of elements into objects (a bowl of fruit) Electromagnetic spectrum: ems: energy is described by wavelength, spectrum ranges from short wavelength gamma rays to long wvl radio waves, visible spectrum for humans is form 400-700 nm, most perceived light is reflected light. Primary colors : red green blue (basic colors) and yellow. Wavelength and color perception: color perception is related to the wvl of light, violet 400-450 nm, blue 450-490 nm, green 500-575 nm, yellow 575-590 nm, orange 590-620 nm, red 620-700 nm. Spectral sensitivity of rods and cones: rods: have only one visual pigment. Absorbs best at 500nm: cones: have three different pigments. Proposed by young and helmholtz: three different receptor mechanisms are responsible for color vision, behavioral evident:
