NATS 1870 Study Guide - Final Guide: Color Vision, Contrast Effect, Anthocyanin
16 Oct 2011
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October 19, 2009: give two examples of how the development of a new pigment has had an impact on painting and painting style. Ultramarine used for religious figures hard to make, expensive. Household & car paint arsenic based green paints & less choice of paint depended on mass market: describe the chemical process responsible for leaves turning, green to yellow; b) green to red. Not all leaves go red, needs high sugars anythocyanin. Usually outside facing south turns red first. Red outside of tree 1st, green more on inside. Cones affect/help perceive color, doesn"t see fixed color. Is an active process eye + brain are continually comparing objects, surrounding, illumination conditions. Give rise to certain adaptive processes like simultaneous contrast. A color will appear different depending on its surroundings. Color vision: process of decoding: wavelength ( , intensity (i) Response to visible light is based on chemical process in cells cones & rods.
