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The way objects appear to us and the judgments we make about color are determined by a combination of many factors. Some of the factors are easy to measure and some are not. Individual perceptual differences, eye fatigue and mood of the viewer are as important to a discussion about color as are the properties of light sources and objects. Colors as perceived by the human eye cannot be simulated by any

instrument, nor can they be reproduced by any printing process.

Light is essential for vision. Light causes color. Without light, color would not exist. Light that appears white to us, such as light from the sun, is actually composed of many colors. Each color has its own measurable wavelength or combination of wavelengths. (Light travels in waves much like waves produced by