This second edition has been rewritten, updated, and enlarged, describing the basic principles of color vision and colorimetry. The history of color is described, along with the main methods used to measure color and their associated color systems, and the human eye and its color detectors are explained with some detail. The book has been written with students in an introductory color course in mind, but those who have experience in the field will also benefit from the compendium of data within.