NOTE: Lightness is a term used by an observer to distinguish between lightness and darkness of colored objects, as between light blue and a dark blue paint. It should not be confused with brightness. The observer's perception of lightness is also a recognition of a difference in whiteness or grayness between objects. It is a comparative term referring to the amount of diffusely reflected light coming to the observer's eye from a surface. [p. 32]
[Rainwater, Clarence [Prof. of Physics, San Francisco State College, Original Project Editor Herbert S. Zim]. Light and Color. Golden Press, NY, Western Publishing Company, Inc., 1971.]
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