A set of specific, ANSI-prescribed conditions for the optimum viewing and evaluation of color transparencies and prints. Due to the tendency for different lighting conditions and other environments to alter any or all of the values of a color and a color's interaction with others, the standard viewing conditions were devised as a means of attempting to objectify the evaluation of color.
Standard viewing conditions are: a neutral gray surround, a light source with a temperature of 5000 K, and an illumination intensity of 200 footcandles. A large transparency should have a 2:4-inch gray border and should not have a white surround.