Images of white-colored surfaces, such as white paper or white clothing, should be perceived as “white,” regardless of the illumination at the scene that is being reproduced.
Additional Information: To produce authentic color sensations (i.e., those corresponding to the expectation of a user watching a reproduction of reality), it is desirable to have images of nonselective white surfaces always perceived as “white,” regardless of the illumination at the source scene. This can be accomplished by establishing the appropriate reference white on the visual display. For older displays, the chromaticity of Commission Internationale de l'Eclairage (CIE) (International Commission on Illumination) C (u' = 0.201; v' = 0.461), may be used as reference white for the display. This is equivalent to the standard illuminant D50, corresponding to a color temperature of 5,000 degrees Kelvin. For more modern displays, standard illuminant D65 should be used, corresponding to a color temperature of
6,500 degrees Kelvin. See IDMS (2012) for measurement information. 13 9241-303
© ISO. This material is excerpted from ISO 9241-303: 2011 with permission of ANSI on behalf of ISO. All rights reserved.