IMAGE COLOR-APPEARANCE SPECIFICATION THROUGH EXTENSION OF CIELAB

An extension of the CIE 1976 (L, a*, b*) color space, CIELAB is descr ibed for applications in color reproduction. This extension incorporat es a more accurate model of chromatic adaptation, capability to distin guish between the modes of appearance of reflective and self-luminous stimuli, and adjustments to account for changes in surround. The exten sion of CIELAB is referred to as the RLAB color space. This color spac e can be used for calculating metrics of lightness, chroma, hue, and c olor difference. It can also be used to determine the required colors for reproduction across changes in media and viewing conditions. A pil ot experiment testing the RLAB model for cross-media color reproductio n is also described.