Investigation of colour appearance models for illumination changes across media

The key to achieving successful cross-media colour reproduction is a reliab le colour appearance model, which is capable of predicting the colour appea rance across a variety of imaging devices under different viewing condition s. The two most commonly used media, CRT displays (soft copy) and printed i mages (hard copy), were included in this study, using four complex images. The original printed images were captured using a digital camera and proces sed using eight colour appearance models (CIELAB, RLAB, LLAB, ATD, Hunt96, Nayatani97, CIECAM97s, and CAM97s2) and two chromatic adaptation transforms (von Kries and CMCCAT97). Psychophysical experiments were carried out to assess colour model performa nce in terms of colour fidelity by comparing soft-copy, and hard-copy image s. By employing the memory-matching method, observers categorized the repro ductions displayed on a CRT and compared them to the original printed image s viewed in a viewing cabinet. The experiment was divided into three phases according to the different colour temperatures between the CRT and light s ource, i.e., print (D50, A, and A) and CRT (D93, D93, and D50), respectivel y). It was found that the CIECAM97s-type models performed better than the o ther models. In addition, input parameters for each model had a distinct im pact on model performance. (C) 2001 John Wiley & Sons, Inc.