THE LLAB (L-C) COLOR MODEL

A new colour model, named LLAB (l:c) is derived. It includes two parts : the BFD chromatic adaptation transform derived by Lam and Rigg, and a modified CIELAB uniform colour space. The model's performance was co mpared with the other spaces and models using the LUTCHI Colour Appear ance Data Set. The results show that LLAB (l:c) model is capable of pr ecisely quantifying the change of colour appearance under a wide range of viewing parameters such as light sources, surrounds/media, achroma tic backgrounds, sizes of stimuli, and luminance levels. It had a simi lar performance as that of the Hunt Colour appearance model. The LLAB (l:c) model was also tested using various colour difference datasets. The model gave a similar performance as the state-of-the-art colour di fference formulae such as CMC, CIE94, and BFD. This performance is con sidered to be very satisfactory, and the model, therefore, should be c onsidered for field trials in applications such as colour specificatio n, colour difference evaluation, cross-image reproduction, gamut mappi ng, prediction of metamerism and colour constancy, and quantification of colour-rendering properties. The model does not give predictions fo r chroma (as distinct from colourfulness), or for brightness, and it d oes not include any rod response. (C) 1996 John Wiley & Sons, Inc.