Modelling Simultaneous Contrast Effect on Chroma Based on CAM16 Colour Appearance Model

摘要

Existing colour appearance models could barely predict simultaneous colour contrast effect and our previous studies were intended to focus on hue and lightness contrast. Thus, there is a lack of study on the chroma contrast effect. The overall goal is to develop a comprehensive colour contrast model to consider all the target/background colour combinations. In this study, a psychophysical experiment was carried out to investigate the simultaneous contrast effect on chroma using Albers' pattern via colour matching method on a self-luminous display. Five coloured targets were studied. A total of 49 test/background combinations were presented, 1,078 matches were accumulated. The results clearly showed that the chroma of a target considered moved toward the opposite direction of the surrounding colours, which indicated the chroma contrast effect should be integrated into the colour appearance model. A chroma contrast function based on CAM 16 colour appearance model was derived based on the data with high accuracy.