The application of memory and preferred colours to colour rendition evaluation of white light sources is reviewed. Four metrics are discussed: Sanders’ preferred colour index, Judd’s flattery index, Thornton’s colour preference index and Smet’s memory colour rendition index. Following a review of the metrics themselves, the paper continues with a discussion of their predictive performance in terms of agreement with psychophysical data on visual appreciation and naturalness perception. Their performance was also compared to that of several other colour rendition metrics and the impact on the predictive performance of a metric’s emphasis on chroma enhancement has been evaluated.
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