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Abstract A nonlinear color‐appearance model was extended to apply to white and light‐gray background. Based on this extended model, two kinds of chromatic‐adaptation transforms were derived, which correspond to lightness‐chroma match and brightness‐colorfulness match. The chromatic‐adaptation transform for lightness‐chroma match is also an extension of the transform proposed by CIE for further testing. The differences between the two transforms were confirmed by visual observations. The usefulness of a combination of a color‐appearance model and its corresponding chromatic adaptation transform is discussed. In addition, the practical importance of brightness and colorfulness is discussed.
Nayatani et al. (Wed,) studied this question.