A colour‐appearance transform for the CIE 1931 standard colorimetric observer

A physiologically plausible model of colour vision, based on the CIE 1931 standard colorimetric observer, is shown to provide a colour order system giving reasonably good predictions of the unique-hue loci, of constant-hue loci, and of constant-saturation loci, as judged by comparison with the Munsell and NCS systems, for daylight illumination. When combined with a chromatic-adaptation transform of the von Kries type, the model is also shown to give quite good predictions for real surface colours seen in tungstenlight (SA) illumination.