Further improvements to CIECAM97s

CAT02 and HPE triangles

“…Thus, the chromaticity coordinates of the blue primary, denoted as P 12 , is the intersection point of the first and second lines in Eq. (10); the green primary, denoted as P 13 , is the intersection point of the first and third lines in Eq. (10); and the red primary, denoted as P 23 , is the intersection point of the second and third lines in Eq.…”

Dynamic cone response functions for models of colour appearance

“…5 Coefficients of variation (CVs) are given for Models CIECAM97s, FC, and Power, for hue, lightness, colourfulness, brightness, and saturation (the new type based on a ratio of colourfulness to brightness). CVs are calculated as…”

“…1 5,6,7, and 8 that the changes in hue angle are only minor (h p and h mp are new predictors of hue that will be described later).…”

“…In the CIECAM97s model, 1 and in the modified versions of it proposed by Li et al, 2 Luo and Hunt, 1 Moroney, 3 Fairchild, 4 and Hunt et al, 5 a hyperbolic function with a noise constant is used to represent the dynamic cone response. This results in the correlates of hue and saturation exhibiting some changes in values if a colour of a given chromaticity has its luminance factor changed.…”

Mathematical approach for predicting non‐negative tristimulus values using the CAT02 chromatic adaptation transform

“…However, there is a strong objection to using the McCann data because its viewing conditions, mainly using chromatic illuminants under low luminance level, are largely different from the other data sets. The CAT02 matrix given by equation (2) was obtained by excluding the McCann data [9]. Here the McCann data set is also excluded.…”