NF EN ISO/CIE 11664-5, T36-007-5 (06/2024)

ISO/CIE 11664-5:2016 sets the method for calculating the coordinates of the L*u*v* CIE 1976 color space as well as the corresponding lightness, chroma, saturation and hue. It includes two methods for calculating the Euclidean distance in this space, representing the perceived value of color differences. It also specifies the method for calculating the u',v' coordinates of the uniform chromaticity diagram. ISO/CIE 11664-5:2016 is applicable to tristimulus components calculated using the colorimetric functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. This part of ISO/CIE 11664 may be used for the specification of color stimulus relating to objects that reflect or transmit light, for which a three-dimensional color space more uniform than the trichromatic system is necessary. This includes self-luminous displays, such as cathode ray tubes, when they are used to simulate objects that reflect or transmit light, if the stimuli are suitably normalized. This part of ISO/CIE 11664, as a whole, does not apply to color stimuli relating to surfaces which appear to emit light as do primary sources of light or which appear to reflect specularly from such lights. Only the uniform chromaticity diagram u',v' defined in 4.1 and the corresponding hue and saturation defined in 4.3 apply to such stimuli.
(Automatic translation from French)