This CIE Standard specifies the method of calculating the coordinates of the CIE 1976 L*a*b*colour space including correlates of lightness, chroma and hue. It includes two methods for calculating Euclidean distances in this space to represent the perceived magnitude of colour differences.The Standard is applicable to tristimulus values calculated using colour-matchingfunctions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. The Standard may be used for the specification of colour stimuli perceived as belonging to a reflecting or transmitting object, where a three-dimensional space more uniform than tristimulus spac