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Abstract
The concept of the gamut of a colour reproduction system is explained, starting from the spectrophotometric description of colorants used. The extension is made from spectrophotometry to C1E 1931 XYZ colorimetry, a system still in use for the description of colour gamuts. Advantages of the CIE 1976 u’,v’ uniform chromaticity chart are discussed and related to CIE 1976 L*u*v* and L*a*b* uniform colour spaces. The use of Status A trilinear density plots is described and examined in terms of visual uniformity related to the Munsell system. The three-dimensional representation of a colour gamut in CIE 1976 L*a*b* colour space is related to colour sensitometric results which explain and allow Interpretation of the colorimetry. Applications of the systems reviewed are made to real surface colours and a variety of reflection and transmission photographic systems under different conditions of use, as well as to images formed by visual display units and broadcast television.
Notes
Paper presented at the RPS symposium “The Electronic Image”, Bath, September 1993.