Definition
The coordinates of the CIE 1960 UCS diagram are calculated from the 1931 CIE XYZ tristimulus value or from the xy chromaticity coordinates thus:
The 1976 CIE u′v′ chromaticity diagram was obtained by stretching the v-axis of the UCS diagram (u′ = u, v′ = 1.5v), and the coordinates are calculated thus:
where, alternatively, U′ = 4X/9, V′ = Y, and W′ = −X/3 + 2Y/3 + Z/3 and u′ = U′ /(U′ + V′ + W′) and v′ = V′ /(U′ + V′ + W′).
Both the CIE 1960 UCS diagram and the 1976 CIE u′v′ chromaticity diagram are associated with the 1931 Y tristimulus value to provide a complete trichromatic specification since V = V′ = Y.
Historical Development
The 1931 CIE system of...
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References
CIE Pub. No. 15: Colorimetry, Central Bureau of the CIE, Vienna (2004)
Hunt, R.W.G.: The Reproduction of Colour, 6th edn. Wiley, Chichester (2004)
Judd, D.B., Yonemura, G.T.: CIE 1960 UCS diagram and the muller theory of color vision. J. Res. Natl. Bur. Stand. A. Phys. Chem. 74A(1), 23–30 (1970)
Wright, H.: The Measurement of Colour, 4th edn. Adam Hilger, London (1969)
Hunt, R.W.G., Pointer, M.R.: Measuring Colour, 4th edn. Wiley, Hoboken (2011)
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Westland, S. (2015). USC Diagrams; Uniform Chromaticity Scales; Yu'v'. In: Luo, R. (eds) Encyclopedia of Color Science and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27851-8_10-1
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DOI: https://doi.org/10.1007/978-3-642-27851-8_10-1
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