n. Redness–greenness coordinate in certain transformed color spaces, generally used as the Δa, or difference in “a” between a specimen and a standard reference color. If “a” or Δa is plus, then there is more redness than greenness; if “a” or Δa is minus, then there is more greenness than redness. It is normally used with b or β as part of the chromaticity or chromaticity difference.
See uniform chromaticity coordinates.
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References
McDonald and Roderick (1997) Colour physics for industry, 2nd edn. Society of Dyers and Colourists, West Yorkshire, England.
Billmeyer FW and Saltzman M (1966) Principles of color technology. John Wiley and Sons Inc., New York.
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(2006). “a” or “α”. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30160-0_2
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