chromaticity diagram

British

noun

physics a diagram in which values of two chromaticity coordinates are marked on a pair of rectangular axes, a point in the plane of these axes representing the chromaticity of any colour

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Printers are generally better than digital monitors or CRT's: but the fundamental problem is that the gamut of colours seen by the eye is roughly horseshoe shaped when plotted as a chromaticity diagram, whereas the convex combination of any number of pigments can only be a straight-sided approximation of a horseshoe shape.

From New York Times

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