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Representation in CIE a*b* plane of the color coordinates of the chip selected by the owner of the green scarf under neutral daylight illuminant (A, dot), the coordinates of that same chip under one of the test illuminants (B, circle), and of an alternative chip under the same illuminant (C, cross). AC’, indicated by a red line, gives the vector projection of AC onto AB. D represents a zero constancy choice for this object-illuminant combination.
