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The proper use of indices of metamerism
Author(s) -
Berns Roy S.
Publication year - 2008
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.20450
Subject(s) - standard illuminant , mathematics , colour difference , color difference , magenta , artificial intelligence , pattern recognition (psychology) , computer science , optics , speech recognition , physics , enhanced data rates for gsm evolution , inkwell
General (spectral) and special (colorimetric) indices of metamerism have been developed to evaluate match quality for metameric and parameric specimens. For a parameric pair, in which there is not an exact colorimetric match for a reference observer and illuminant, various corrections can be used to adjust one of the stimuli such that an exact match is achieved. These adjustments can be spectral or colorimetric. In cases where the mismatch is large, the resultant metameric index may be misleading. A small index of metamerism and a large color difference under the reference conditions has a different interpretation than its converse. This is demonstrated for blue, yellow, magenta artist paints matching a spectrally nonselective gray. The implication is that special indices of metamerism should be calculated only for a limited range of color differences under the reference condition. It is suggested that metameric indices should not be calculated for pairs having a mismatch beyond a threshold value, for example, 5 Δ E ab * . © 2008 Wiley Periodicals, Inc. Col Res Appl, 33, 509–512, 2008