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Methods for quantifying metamerism. Part 1ndashVisual assessment
Author(s) -
Kuo W G,
Luo M R
Publication year - 1996
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1996.tb01765.x
Subject(s) - hue , colour difference , mathematics , observer (physics) , artificial intelligence , wavelength , computer vision , statistics , computer science , optics , physics , quantum mechanics
This work forms part of the Society of Dyers and Colourists' CMC Working Group 1 project on metamerism and colour constancy. The aim of the project is to derive reliable indices for predicting metamerism and colour constancy. Some 76 metamers were prepared by dyeing wool with acid dyes. Two experiments were conducted to quantify the degree of metamerism using a grey‐scale method. In the first experiment each metamer's colour difference was assessed against a grey scale by a panel of observers under seven light sources. The second experiment was carried out under three sources: D 65 , A and TL 84 . Each observer assessed not only the total colour difference as in the first experiment but also the separate lightness, chroma, and hue components. Observer variations were investigated in terms of observer precision, and within‐and between‐observer errors. Cross‐over wavelengths for each metamer were also examined. It was found that intersections tend to converge on three wavelengths for almost all metamers used here, in agreement with previous findings.