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Techniques for simulating object color under changing illuminant conditions on electronic displays
Author(s) -
Troost Jimmy M.,
De Weert Charles M. M.
Publication year - 1992
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.5080170506
Subject(s) - standard illuminant , chromaticity , artificial intelligence , computer science , daylight , object (grammar) , computer vision , mathematics , graphics , invariant (physics) , set (abstract data type) , computer graphics (images) , optics , physics , programming language , mathematical physics
We compare several computational schemes that can be used for the simulation of object colors under changing illuminant conditions on electronic displays. These schemes differ in the assumptions that are made concerning illuminant invariant quantities, and the amount of a priori information that is required. This latter feature is especially important for computer graphics applications and theoretical color constancy research because in many instances information about illuminant and object characteristics is minimal. A large set of tristimulus values of Munsell papers, as defined under CIE Standard Illuminant C, served as input data. Next, illuminant invariant quantities were obtained for each computational scheme that were used to predict x, y chromaticity coordinates and relative luminosity Y under nine different phases of daylight, varying from 4000 K to 20000 K. It was found that the differences between so‐called reflectance models on the one hand, and theoretically less accurate tristimulus ratio models on the other, are small and in most cases within three MacAdam units of color difference ≈1 JND).