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New method for specifying color‐rendering properties of light sources based on feeling of contrast
Author(s) -
Hashimoto Kenjiro,
Yano Tadashi,
Shimizu Masanori,
Nayatani Yoshinobu
Publication year - 2007
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.20338
Subject(s) - color rendering index , rendering (computer graphics) , contrast (vision) , feeling , light source , gamut , artificial intelligence , computer science , illuminance , computer vision , clarity , computer graphics (images) , optics , psychology , white light , physics , social psychology , biochemistry , chemistry
“Visual clarity” or “feeling of contrast” of object colors under illumination is affected significantly by changing color‐rendering property of light source used. Though the feeling of contrast is considered one of the most important characteristics on color‐rendering properties of light sources, it cannot be estimated adequately by using the present R a method. The new index FCI is proposed for estimating the effect of feeling of contrast quantitatively under any light sources. The FCI is derived using a simple transformation of the gamut area, which is constituted by a specially selected four‐color combination in CIE LAB color space. The FCI correlates well with the illuminance ratio for equal feeling of contrast (or equal visual clarity) on various light sources reported so far. Using the FCI together with the present CIE R a , the color‐rendering capability of a light source can be well clarified. © 2007 Wiley Periodicals, Inc. Col Res Appl, 32, 361–371, 2007