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Field trials on color appearance and brightness of chromatic object colors under different adapting‐illuminance levels
Author(s) -
Nayatani Yoshinobu,
Hashimoto Kenjiro,
Takahama Kotaro,
Sobagaki Hiroaki
Publication year - 1988
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.5080130507
Subject(s) - brightness , illuminance , lightness , mathematics , artificial intelligence , chromatic adaptation , chromatic scale , color balance , computer vision , optics , spectral color , metric (unit) , color model , color difference , color space , computer science , physics , color image , image processing , image (mathematics) , enhanced data rates for gsm evolution , operations management , economics
Field trials of the nonlinear color‐appearance model were done by using chromatic object colors under different illuminance levels. Color‐appearance match and brightness match were made for Munsell color pairs by using haploscopic matching. Each color pair was only different in Munsell Chroma. The color‐appearance and the brightness match were realized by adjusting the illuminance of one of the two haploscopic fields. Observed illuminances were significantly different between the color‐appearance and the brightness matches for the same color pairs. The model accurately predicted the illuminances of color‐appearance matches by using the metrics of lightness and chroma Q, T, P of the model, and those of brightness matches by using the metric brightness of the chromatic color B c . In addition, the estimated contribution of colorfulness to brightness of chromatic colors was generally consistent with that predicted by the formula of Ware and Cowan. To test metric brightness B c further, an additional experiment on haploscopic matching was done using illuminants with different R a values. In the experiment, the same samples were used in both fields. Again, matching illuminances in this case were well predicted by using the same contribution factor of colorfulness to brightness already estimated.