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Brightness scaling according to gamut relativity
Author(s) -
Vladusich Tony
Publication year - 2014
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.21823
Subject(s) - gamut , brightness , power function , theory of relativity , scaling , exponent , function (biology) , matching (statistics) , mathematics , lightness , computer science , physics , theoretical physics , artificial intelligence , mathematical analysis , statistics , optics , geometry , philosophy , linguistics , evolutionary biology , biology
Brill and Carter [Color Res Appl (DOI: 10.1002/col21777 )] rekindle the question of whether brightness scaling is better approximated by a log or power function, proposing on theoretical and empirical grounds that the log function is the correct choice. This note provides a new twist to this debate in terms of a recently introduced theory of brightness and lightness perception, called gamut relativity. The theory reconciles the log and power function formulations and approximately predicts the weight/exponent values associated with these functions. The theory provides, moreover, a unified and testable approach to human performance in brightness magnitude estimation, discrimination and matching tasks. © 2013 Wiley Periodicals, Inc. Col Res Appl, 39, 463–465, 2014