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Abnormal Hue‐Angle change of the gemstone tanzanite between CIE illuminants d65 and a in CIELAB color space
Author(s) -
Liu Yan,
Shigley James,
Fritsch Emmanuel,
Hemphill Scott
Publication year - 1995
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.5080200407
Subject(s) - hue , color space , optics , color temperature , incandescent light bulb , spectral color , spectral sensitivity , color difference , sensitivity (control systems) , chromaticity , lightness , color vision , mathematics , colorimetry , color rendering index , physics , color model , artificial intelligence , computer science , white light , wavelength , engineering , electronic engineering , image (mathematics) , enhanced data rates for gsm evolution
The blue‐to‐purple color appearance change observed in some rare specimens of the gemstone tanzanite between daylight and incandescent light is contrary to the hue‐angle change calculated between CIE illuminants D65 and A in CIELAB color space. This abnormal calculated hue‐angle change for tanzanite can be corrected by using the spectral sensitivity functions of the three kinds of cone photoreceptors to directly calculate color. This study suggests that the cone spectral sensitivity functions are more fundamental in color calculations than the CIE color‐matching functions.