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Color effect of light sources on peridot based on CIE1976 L*a*b* color system and round RGB diagram system
Author(s) -
Tang Jun,
Guo Ying,
Xu Chang
Publication year - 2019
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.22419
Subject(s) - hue , spectral color , rgb color model , standard illuminant , color temperature , color space , primary color , chromaticity , optics , color rendering index , spectral power distribution , brightness , light source , color model , mathematics , physics , artificial intelligence , computer science , light emitting diode , image (mathematics)
Previous research indicated that the peridot's color is dominated by the selective absorption of visible light caused by ferrous ion, the hue angle of which is in an inverse ratio of the concentration of Fe 2+ . This article focuses on the color effect of peridot under different standard light sources based on the CIE1976 L*a*b* color space system and round RGB diagram system and tries to find the best one for its grading and display. Based on the results of a series of experiments, including electron microprobe analysis, spectrophotometer, UV‐Vis spectrum, standard illumination box, and Munsell neutral color chips, it was suggested that the spectral power distribution and color temperature of a standard light source significantly influence the color of peridot in terms of lightness and chroma, particularly in the hue of peridot. As for color grading and displaying of peridot, standard light source A fails to fit in, and the color of peridot under a fluorescent light source has a higher chroma but a lower hue angle than that under daylight light source. The best choice for grading and displaying peridot is the standard light source D 65 . It is better to distinguish the hue of peridot when it is calculated by the round RGB diagram system.