Paper
11 November 2010 The influence of flame fusion synthetic ruby red on color difference
Xiang Li, Ying Guo
Author Affiliations +
Abstract
The purpose of the study is to investigate the correlations among lightness, chroma and hue angle, confirming the lightness is the key factor to ruby color appearance by calculating color difference. Based on the uniform color space CIE 1976 L*a*b*, the lightness is correlated with hue angle. Purplish red rubies with the medium lightness(L*=40~50) and relatively high chroma (C*=25~35) displayed the best visual appearance by naked eyes. The result of partial correlation analysis revealed the correlation between ▵L* and ▵E* (r▵L*×▵E*=-0.992) is relatively higher than r▵C*×▵E* =0.919 and r▵L*×▵E* =0.885, which means that the change of ruby's color was mostly benefit from ▵L*, ▵C* and ▵H* had the little contribution to ▵E*. It is concluded that ▵L* is the key factor of ruby red evaluating, then followed by ▵C* and ▵H*.
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Xiang Li and Ying Guo "The influence of flame fusion synthetic ruby red on color difference", Proc. SPIE 7855, Optical Metrology and Inspection for Industrial Applications, 78552C (11 November 2010); https://doi.org/10.1117/12.871738
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KEYWORDS
Ruby

Color difference

Visualization

Eye

Earth sciences

Signal processing

Diamond

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