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A comparison of color fidelity metrics for light sources using simulation of color samples under lighting conditions
Author(s): Hyeokjun Kwon; Yoojin Kang; Junwoo Jang
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Paper Abstract

Color fidelity has been used as one of indices to evaluate the performance of light sources. Since the Color Rendering Index (CRI) was proposed at CIE, many color fidelity metrics have been proposed to increase the accuracy of the metric. This paper focuses on a comparison of the color fidelity metrics in an aspect of accuracy with human visual assessments. To visually evaluate the color fidelity of light sources, we made a simulator that reproduces the color samples under lighting conditions. In this paper, eighteen color samples of the Macbeth color checker under test light sources and reference illuminant for each of them are simulated and displayed on a well-characterized monitor. With only a spectrum set of the test light source and reference illuminant, color samples under any lighting condition can be reproduced. In this paper, the spectrums of the two LED and two OLED light sources that have similar values of CRI are used for the visual assessment. In addition, the results of the visual assessment are compared with the two color fidelity metrics that include CRI and IES TM-30-15 (Rf), proposed by Illuminating Engineering Society (IES) in 2015. Experimental results indicate that Rf outperforms CRI in terms of the correlation with visual assessment.

Paper Details

Date Published: 6 September 2017
PDF: 6 pages
Proc. SPIE 10378, Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 1037808 (6 September 2017); doi: 10.1117/12.2268378
Show Author Affiliations
Hyeokjun Kwon, LG Display (Korea, Republic of)
Yoojin Kang, LG Display (Korea, Republic of)
Junwoo Jang, LG Display (Korea, Republic of)


Published in SPIE Proceedings Vol. 10378:
Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems
Nikolaus Dietz; Ian T. Ferguson, Editor(s)

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