Color Rendering Index Value Requirement for Wide-Gamut UHDTV Production

In this paper, we propose color rendering index (CRI) values for light-emitting diodes (LEDs) for use in ultra-high definition television (UHDTV) production. UHDTV cameras, designed with ideal camera spectral sensitivities according to the system colorimetry of Recommendation ITU-R BT.2020, can achieve highly accurate color reproduction in daylight. Because LED lighting is increasingly used in television production, it is important to elucidate the effects of its spectral power distribution on color reproduction. In this study, we performed subjective evaluations by comparing reference images captured under simulated standard lights with test images captured under LEDs of various CRI values. Based on our results, we recommend a CRI Ra value of 90 or higher and R9 of 80 or higher.

Published

2015-10

Content type

Original Research

Keywords

Light-emitting diode (LED) lighting, spectral power distribution, color rendering index (CRI), ultra-high definition television (UHDTV), color reproduction

DOI

10.5594/M001627

ISBN

978-1-61482-956-0