Analysis of standard chromaticity gamut area metrics

Abstract

It is herein proposed to measure display gamut sizes by employing the International Telecommunication Union-Radiocommunication Sector Recommendation BT.2020 (Rec. 2020) area-coverage ratios in the xy chromaticity diagram rather than the standard gamut area metrics that use the horseshoe-shaped spectrum chromaticity area as the target in the u 0 v 0 chromaticity diagram. It is more reasonable to use the Rec. 2020 gamut than the spectrum gamut as the target because the Rec. 2020 area-coverage ratios in the xy diagram are better correlated than the spectrum areacoverage ratios with the volume-coverage ratios of object color gamuts that are visually significant in displaying natural scenes.

Efficiently evaluating the effect of color gamut and spectral bandwidth on observer metamerism in high dynamic range displays

“…First, based on the fact that the DCI.P3 approximately covers 72.0% of the Rec.2020 on the xy chromaticity coordinate, the intermediate chromaticity gamuts were defined to cover 75%, 80%, 85%, 90%, and 95% of the Rec.2020, respectively. Specifying gamut coverage in xy chromaticity follows display industry practice, and usefully been shown to correlate well with gamut volume 23 . Second, possible xy coordinates of each primary were chosen along the curved lines passing the xy coordinates of each primary of the three standards.…”