Perceived white region of displays with varied color gamuts

The aim of this study was to explore the perceived white region of display devices with varying color gamuts. Three displays were selected, with color gamuts approximating sRGB, DCI-P3, and BT.2020, respectively. For each display, a subjective rating experiment was conducted to evaluate the perceived neutrality of the image white point. The experiment used 5 images, each featuring 126 distinct white point chromaticities (18 CCT × 7 <i>Duv</i>). The neutrality ratings were fitted by a bivariate Gaussian function on the <i>u₁₀'v₁₀'</i> chromaticity diagram, yielding the tolerance ellipse of perceive white points for each display. It can be observed that as the color gamut expands, the CIE 1976 <i>u₁₀'v₁₀'</i> chromaticity center of the perceived white region shifts toward higher CCT and more negative <i>Duv</i> values. Additionally, larger discrepancies in the white regions across displays were observed when calculated using different CIE color-matching functions (CMFs). These findings are expected to serve as a valuable reference for defining the white point on display devices with varying color gamuts.