Study on Perceived White Point of Wide Color Gamut Display

The white point, representing neutral white on the chromaticity diagram and crucial for display color calibration, is typically set to D65. However, its suitability for wide color gamut (WCG) displays with narrowband spectral characteristics remains underexplored. This study examined three different primary spectra WCG displays and one sRGB reference display. Using individual color matching functions (CMFs) derived from the Asano model, we estimated the spectra of visual matches on the WCG display to reference points (on sRGB display) with varying correlated color temperatures (CCT) and Duv values. The results revealed chromaticity mismatch in white points between the reference and WCG displays, characterized by shift of the matched color from the reference in the +u' − v' direction, which became increasingly pronounced as the display's color gamut widened and the primary spectra narrowed. The CIE 2006 CMFs were found to outperform the CIE 1931 2° and CIE 1964 10°CMFs in reducing chromaticity mismatches, demonstrating their superior applicability for WCG displays. Additionally, two effective chromaticity mismatch methods were identified: one is a linear transformation matrix, and the other involves shifting the peak wavelength of the primary spectra of narrow‐band displays.