Achieving and Maintaining Perceptual Intent with HDR Imaging

Abstract

Though displays have undergone dramatic shifts in the last 30 years, many of the imaging pipeline elements needed to create a compelling visual experience have only started to catch up as HDR becomes more prominent. Here, a look at how those new elements are being incorporated and what the changes mean for the industry.

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

“…Previous studies 28,29 pointed out that the reference white level in HDR contents could differ from scene to scene. In this analysis, the mean color differences of individual observers at one peak luminance level (200 cd/m 2 ) were compared to those at reference white levels: 100, 500, and 1000 cd/m 2 .…”

“…However, the use of the peak luminance of HDR displays is usually reserved to present specular highlights in scenes 1 . It is, in fact, not universally agreed what reference white level for HDR contents should be because a white object with a diffuse reflection in a scene is typically regarded as a reference white point, 28,29 although ITU‐R BR.2480 30 suggests 200 cd/m 2 with the D65 chromaticity coordinate. This issue is also quite important in computing OM magnitudes because the magnitudes can be exaggerated or understated for some colors depending on the reference white level.…”

VR-NeRF: High-Fidelity Virtualized Walkable Spaces

“…PQ was designed to optimally encode the large luminance range from 0 to 10,000 cd/m 2 in 10-16 bits while minimizing visible banding artifacts. This was achieved by approximating the integral of just noticeable differences based on the contrast sensitivity function of the human visual system [Kunkel 2022]. The function (2) maps the input luminance 𝑌 ∈ [0, 10,000] cd/m 2 to the 'PQ space' in the unit range.…”