Tech Paper 2021: This paper explores using a Colour Appearance Model (CAM) with Chromatic Adaptation Transform (CAT) for more accurate HLG-to-SDR down-mapping, producing natural results compared to traditional tone-mapping methods.
Abstract
Most of today’s High Dynamic Range (HDR) Hybrid Log-Gamma (HLG) to Standard Dynamic Range (SDR) conversions rely on a mathematical approach for colour volume reduction from a BT.2100 container into a BT.709 one, typically through “tone-mapping” applied to a luminance signal. Examples can be found in ITU-R report BT.2446. Such “down-mapping” conversions attempt to maintain colour fidelity between the two visual representations and are usually implemented in a three-dimensional Look Up Table (LUT). Such approaches, however, cannot take full account of psychovisual factors and may struggle to differentiate between colours such as yellow and brown, that are similar in hue, but vary in luminance.
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