HDR production – Tone mapping techniques and related round-trip performances for both SDR and HDR sources mastering
Date & Time
Tuesday, October 25, 2022, 6:00 PM - 6:30 PM
David Touze
Where content producers have had to make drastic choices when allocating the limited contrast and colors in SDR, HDR offers them the possibility to show more - meaning telling stories with greater freedom and flexibility.
However, while future-proof, HDR content presents a challenge of its own: The wide variation in capabilities among HDR displays conflicts with the desire to have any HDR or SDR production play optimally on any display, HDR or SDR, regardless.
The general solution to this issue is tone mapping, either tone compression, which maps from HDR to a lower-luminance HDR or SDR, or tone expansion, which maps from SDR or HDR to a higher-luminance HDR.
Though the trend is to produce the highest quality content in HDR, legacy content is ever-present and lots of new content is still produced in SDR. Mixing feeds in production requires tone expansion for SDR content to match the HDR. Distribution paths that require tone compression back to SDR, should be served without degradation. In this context, a perfect SDR – HDR – SDR round trip feature is required to preserve artistic intent for all of the content. Further, in a live context, such tools need to be automatic and low latency.
In this paper, various techniques of tone mapping, including static solutions such as look-up tables and dynamic solutions based on metadata, are discussed. The relative advantages are considered and performance of each is analyzed. Particular attention is paid to the round-trip performance, which is important to content producers who master with both SDR and HDR sources yet wanting to exploit the full range of storytelling capabilities that an HDR work can offer.
Location Name
Salon 1
Take-Aways from this Presentation
The session addresses the complexity of live production where a live HDR program shall be created from legacy and live SDR and HDR feeds. The presentation makes the focus on tone mapping tools for tone expansion (SDR to HDR) and tone compression (HDR to SDR), exploring the static or dynamic methods and following industry requirements for a perfect SDR – HDR – SDR round-trip scenario. Perfect round-trip feature aims at ensuring creative intent fidelity from any HDR or SDR sources. The talk will provide metrics from the Round-Trip Production feature of Advanced HDR by Technicolor solution as per technology benchmark