Re: NBCU Github Single-Master Workflow Recommendation

Oops. …With Github link:

https://github.com/digitaltvguy/NBCUniversal-UHD-HDR-SDR-Single-Master-Production-Workflow-Recommendation-LUTs

-Chris


From: Seeger, Chris (NBCUniversal) <Chris.Seeger@nbcuni.com>
Date: Tuesday, October 31, 2023 at 8:02 AM
To: public-png@w3.org <public-png@w3.org>
Subject: NBCU Github Single-Master Workflow Recommendation
Hi All,

Here is a link to the NBCU Github Single-Master Workflow Recommendation.

It includes a description of our current workflow that uses a core HDR production to simultaneously produce both HDR and SDR using specific transformations between HLG, SDR and PQ transfer functions.

It also includes a folder on our implementation of BT.2124 thru a plug-in that converts from YCbCr to ITP-PQ-BT.2020 so we can plot the results of the transformations for objective testing. The benefits of ITP for video (also when subsampled) are described here:

https://professional.dolby.com/siteassets/pdfs/ictcp_dolbywhitepaper_v071.pdf

In that same folder are spreadsheets with several reference plots that translate the results from the Vooya plug-in described above as JND values (Just Noticable Difference). Any JND value above “1” has a “JND”. A very easy metric to translate…… The plots also break out separate Intensity, Chroma and T/P plots to understand the conversion strategies. The plots are dependent on the Sarnoff “Yellow Brick Road” pattern (a thumbnail is in the spreadsheet for reference).

There are a few ebooks we build as reference for video professionals. The PDF versions are in the Github repository, but they are also available in the Apple Book store by searching “UHD”.

The mathematics in the spreadsheets are based on collaboration with many people but special thanks go to Jaclyn Pytlarz and Scott Miller of Dolby, Bill Redmann of Interdigital, Lars Borg of Adobe.

Best,

Chris Seeger
Director, Advanced Content Production
Office of the CTO
NBCUniversal, LLC
C: 551-238-3768