I Made a PQ to HLG Converter

[wswartzendruber]

Originally Posted by VictorLS

I believe due to not all players (devices like TVsets etc) support HLG as well as SDR but in nearest future HLG must becomes standard de facto because declared backward compatibility with SDR.

I've concluded that HLG was never intended to be viewed on SDR devices unprocessed. The compatibility that has been mentioned refers to the production environment. Specifically, the BBC states that HLG can be viewed on existing devices for "non-critical monitoring."

From my experimentation, HLG can look really good on SDR (with 709 color) as long as:

1. The player is HLG-aware and tone maps accordingly.
2. The reference white level for the picture is at 75% signal strength.

The Avengers came out looking really good after using the "MARVEL" text at the beginning to set reference white. I'll post an Imgur link when I'm off work.

Screenshots: https://imgur.com/a/9nEZhlR