Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Announcements and Chat > General Discussion

Reply
 
Thread Tools Search this Thread Display Modes
Old 26th March 2024, 17:20   #441  |  Link
wswartzendruber
hlg-tools Maintainer
 
wswartzendruber's Avatar
 
Join Date: Feb 2008
Posts: 412
I was thinking about something several days ago and had a realization. With SDR, indoor and outdoor scenes tend to have small variance in where reference white would be. But with HDR, there is a lot more variance between these scenes. With the BBC putting reference white at 75% HLG, and then by viewing this on a SDR display, we effectively have these dimmer indoor scenes "pushed up" towards 75% and the brighter outdoor scenes "pushed down" towards the same level. This seems to go a long way in making HLG look "like it should" despite the greater variance in HDR's levels of indoor vs. outdoor scenes.

As best I can tell, the 75% HLG level for reference white was a BBC innovation, as NHK's original specification called for 50%. Another way to put this is that the NHK seems to have viewed HLG as a hack to have basic monitoring work on existing 10-bit equipment while the BBC wanted HLG to "just work" on existing 10-bit consumer devices.
wswartzendruber is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 12:03.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.