If a meter can read up to 1000 nits? - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 
Thread Tools
post #1 of 3 Old 01-31-2020, 05:24 PM - Thread Starter
Member
 
Join Date: Dec 2017
Posts: 32
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Liked: 0
If a meter can read up to 1000 nits?

I haven't really seen any hdr calibration. I am little confused of the process.



So i have read that HDR can produce in a scene up to 1000nits of content. If were calibrating a display with pure white showing 120 nits for room viewing then how is it ever gonna hit 1000 nits? Or is the calibration process difference. Thanks.
12voltb is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 01-31-2020, 06:06 PM
AVS Forum Special Member
 
Join Date: Dec 2014
Location: Mississauga, ON, Canada
Posts: 7,767
Mentioned: 162 Post(s)
Tagged: 0 Thread(s)
Quoted: 5520 Post(s)
Liked: 2225
Quote:
Originally Posted by 12voltb View Post
I haven't really seen any hdr calibration. I am little confused of the process.

So i have read that HDR can produce in a scene up to 1000nits of content. If were calibrating a display with pure white showing 120 nits for room viewing then how is it ever gonna hit 1000 nits? Or is the calibration process difference. Thanks.
HDR uses a PQ EOTF (“gamma curve”) that’s very steep at the upper end (approximate values listed):
50% = 94 nits
75% = 1000 nits
90% = 4000 nits
100% = 10000 nits

The “diffuse white” level is about 90-200 nits, not very different from SDR (Standard Dynamic Range). Everything above that is for highlights. Most consumer TVs can not reproduce these highlights and have to “tone-map” them down to levels they can handle.

As for meters, the X-Rite i1Display Pro Plus can read up to 2000 nits.

Last edited by Dominic Chan; 01-31-2020 at 06:21 PM.
Dominic Chan is online now  
post #3 of 3 Old 02-01-2020, 09:57 PM - Thread Starter
Member
 
Join Date: Dec 2017
Posts: 32
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Liked: 0
Thanks! Just trying to understand more. I follow you though very much. I understand more now on how it works. I am calibrating my vizio m65c-1 to rec709 and finding that the grey scale, gamma, color luminace are good. Less then delta E of 3. But saurtations are little hard to get below delta E 14.1 15.5 5.4 1.3 accross the 0% 25% 50% 100% measures using the avs test patterns. I just keep playing though. Each time I get a little better. Then sometimes I make adujustment and it gets worse. I am assuming at that point it just can't hit the target and hitting the panel limitations. Thanks again for the reply. Time to look into a new tv LOL! Now that I am learning about all this I find myself want better and better panels. LMAO!
12voltb is offline  
Sponsored Links
Advertisement
 
Reply Display Calibration

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off