Video Black Level - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 5 Old 05-24-2012, 08:47 PM - Thread Starter
AVS Special Member
 
Mike99's Avatar
 
Join Date: Sep 2004
Location: Illinois
Posts: 2,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked: 45
I was checking out the video black level on my new build to see if it was OK. The HTPC has an ECS H61 mobo and Intel G620 CPU & is connected to a Sony HDTV via HDMI.

I used the THX Opimizer setup that was on a standard DVD & could not display the THX drop down shadow or more than 7 shades of gray/black no matter how I set the HDTV's black level / brightness. I went into the Intel Graphics properties & changed the Quantization Range from Limited to Full but it made no difference.

I used the same DVD on my Blu-ray player connected to the same HDMI connection on the HDTV and I can adjust the HDTV to display all 10 blocks of shades of black & the drop shadow. And IIRC my standard DVD player also would allow blacker-than-black.

The only variable is the HTPC. The 7 shades of black from the HTPC appear to match the 7 shades of black from the Blu-ray player with the HDTV properly adjusted. IOW I'm not losing anything from the HTPC.

But I am curious why the HTPC is not even able to output a B-T-B signal.
Is there another setting which controls that?
Mike99 is online now  
Sponsored Links
Advertisement
 
post #2 of 5 Old 05-25-2012, 06:34 AM
Member
 
mungee's Avatar
 
Join Date: Dec 2009
Location: So Cal
Posts: 139
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 13
Since I posted a similar question a week ago.

Other than your TV, Graphic card, AV reciever (does not apply to your case), Graphics card settings there are also setting in the BD/DVD players software that you can tweek to get to "ideal black" and "ideal white".

Also you might want to invest in a decent video calibration software if you are that picky about video quality. I use Disney's World of Wonder HD there are a few others out there.
mungee is offline  
post #3 of 5 Old 05-25-2012, 06:40 AM
Member
 
Jon_R's Avatar
 
Join Date: Jul 2002
Posts: 96
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Could it be the output of PC range vs TV range?

0-255 (aka PC levels) and 16-235 (aka TV levels)

I'm new to hdmi having been on component for 5 years so it might not be relevant.
Jon_R is offline  
post #4 of 5 Old 05-25-2012, 09:55 AM - Thread Starter
AVS Special Member
 
Mike99's Avatar
 
Join Date: Sep 2004
Location: Illinois
Posts: 2,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked: 45
Quote:
Originally Posted by mungee View Post

Since I posted a similar question a week ago.

Other than your TV, Graphic card, AV reciever (does not apply to your case), Graphics card settings there are also setting in the BD/DVD players software that you can tweek to get to "ideal black" and "ideal white".

Also you might want to invest in a decent video calibration software if you are that picky about video quality. I use Disney's World of Wonder HD there are a few others out there.

I do have an Avia calibration DVD & do not have a problem displaying B-T-B with either of my two DVD players or the Blu-ray player. I don't recall the exact setting names & don't have the manuals in front of me at the moment, but all the players are setup to output the proper NTSC levels. They can all output B-T-B, but of course I don't have the HDTV calibrated for that. The HDTV is calibrated for the proper black level, at least as best as can be done with the calibration disc & other test patterns.

I do not want to display B-T-B with the HTPC, but am wondering why it cannot output such a signal. I an using the integrated Intel HD Graphics and am trying to find out what setting controls this.
Mike99 is online now  
post #5 of 5 Old 05-25-2012, 10:09 AM - Thread Starter
AVS Special Member
 
Mike99's Avatar
 
Join Date: Sep 2004
Location: Illinois
Posts: 2,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked: 45
Quote:
Originally Posted by Jon_R View Post

Could it be the output of PC range vs TV range?

0-255 (aka PC levels) and 16-235 (aka TV levels)

I'm new to hdmi having been on component for 5 years so it might not be relevant.

That's probably it, but how do I control this?

My secondary concern is what happens when I display jpeg photos. Will the HTPC change the 0-255 to 16-235, and what happens to the photo black levels when this happens?

I can plug an SD card into my Blu-ray player & look at photos.
Is their color space being changed to TV's safe 16-235 colors?
Is this the correct process for viewing on an HDTV because it is expecting 16-235?

I think I'll put a few jpeg test patterns on an SD card & view them on the HDTV using the HTPC and Blu-ray player and see what the blacks look like.
Mike99 is online now  
Reply Home Theater Computers

User Tag List

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