AVS HD 709 - Blu-ray & MP4 Calibration - Page 135 - AVS Forum
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post #4021 of 4024 Old Today, 11:45 AM - Thread Starter
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Originally Posted by sawfish View Post
I keep hearing about this levels round trip. Can anyone tell me how to demonstrate it? (I ask every time it comes up.) Is it just an AMD thing, or does it affect Nvidia and Intel, too?
I can only comment on my AMD card. Screen capture or the color cop progam can pull RGB values. The video and desktop will report as full-range, and that's the way the expansion setting has to be to stay in line with the 0-255 desktop. When the pixel format is set to the limited range it's clear that the pulled RGB values are not what's actually being output, and things are being put in the 16-235 range.

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In particular, if the end result preserves BTB and WTW, then the first leg of the round trip, the expansion from Video to PC Levels, is not losing this information, so if this is the case, it's not at all like actually outputting PC Levels, which loses this information.
I just tested, and Windows Media Player acts as if the full-range is being scaled back to the limited range, which means BTB and WTW are gone. I'm not sure what the DVD player I tried is doing, but the BTB and WTW are flashing. I would have to do a brightness comparison to guess and didn't have time.
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post #4022 of 4024 Old Today, 01:00 PM
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I have not read through the post nor the thread yet. So Im sorry if this question is asked a million times. I dont have time to read everything RIGHT NOW so I thought Id ask and maybe someone can spare me some time.


Do I have to download and burn out these programs? Is it not possible to run them on my computer and through a HDMI cabel to my TV calibrate?
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post #4023 of 4024 Old Today, 03:12 PM - Thread Starter
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Originally Posted by geearf View Post
As far as I know it's the same as the limited range, it's not available (yet?) :/
The only way I'm aware of to get a limited output for video and the desktop with an AMD card is to leave the video dynamic range on full and switch the pixel format to limited. The screens of those settings are shown at the following link, but it's the reverse of what they're doing:
http://www.avforums.com/threads/the-...hread.1474013/

For whatever reason the drivers I'm running seem to ignore the pixel format setting after a while and return to the default, but if this happens it should be somewhat apparent, and it would show up on the basic settings test patterns. That may just be an issue with my computer. If I had a display that couldn't accept full-range, I would try switching the pixel format setting to limited and see if that worked.
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post #4024 of 4024 Old Today, 03:16 PM - Thread Starter
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Is it not possible to run them on my computer and through a HDMI cabel to my TV calibrate?
The video can be played on a computer, but it depends on what you're intending to do if that makes much sense. It may or may not make sense to display the video with a computer. For people that want to watch Blu-ray movies from a disc player it generally makes sense to burn a disc.
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