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Old 22nd March 2018, 17:07   #49769  |  Link
brazen1
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Join Date: Oct 2017
Posts: 331
I have a couple more things to add since some keen interest is popular at the moment: I have no intentions of introducing any sort of Ad nauseam.

Early drivers offered 8,10, and 12bit. The 10bit option was removed in recent drivers for RGB afaik. So now it's just 8bit or 12bit to select.

When using RGB 4:4:4 12bit @23Hz (matching old faithful Allied 2160p HDR test refresh rate) understanding this is a one shot deal since it's going to revert to 8bit after a reboot with newer drivers:

Manni has pointed out his display accepts 12bit and dithers to 10bit correctly with no banding and retains after a reboot. If I'm not mistaken, Manni is also using a custom 3Dlut and not passing HDR through.

It should also be noted, no amount of madVR processing to reduce banding artifacts has any affect at all. Nor does the dithering algorithm used.

When using YCbCr 4:2:2 10/12bit @23Hz there is NO banding.
When using YCbCr 4:4:4 10/12bit @23Hz there IS banding.
When using RGB 4:4:4 12bit @23Hz there IS banding.
When using RGB 4:4:4 8bit @23Hz there is NO banding.

So, is it better to lose 10bit using RGB 4:4:4 8bit @23Hz
or
use YCbCr 4:2:2 10/12bit @23Hz and gain back 10bit once the 12bit dithers down or when using 10bit? I don't mind recalibrating since YCbCr is limited only and no full.

At some point, I may work my way backwards in driver versions to find RGB that still offered 8,10, and 12bit choices so I can select 10 and see if banding is present or if I must still select 8bit to cure it. I'm not looking forward to doing that anytime soon though.

Lastly, Allied is a 2160p HDR title. Testing an SDR 1080p title, no amount of anything eliminates or reduces banding. A good example is 47 Meters Down 2017 at scene 42:00
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Last edited by brazen1; 22nd March 2018 at 18:24.
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