1080p RGB (Full Range) 8/10-bit + HDR?

Discussion in 'Displays' started by Monstieur, May 18, 2018 at 6:44 AM.

  1. Monstieur

    Monstieur Limp Gawd

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    1. Does any TV support 10-bit RGB full range at 1080p? So far I have only seen 10-bit in YCbCr444 with limited range even at 1080p - RGB was always locked to 8-bit.
    2. Is HDR metadata even compatible with RGB, or does it have to be YCbCr444 with limited range?

    This is for desktop usage / gaming at 1080p and not 4K movies (where it's better to switch the display to 4K@60 10-bit YCbCr420 anyway).
     
  2. Armenius

    Armenius [H]ardForum Junkie

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    There is effectively no visual difference between RGB and YCbCr444. In the HDMI specification YCbCr is the only way to transmit 10- and 12-bit color, which is why RGB is limited to 8-bit on televisions. YCbCr doesn't require as much bandwidth as RGB.

    The way YCbCr is encoded means that brightness values below 16 and above 235 are used for footroom and headroom, meaning YCbCr will always be "limited" range. This is because YCbCr is calculating the difference in brightness from the red and blue signals instead of getting absolute values in each color channel. Some devices have a "superwhite" function that extends the brightness range from 16-235 to 16-240. If your graphic driver settings are set appropriately then you won't get any clipping errors such as black crush as the brightness values are appropriately translated when decoded.

    HDR can be transmitted using RGB with monitors that support it. You're not going to find it in any television, though.

    Most games actually have their LUT baked for limited range, especially if there is a console version. You can read more about that here:
    https://reshade.me/forum/shader-presentation/2948-extended-levels-w-b-point-histogram-port
     
  3. Monstieur

    Monstieur Limp Gawd

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    I'm worried about YCbCr444 in desktop applications like the browser. In 8-bit mode, will it cause more banding than RGB full range? I assume in 10-bit mode it will be a non-issue, but what if the application is only 8-bit aware?
     
  4. Monstieur

    Monstieur Limp Gawd

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    HDMI 2.0 adds RGB 10-bit and 12-bit.