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12 Bit HDMI color output in Cat 14.6?

Discussion in 'AMD / ATI' started by Mussels, Jun 18, 2014.

  1. Mussels

    Mussels Moderprator Staff Member

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    I remember reading someone on the forums asking if 10 bit HDMI was even possible on modern graphics cards, and forgot about it until i saw this option in the new beta drivers.

    I get an 8, 10 and 12 bit color bit depth option, and the HDTV i use as a screen confirms its working.


    Anyone seen this before/knows more about it?

    [​IMG]
     
  2. R-T-B

    R-T-B

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    Last edited: Jun 18, 2014
  3. Mussels

    Mussels Moderprator Staff Member

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    thats on my 46" sony
     
  4. R-T-B

    R-T-B

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    I'll have to try it on my brand new Panasonic 39" LED/LCD HDTV and see what happens.

    Do you think there'd be a performance penalty to using this, similar to how 16bpp and 32bpp were back in the day?

    Also, some quick reading brings up some concerns on HDMI cable bandwidth actually CARRYING those colors.
     
  5. Mussels

    Mussels Moderprator Staff Member

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    i think its part of HDMI 1.4 specs, for greater color depth. may not make a difference if the panel cant support it, but i guess in theory better colors/gradients are possible?
     
  6. The Von Matrices

    The Von Matrices

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    One advantage of larger color space is the ability to natively view videos encoded in the High-10 H.264 profile, which is gaining traction due to its ability to produce better quality images at the same bit rate as 8-bit H.264 video.

    Counter-intuitively, for a given video bitrate, a higher bit depth and lower resolution is perceptibly better than a lower bit depth and higher resolution. There's a few good example frames of 10-bit vs 8-bit compressed video here, and a quick internet search will find many more such as this good example. Note the reduced macroblocks and banding in the 10-bit frames even when downsampled on an 8-bit display.

    There's a lot of anime being released in Hi10p because of this compression advantage.
     
    Last edited: Jun 18, 2014
  7. R-T-B

    R-T-B

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    Regardless of the ability of the cable to carry the colors (the HDMI 1.4 cert process from my reading is dubious at best, with many certified cables failing independent testing for even 1.3 standards), one thing is for certain:

    If your monitor is an LCD, you'll be lucky if you can get 8bpc (32bpp) out of it, let alone anything higher.

    Many LCDs still process colors above 18bpp using dithering internally, unfortunately. At least last time I checked.

    You can try a test if you want to feel bad about your monitor, mine flat our fails this one:

    http://battletech.hopto.org/html_tutorials/colourtest/

    Answer? Get a CRT, or realize that ignorance is bliss, and forget what I just told you.
     
  8. bubbleawsome

    bubbleawsome

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    My iphone actually did well on that test. o_O
    I do have the screen adjusted for red though. It shows a darker, warmer color.
     
  9. Mussels

    Mussels Moderprator Staff Member

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    my phone and TV show the same on that test (they're both IPS, makes sense) - the grey is solid, but the color gradients are smooth.


    edit: with brightness up i can see the three sections to the grey, actually. it could be just that i like my screens dim.
     
  10. AsRock

    AsRock TPU addict

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    It's even worse with mine it defaults to 8bit although maybe that's the AV or the AMD drivers not reading it right.

    My TV is 10bit.

    I rolled back to 14.2 a little while ago as 14.6 sucks for Arma 3.
     
  11. Xzibit

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    Its new to the 14.6 beta

     
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  12. AsRock

    AsRock TPU addict

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    Yeah i know some pretty much pointed that out already.. Maybe it work better when out of beta HAHA.
     
  13. R-T-B

    R-T-B

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    I wasn't aware of any panels that were actually 10bit and not just dithering... granted, I am an audo/video nut who has been out of touch for 3+ years, so I could be really really off on this, but just to satisfy my own curiousity, I'm going to be googling this tonight.
     
  14. Xzibit

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    They are probably unlocking the 8bit+ pipeline in GCN cards now that more monitors and affordable ones are using 10bit panels and higher then the norm sRGB is a selling point.

    You can now save some money and not have to buy a FirePro or Quadro to get 10bit.
     
  15. Mussels

    Mussels Moderprator Staff Member

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    my TV actually shows 12 bit (as shown in the photo) so clearly 12 bit inputs are a thing, even if the panels arent.


    online specs for my TV dont mention it whatsoever, and google is finding very little on the subject except a few conversations that seem to be "someone who knows a little bit talking to people who dont have a clue"
     
  16. R-T-B

    R-T-B

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    Pretty much what I got when I googled it as well... Leaves me thinking though that it probably isn't available at the panel yet, as the manufacturers tend to advertise the shit out of questionable features at any given chance (yellow color channel added to Sharp Aquos for example, nevermind conventional RGB not supporting it), how would they not advertise 10+bit color?
     
  17. Mussels

    Mussels Moderprator Staff Member

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    since mine defaulted to 10 bit, i'd have to assume 12 bit input w/ 10 bit IPS panel.

    apparently the HDMI 2.0 specs do 8, 12 or 16 bit, and thats about all the info i can find.
     
  18. R-T-B

    R-T-B

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    That or it's where the dithering shows the least banding. But anything is possible I suppose, there isn't much info either way.
     
  19. Aquinus

    Aquinus Resident Wat-man

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    Interesting. At some point I'll have connect my tower to my TV to see if deep color works. Theoretically my TV supports it as well but unlike yours, it doesn't tell you what the current color depth is and until now there wasn't really any way of choosing it.
     
  20. Mussels

    Mussels Moderprator Staff Member

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    mine tells me when i press the info button, its always showed 10 bit from my 7970, until now with these drivers (the first image in the thread is a PHOTO, not a screenshot)
     
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  21. Xzibit

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    What does your TV say when you un-check the Enable ITC processing ?
     
  22. Mussels

    Mussels Moderprator Staff Member

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    nothing changes.
     
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  23. AsRock

    AsRock TPU addict

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    I am just going by the manual but this is the only place it's referenced lol.
    [​IMG]
     
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