Late 2015 27" iMac - Is is a 10-bit display?

Discussion in 'iMac' started by PowerMike G5, Oct 19, 2015.

  1. PowerMike G5 macrumors 6502

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    #1
    Can anyone chime in on this? I'm curious... with a new P3 gamut display, is the panel showing up as 10-bit color? Or is it still being used at 8-bit?

    I can't find any information on this at the moment.
     
  2. mikeboss macrumors 65816

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    #2
    I'm pretty sure Apple would have mentioned it if it were 10bit. besides, AFAIK OS X still doesn't support 10bit color.
     
  3. PowerMike G5 thread starter macrumors 6502

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    #3
    Thanks. That's what I suspected, but wanted to hear from others. It's too bad, considering all these 10-bit video camera systems with wide gamut recording options now.
     
  4. jerwin macrumors 65816

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    #4
    Screen Shot 4.png

    Not quite sure what CGSThirtyBitColor actually means in the real world. The S211H is by most measures, a pretty crappy display, and I'd be surprised if it was 10 bits per channel. Does DVI support more than 8 bits?
     
  5. PowerMike G5 thread starter macrumors 6502

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    #5
    Thanks a lot for the screen grab!

    Really interesting... according to that, it suggests that it is indeed 10-bit color. Every other Retina screen on macs till this were designated at 32-bit, but parsed out as 8 -bits per channel, including an alpha channel. Your screenshot seems to possibly indicate actual 10-bits per channel, since there is no other calculation to amount to thirty bit color other than 10-bits per RGB channel.
     
  6. jerwin macrumors 65816

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    #6
    The thing is-- I'm running a first generation retina iMac. So maybe it's a El Capitan thing.
     
  7. mikeboss macrumors 65816

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  8. PowerMike G5 thread starter macrumors 6502

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    Thanks. So it seems hardware is capable, but the OS and/or application needs to send it the signal?

    I get 10-bit color depth out of my AJA video I/O PCIe card to a 10-bit monitor. But it would be lovely if we can also get it from the GPU onto the computer monitor itself. I won't have to turn my head so much back and forth with color grading!
     
  9. mikeboss macrumors 65816

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  10. mikeboss, Oct 23, 2015
    Last edited: Oct 23, 2015

    mikeboss macrumors 65816

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  11. hifimacianer macrumors member

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    #11
  12. mikeboss macrumors 65816

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    #12
  13. hifimacianer macrumors member

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    #13
    Great, thank you!
    I'm also in the final decision for the 5k iMac, and your BTO (M390, i7) is one of the options I'm looking for.
     
  14. PowerMike G5 thread starter macrumors 6502

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    #14
    Thanks for sharing. So it looks like 10 bit is here! (at least at the hardware level). Assuming OS X supports it at this point, I assume software have to be modified to recognize this?
     
  15. ericv macrumors regular

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    #15
    I'm not familiar with monitors, why is 10 bit better than 8 bit. I understand bits, what does 10 bit give me?
     
  16. Kappsi macrumors newbie

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    #16
    More colors.
    On an 8-bit display, the number of possible colors per pixel is 2^8 * 2^8 * 2^8 (ignoring alpha at the moment) = 2^24 = 16,777,216 (16.7 million). On a proper 10-bit display, the number of possible colors is 2^10 * 2^10 * 2^10 (again, ignoring alpha atm) = 2^30 = 1,073,741,824 (just over a billion), or 64 times as many possibilities as the 8 bit panel. More practically, it means 1024 shades of a color (or shades of grey), as opposed to 256, which helps prevent the weird banding you see in gradients of grey.

    The reality is, very little supports full 10 bit, and most 10 bit displays don't really support that full billion possibilities. Including this iMac, which doesn't claim to be a proper 10 bit display.
     
  17. ericv macrumors regular

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    #17
    Hasn't Apple been staying the iMac has 16.7M colors?
     
  18. mikeboss macrumors 65816

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  19. MRrainer macrumors 6502a

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    #19
    Yup, it's the real thing.
    Currently, you can only view these 10bit in Preview and in the "Edit" mode of Photos, apparently.
    (Which is what the article says)

    I don't have a new iMac. But I trust heise.de ;-)

    Any bets how long it will take before Adobe picks it up in one of their apps?
    ;-)

    That said, there seems to be no mention of it in the developer-documentation (that heise could find).
     
  20. mikeboss macrumors 65816

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  21. PowerMike G5 thread starter macrumors 6502

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    #21
    This is excellent news! I think for viewing for the majority of folks, 8-bit is fine. For someone like me who works in media and works with 10-bit (and 12-bit) video sources, it's really nice having this. Even though I output with an AJA I/O card in true 10-bit to a 10-bit monitor, being able to grade within UI of my programs on the mac monitor was something I've been looking forward to for a while.
     
  22. C64 macrumors 65816

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    #22
    Haha, that file looks sooo terrible on my MBA :')
     
  23. jerwin, Oct 24, 2015
    Last edited: Oct 24, 2015

    jerwin macrumors 65816

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    #23
    I'm thinking that if you have manually calibrated your displays in the past, now might be a good time to recalibrate them. (Remember to hold down the option key while pressing the "Calibrate..." button.)
    one advantage of 10 bit color is that adjusting the gamma on the computer will result in less banding.
     

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