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toddp39531300
Participant
November 26, 2016
Question

HDR Export from Premiere Pro 2017 is flat

  • November 26, 2016
  • 3 replies
  • 9700 views

Hi.

Using Raw footage from my Red camera (and using Red gamma 4/Dragon color 2) I am seeing some weird issues when I export to HEVC.

I am trying to view the exported file with MPC-HC with MadVR plugin on an LG 31MU97-B 10-bit 4K DCI monitor on Windows 10.  I can't say for 100 sure that I have playback set up correctly, but here is what I am seeing.

The output looks flat like RAW or ungraded log when I export as HDR (HDR10).  At first I thought this might have to do with using the Rec 2020 primaries, but if I use the Rec 2020 color space, but not HDR, the exported video retains the expected color saturation.  When checking HDR (which requires Rec 2020) then I get the flat image.

I've tried demo files that are Rec 2020 and HDR10.  While my display can only manage 320 nits, it does appear to output 10-bit HDR content without problems.

Any suggestions would be great.  I'd love to see my Red footage in all its HDR glory without having to look just at raw files.

    This topic has been closed for replies.

    3 replies

    E
    excited_Genie16B8
    Legend
    November 26, 2016

    I did not find anything saying that display was HDR capable.  Perhaps it isn't?

    chrisw44157881
    chrisw44157881
    Inspiring
    November 26, 2016

    i don't believe so, that's why the lut transform from ST2084 to P3 is going to be really fun for him. i.e. a pain in the butt for a a specially calibrated LUT.

    for example, that monitor is capped out at 320 nits, which is 320cd/m^2. HDR is at least 1,000 going up to 10,000. dolby recommends 4,000. That monitor can do >93%DCI P3, it just won't have the contrast range or brightness necessary for grading hdr properly.

    http://www.dolby.com/us/en/technologies/dolby-vision/dolby-vision-white-paper.pdf

    T
    toddp39531300Author
    Participant
    November 26, 2016

    @Chris thank you for the links.  I've read a lot about HDR, but these are quite concise and make a good primer for anyone trying to make sense of the HDR world.

    It's ironic because I've been shooting Red raw 16-bit and using an ACES workflow, so with capture and editorial I know that I'm getting and retaining all of that great luminence and color data.  Outputting to 8-bit rec 709 is quite easy.  It's only when I want to embrace HDR that things get complicated.  By HDR I'm just talking about HDR10, not Dolby Vision.

    My current monitor can do 10-bit 4:4:4 color.  At only 320 nits, it's a fraction of the current HDR10 target, but my understanding is that HDR really helps in the highlights.  Thus if I saw the highlights were clipped, for example in a sky with clouds, then it would make sense - not enough nits.  But what I get is a bit different.  If I output to the rec 2020 color space, everything looks great.  So it's not about the color space.  When I enable HDR on export, then I get the log-like image.  I this case it's a night scene of a sidewalk with some practical lights.   In this case I expect the blacks to still be black.  Excuse my ignorance, but I'm missing something.

    As for grading, I did recently order an LG 55E6P OLED TV.  They say that it's an HDR TV, even though it can only produce around 660 nits (are there any that can hit 1000 nits yet?) and only about 97% of P3 (~60% of 2020).  It should arrive Tuesday, so I'll be quite interested to see how well it performs after calibration.

    R Neil Haugen
    R Neil Haugen
    Legend
    November 26, 2016

    HDR video... I'm expecting you understand  ... isn't at all the equivalent of HDR still photos.

    I've been following the work of several colorists as they prepare their suites and gear to handle this. It's a complete new game, and not totally gear ready in some ways.

    So  ... the reference monitor you grade on needs to be able to handle the range  ... is just the beginning.

    Neil

    Everyone's mileage always varies ...
    chrisw44157881
    chrisw44157881
    Inspiring
    November 26, 2016

    in the meantime, while you wrap your head around inverse lutting a new technology,

    you can use SDR Conform to convert your HDR video to SDR for playback on non-HDR devices.

    chrisw44157881
    chrisw44157881
    Inspiring
    November 26, 2016

    both the HDR10 and dolby format use Rec 2020 and ST2084 which do indeed look like LOG.

    I don't have a definite answer for you right now as I am actually working on a LUT

    transform myself with dispcal. You need to match up the white point, white level(nits), black level, gamma curve rolloff, etc.

    what is your monitor calibrated to? Adobe RGB or P3 D65?

    http://files.spectracal.com/Documents/White%20Papers/HDR_Demystified.pdf

    http://www.lightillusion.com/uhdtv.html

    examples

    OpenColorIO-Configs/aces_1.0.1/luts at master · imageworks/OpenColorIO-Configs · GitHub

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