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L
lucb87600251
Participant
January 13, 2019
Question

HDR REC2020 and SDR REC 709 mixed on a timeline

  • January 13, 2019
  • 1 reply
  • 2688 views

I have a timeline with mixed colorspace, some clip are HDR in REC2020 and some clip are in SDR REC709.

I export the timeline in x265 main10 HDR. HDR content look great on an HDR TV, but when SDR content is show it look really bad. White are almost grey and black look like charcoal. I would guest I would need manually tell Premier pro 2019 to expend SDR content to HDR color space. I'm I right? How could I do this.

Thanks.

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1 reply

R Neil Haugen
R Neil Haugen
Legend
January 13, 2019

HDR is a much broader color space especially for tonality. The number of data levels for brightness of the media is crucial.

Your SDR ... is that 10-bit or 12-bit media? If 8-bit, you have 256 levels between black point and white point. HDR needs more levels than the 8 bits of so much SDR media. So expanding 8 bits ... 256 levels... onto a sequence needing say 580 levels minimum means you will likely have significant banding issues for 8 bit clips.

In most usage, according to say the information provided by Light Illusions (company that provides most of the calibration gear and software for colorists)  ... the actual intent of HDR is NOT so much a brighter image overall, but the ability to retain detail in brights well above SDR media.

Much HDR media professionally produced is not that much "brighter" in the middle values. There are more details in shadows and whites.

Neil

Everyone's mileage always varies ...
L
lucb87600251Author
Participant
January 13, 2019

thanks for the great explanation.

video are in 8 bits h264, some are on 8 bits DNxHD, some are in 10 bits DNxHD. and even fewer are in Rec2020 x265.

this is a Barker channel and we want to showcase video in HDR to promote our HDR channel.

R Neil Haugen
R Neil Haugen
Legend
January 14, 2019

The 8 bit DNxHD might not be too ... bad, but I would worry about 8 bit H.264.

I can't see any way not to have banding with that media, stretching highly compressed H.264 256 levels across 500 nits or better against 10 bit media  ... so best wishes.

Neil

Everyone's mileage always varies ...
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