contrast shift when exporting at 10 bit

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carton61

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  • Joined: Thu Jul 26, 2018 10:54 pm
  • Real Name: Wylie Rush

contrast shift when exporting at 10 bit

PostThu Jul 26, 2018 11:17 pm

Hi,

I have Davinci Resolve 14, and an Imac 5k retina computer. (I also have a 1080p Eizo monitor, but I think the types of screens are irrelevant to this problem. Though the mac hardware might be relevant.) In Resolve, when I deliver as an xml by exporting the video files at 8 bit uncompressed RGB (full color spectrum), all the colors in Adobe Premiere look exactly as they do in Resolve. (I am unable to tell you what they look like if I export directly to a file, because the codec used by Resolve for an 8 bit uncompressed RGB export is unreadable by quicktime.) In Resolve, when I deliver as an xml by exporting the video files at 10 bit uncompressed RGB (full color spectrum), the video file has very noticeable increased contrast (lights much brighter, darks a little darker) in Premiere. When I export the video from Resolve directly to a file using the Prores 4444 or 4444 xq codecs (full color spectrum), the same thing happens: the video file has the exact time amount of increased contrast (lights much brighter, darks a little darker). As the original files are RED R3D files, I'm assuming the Prores 4444 and 4444xq exported files are either 10 or 12 bit files.

My question: why is it that when delivering/exporting from resolve at 10 bit (either as a quicktime file or as an xml to be opened in Premiere) do I get this increased contrast? But when delivering/exporting at 8 bit, the colors and tones match perfectly.

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Wylie
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Hector Berrebi

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Re: contrast shift when exporting at 10 bit

PostFri Jul 27, 2018 4:50 am

carton61 wrote:My question: why is it that when delivering/exporting from resolve at 10 bit (either as a quicktime file or as an xml to be opened in Premiere) do I get this increased contrast? But when delivering/exporting at 8 bit, the colors and tones match perfectly.

Regards,
Wylie



Hi Wylie

Just checked, and you're right.
This has to do with how Resolve deals with the file's Data levels when Auto is selected at export.

It seems Resolve interprets both formats differently. 10 bit is exported at Video levels on Auto while 8 is at data. if you check Full for the 10 bit export it will look like the 8 at Auto, and if you check Video for the 8 bit it will look like the 10 at Auto.

Instinctively It feels wrong, I'd expect both to be treated equally at Auto, however, instinctively it also feels wrong to me to even use uncompressed RGB videos in my workflows :)

Why do you need uncompressed RGB files?
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