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What is color profile 9-2-9?

I've just been taking some test clips on my iPhone 15 Pro using Apple log, prores with the Blackmagic app. Pulling them into FCP the info shows a color profile of 9-2-9. I have a rough idea of 4-4-4 and its subsets but can anyone enlighten me as to what 9-2-9 is? Just curious!

MacBook Air (M1, 2020)

Posted on Nov 27, 2023 4:15 AM

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Posted on Nov 27, 2023 7:19 AM

It's a color space metadata tag and of no real importance if you are simply importing images into FCP for grading and re-exporting into whatever color space you want. I've not used the Blackmagic iPhone app and I don't know if there are other options for tagging exports but I doubt it will matter. You are shooting Apple log and FCP should have no problem handling that.


The 9-2-9 tag basically indicates a Rec2020 color space (the 9s) with an undefined transfer function (the 2). Resolve uses these tags when exporting video and the most common ones are 1-1-1 (Rec709) 9-16-9 (Rec2020 P and 9-18-9 (Rec2020 HLG).


As W. Raider mentions, there has been and continues to be a lot of confusion about color space metadata tags and gamma shifts when exporting Rec 709 video from Resolve and how these files are read by FCP and Quicktime as well as problems when uploading to YouTube. Check out the Resolve forum if you want more info but prepare to be completely mind-boggled.




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Question marked as Best reply

Nov 27, 2023 7:19 AM in response to FilRmonic

It's a color space metadata tag and of no real importance if you are simply importing images into FCP for grading and re-exporting into whatever color space you want. I've not used the Blackmagic iPhone app and I don't know if there are other options for tagging exports but I doubt it will matter. You are shooting Apple log and FCP should have no problem handling that.


The 9-2-9 tag basically indicates a Rec2020 color space (the 9s) with an undefined transfer function (the 2). Resolve uses these tags when exporting video and the most common ones are 1-1-1 (Rec709) 9-16-9 (Rec2020 P and 9-18-9 (Rec2020 HLG).


As W. Raider mentions, there has been and continues to be a lot of confusion about color space metadata tags and gamma shifts when exporting Rec 709 video from Resolve and how these files are read by FCP and Quicktime as well as problems when uploading to YouTube. Check out the Resolve forum if you want more info but prepare to be completely mind-boggled.




What is color profile 9-2-9?

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