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Working with prores for VFX - having problem with clamped whites

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Calvin Romeyn
Working with prores for VFX - having problem with clamped whites
on Jul 27, 2015 at 9:43:49 pm

I'm shooting a VFX heavy short-film with the Black Magic 4K Production camera.

I shot some tests using prores 422, but when I bring the clip into Nuke (or Premiere, or After Effects), all my highlights are clamped at 1, instead of having range beyond white.

I also tried using prores QTs from other people's BM cameras, same problem. So it can't be my camera.

I have a feeling I'm doing something wrong in my workflow.

Are prores Quicktimes only meant to be used in Final Cut and then exported as a DPX sequence? I tried viewing them on a PC and a Mac, but I don't have Final Cut. I was hoping to edit everything in Premiere Pro, then export DPX sequences to do the VFX

Anyone experienced this problem with having no dynamic range with Prores QTs?


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Chris Wright
Re: Working with prores for VFX - having problem with clamped whites
on Sep 12, 2015 at 11:53:25 am

Adobe CinemaDNG @ 2.5K RAW
Apple ProRes Log 4:2:2 HQ @ 1080 "Film" (log) or "Video" (Rec. 709) gamma.
Avid DNxHD @ 1080 "Film" (log) or "Video" (Rec. 709) gamma.


here's the 3 modes. if you selected rec709, there is no beyond white, its burned in. if you selected log, its stuck in there
as needing a log to linear lut called a BMD film log lut in Resolve. I like captain hook's grading luts myself.
http://www.captainhook.co.nz/blackmagic-cinema-camera-lut/


I made a LUT similar to BMD lut that you can use in AE.
https://f1.creativecow.net/9256/bmd-film-raw-to-log-64-emulator


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