EXR Workflow Questions…

[Martin Wehding]

we are using exr’s in a r3d workflow for vfx shots. Try and set the colorspace in the write node in nuke to rec709 instead of linear.

[Teo Rižnar]

Rec709 in EXR out in Nuke will clip info and would not be the same like linear render and than lin-rec709 LUT. I will be doing similar thing soon. Will post my progress if I get somewhere 😉

Color grade reel: https://vimeo.com/15480583
Cofounder of https://nuframe.si postproduction

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[Jimmy Christensen]

Since when did Nuke clip info in Rec709?

[Timor Kardum]

Try to set the R3D in Davinci to “RedLogFilm” and then export to EXR.

To be hosest: i am not 100% sure this is correct, we are still checking it, but where quite successful with it so far.

We will now test ACES and open-colorIO, lets see where this leads us…

Timor

http://www.omstudios.de

[Frank Maier]

Had a similar issue with After Effects. In my case AE used a different Iso settings on the R3d files then Davinci. After dialing in the same value for the iso it was pixel-perfect…

[Jimmy Christensen]

Funny you should mention OpenColorIO. The new OCIO nodes in Nuke 6.3v7 actually clips (at 1.25) when going to rec709.
The normal colorspace converter in Nuke doesn’t clip anything when going to rec709.

[Adrian Brindle]

Hi Alexander,
Did you ever get a final answer to this?
I have exactly the same problem and we’re fairly sure we need a linear to SRGB Lut.
Or we need to get Resolve to read the file as linear.
Adrian

[Jonathan Berube]

Hello,

It seems I’m facing the same challenge. I’m trying to grade full CG frames rendered 16bit Half Float Open EXRs in Linear Color Space.

DaVinci Resolve will let me import and grade away but I’m unable to find the proper sRGB Display LUT for my viewer config.

Nuke’s viewer will do the proper Lin to sRGB display LUT conversion and so as RV but no sRGB LUT in DaVinci.

I guess most Colorists are outputting to Film or HDTV (Rec709) but my final out put is web.

Any hints on how to solve this?

-J

[Adrian Brindle]

I didn’t get any real resolution to my last post, no one offered a lut. (Still welcome if you have it)

What I did was import a scene into after effects which correctly scaled the shot.
I then exported this as a jpeg and imported it into resolve as a still.
I then used this still to build a grade on a node to correctly scale the shot in resolve.
I didn’t make this as a lut but I could of I suppose.
This approximation was my starting point and I applied this to all on a node. I then graded on separate nodes after this.
The results were fine and I seem to have access to plenty of latitude.
Bon Change

[Andreas Bravin karlsson]

I’m a Nuke compositor and do not know Resolve, but I find it really strange that a professional grading application does not have something as basic as a Lin to sRGB LUT. I’ve exported a LUT out of Nuke that I hope will do the trick for you:

lintosrgb.cube.zip

Let me know if you prefer a different format.

Andreas Bravin Karlsson
VFX Supervisor