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Matching URSA Mini 4.6k FILM Mode 'Log'

Derek Abel
 

Hi all!

I shot some footage with the URSA Mini 4.6k in 'FILM Mode'.
I have a Nuke artist compositing and integrating the live action footage with a CG environment.
I need to know if 'Log C' is a close enough match to BM URSA Mini 4.6k 'FILM Mode' or if there is a different option we should use (in Nuke or otherwise).

As for a colour space, I'm guessing REC2020 is the colour space we should be using.
I just want to know if you have any tips for us regarding setting up a Nuke project to work with BM URSA Mini 4.6k 'FILM Mode'.

Look forward to your reply and thanks in advance.

Derek Abel
Filmmaker / Digital Content Creator
+61449534995
Sydney, Australia

www.DerekAbel.com
www.FocalRhythm.com

Sam Sheppard
 

If confused then just open it in Resolve and check the metadata using the METADATA tab in either the MEDIA or EDIT pages. They’re both Blackmagic products and there’s a COLOUR SPACE (Gamut) display in the METADATA tab.

 

Resolve LT should be sufficient for this task, and is free so no problems there for you.

 

I’m not sure why you want LogC but I assume it’s for use with presets or LUTs that require LogC as the input. If that’s the case then ‘No’, the BM ‘Film Mode’ curve is not close enough to LogC for LUTs intended for LogC to work correctly. Easy solution though: Just use RCM (Resolve Colour Management) to convert your material to LogC while checking the gamut of your material in Resolve. If you don’t want to have to render though then it’s fairly easy to create a BM(Film-Mode)->LogC LUT which you can use as the 1st process in Nuke.

 

Usually I would send Nuke Linear .exr files. But if LogC is how you prefer to work then great. Whatever gets the best results for you.

 

If you want to use the LUT-in-Nuke option but are having trouble creating one then I suppose I could create it for you this once (only because it literally takes 3 minutes if you have the necessary software & knowledge)

 

All the best,
-Sam

 

 

From: Derek Abel
Sent: 20 December 2017 10:06
To: cml-post-vfx-aces@groups.io
Subject: [cml-post-vfx-aces] Matching URSA Mini 4.6k FILM Mode 'Log'

 

Hi all!

I shot some footage with the URSA Mini 4.6k in 'FILM Mode'.
I have a Nuke artist compositing and integrating the live action footage with a CG environment.
I need to know if 'Log C' is a close enough match to BM URSA Mini 4.6k 'FILM Mode' or if there is a different option we should use (in Nuke or otherwise).

As for a colour space, I'm guessing REC2020 is the colour space we should be using.
I just want to know if you have any tips for us regarding setting up a Nuke project to work with BM URSA Mini 4.6k 'FILM Mode'.

Look forward to your reply and thanks in advance.

Derek Abel

Filmmaker / Digital Content Creator
+61449534995
Sydney, Australia

www.DerekAbel.com
www.FocalRhythm.com

 

Paul Curtis
 

On 20 Dec 2017, at 07:47, Derek Abel <derek@...> wrote:
I need to know if 'Log C' is a close enough match to BM URSA Mini 4.6k 'FILM Mode' or if there is a different option we should use (in Nuke or otherwise).
Are you opening up the DNGs directly in Nuke? Or is it ProRes direct in Nuke?
Or supplying footage to Nuke from something else?

I doubt you could pretend the BM URSA was LogC within Nuke, you'd need some kind of input translation or LUT to linearise it properly.

If you're supplying files to Nuke from Resolve then the intermediate is up to you, that could be LogC or just exr files if you want to be technically lossless.

cheers
Paul

Paul Curtis, VFX & Post | Canterbury, UK

Derek Abel
 


Thanks Sam, the Nuke artist reached the same conclusions.
I think we’ve got it sorted.

Thanks so much for your help, really appreciate it.


Derek Abel
Filmmaker/ Digital Content Creator
0449534995


On 21 Dec 2017, at 01:11, Sam Sheppard <sam@...> wrote:

Usually I would send Nuke Linear .exr files