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Feature request for pre-grading purpose

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Jimmy Christensen
Feature request for pre-grading purpose
on Sep 14, 2012 at 12:07:38 pm

I have a feature request which I will send to Blackmagick but wanted to hear your ideas. Where I am, we do alot of grading on top of VFX work which is challenging when coming to colorspaces and neutralising. So here is my suggestion :

A new node in davinci which is 100% geared towards CDL values. Which means no keying options, not transform option etc. Only 3 different values :
Offset
Gamma
Gain
(We have seen problems with translating Saturation correctly)

And then the option to reverse it.

It will have 2 purposes :
1. If you want to generate CDL values it's impossible to go outside the box of CDL (idiot-proof)
2. When getting back VFX work which has the CDL values burned in, you can just use the reverse option.

This is the scenario I imagine :
1. Technical grading burned in to OpenEXR's given to the VFX artist which also transforms it into rec709 colorspace.
2. VFX work is done on top of the rec709 material back into rec709 OpenEXR's.
3. Grading takes the frames and have the option to take the old technical grading node and select the reverse option to get it back into the original colorspace (eg. Log-C).
4. Everyone is happy! :)

What do you guys think?


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Jimmy Christensen
Re: Feature request for pre-grading purpose
on Sep 14, 2012 at 12:10:16 pm

Btw. where is the best place to email feature request to Blackmagick?


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Sascha Haber
Re: Feature request for pre-grading purpose
on Sep 14, 2012 at 12:28:06 pm

That totally gets my vote :)
Yes please !!

A slice of color...

DaVinci 9b3 OSX 10.8
MacPro 5.1 2x2,4 24GB
RAID0 8TB
GTX 470 / Quadro 4000
Extreme 3D+

Colorist / Aerial footage nerd
http://vimeo.com/saschahaber


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Chris Martin
Re: Feature request for pre-grading purpose
on Sep 14, 2012 at 3:23:27 pm

Great idea!


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Teo Rižnar
Re: Feature request for pre-grading purpose
on Sep 15, 2012 at 8:06:09 pm

Very good idea, to get CDL in Resolve9!
But your workflow could have some problems. When going reverse with log-vid-lin you can get bad results. from r709->logC you can not get the original latitude of the footage. Rec709 in VFX is just for preview, you render back in LogC/cineon/linear... what was your original footage that came in VFX.

Color grade reel:
Cofounder of http://nuframe.si postproduction


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Sascha Haber
Re: Feature request for pre-grading purpose
on Sep 16, 2012 at 9:34:34 am

Not when using EXR...and he meant true linear, not video levels.

A slice of color...

DaVinci 9b3 OSX 10.8
MacPro 5.1 2x2,4 24GB
RAID0 8TB
GTX 470 / Quadro 4000
Extreme 3D+

Colorist / Aerial footage nerd
http://vimeo.com/saschahaber


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Jimmy Christensen
Re: Feature request for pre-grading purpose
on Sep 16, 2012 at 11:23:45 am

Not true linear (gamma 1.0) but rec709. Davinci doesn't really have any good way to convert from true linear to rec709. But yes with an OpenEXR workflow you won't clip the colors which are outside the "true" rec709 colorspace.


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Jimmy Christensen
Re: Feature request for pre-grading purpose
on Sep 16, 2012 at 11:20:34 am

Mind you that there absolutely no LUT's involved, since they can clip and are not reversible.

So forgot all about the standard LUT's. The whole point is that the CDL grading is to replace the logc->rec709 LUT completely. It's more the equivalent of the logc->rec709 found in nuke which uses an expression to do so and is 100% reversible. But since you cannot re-produce that particular conversion you take over that process in Davinci and include the neutralizing process as well which is good for VFX.


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