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Blue screen keying in Resolve

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Yves Chauvel
Blue screen keying in Resolve
on May 6, 2014 at 6:14:43 pm

I'm currently using Arri Alexa Prores4444 LogC bluescreen footage shot in studio in Resolve 10 and can't get viable keyed results for compositing with track 1 just below keyed original. I tried different key mixers but results are not acceptable with some blue remaining around the model's blond hair.
I know this could be done with After Effets Keylight for example, but I don't know it well, and am afraid my LogC flat image will be lost when back in Resolve fo grading.

Any suggestion highly appreciated!

With thanks

BTW: All footage is shot HD@25fps (Europe).

Yves


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Juan Salvo
Re: Blue screen keying in Resolve
on May 7, 2014 at 2:48:21 am

Keying (compositing keying, not qualifiers) is rarely accomplished with a single key or even a single technique. Almost always what's required is multiple keys, masks, and other tricks to get a great result.

http://JuanSalvo.com
http://theColourSpace.com


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Sascha Haber
Re: Blue screen keying in Resolve
on May 7, 2014 at 8:41:14 am

Also you normally tweak the image toward keying in a separate path.
To pull a decent key from alexa you NEED to use the Alexa LUT as a minimum, they use Ultimatte, Keylight, Primatte or just Smokes Modular keyer (which is what I would do) and they generate your key.
Export that as a blackNwhite Prores file into resolve and do your grade..

A slice of color...

Resolve 10.1.0.021
Colorist / VFX / Aerial footage nerd
http://vimeo.com/saschahaber


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Yves Chauvel
Re: Blue screen keying in Resolve
on May 7, 2014 at 7:59:01 pm

I created different LUTs from the Arri website LUT generator and up to now have not been happy with them.
Keep on try next week when back in studio.

Thanks everybody!



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Andrew Shtern
Re: Blue screen keying in Resolve
on May 7, 2014 at 1:00:40 pm

Obviously the Resolve is a not compositing tool, and it's almost impossible to pull a clean and decent key and compose image over background. However, is you just need it clear enough for preview, you can use additional input node in your node tree (right click - Add Another Input), get Alexa LUT in it, tweak the bluescreen and key it out, and then pass the resulting key to Alpha Output (right click - Add Alpha Output), while feeding main output from your grade.

Andrew Shtern
Editor/Colorist
The Coffeepost @Kiev, UA


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Yves Chauvel
Re: Blue screen keying in Resolve
on May 7, 2014 at 2:52:54 pm

You are right, Andrew, Resolve is not a good compositing or keying tool. I 've tried many things but havent ad another input yet.
I'll try this as soon as I am back in studio, but I'm almost sure it won't make it, anyway!

Yves



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Stepan Ko
Re: Blue screen keying in Resolve
on May 10, 2014 at 11:26:07 pm

Second to last post in this thread from 2011 has some guidance for green screening in resolve.

http://forums.creativecow.net/thread/277/6676

It worked brilliantly for me!

All the best

Stepan


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