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adding external matte from embedded alpha channel

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Sherwin Akbarzadeh
adding external matte from embedded alpha channel
on May 3, 2013 at 3:24:02 am

Hi guys,

Just running some tests for a upcoming grade. The test material has been composited and exported as RGB + Alpha. We want to grade the 2 layers separately in Resolve 9 Lite.

I thought that I would be able to pull an external matte in Resolve from the Alpha channel within the clip. But all of the documentation I have seen including Juan Salvo's helpful tutorial https://vimeo.com/49029693 uses a separate file to create this external matte.

Just trying to minimise the number of files/legwork we have to deal with. Is there a way to do it my way ?

Thanks


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Juan Salvo
Re: adding external matte from embedded alpha channel
on May 3, 2013 at 4:00:18 am

You can use after effects for example to render that alpha as a matte and then use it that way,

I believe Resolve 9.1 respects alpha channels in prores 4444 files for titles and the like.

Thanks for the kind words Sherwin, good luck.

Colorist | Online Editor | Post Super | VFX Artist | BD Author

http://JuanSalvo.com


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Sherwin Akbarzadeh
Re: adding external matte from embedded alpha channel
on May 4, 2013 at 9:36:03 am

Thanks for confirming this Juan. All the best.


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Sherwin Akbarzadeh
Re: adding external matte from embedded alpha channel
on May 8, 2013 at 4:25:57 am

Hmmm... Just a follow up question:

How can I control the matte and the inverse matte seperately?

I have added a serial node and added matte and am able to control the matte layer separately. I would like to be able to do the same for the inverse matte. At the moment my adjustments of node 1 (below) affect the entire image.


I have tried going back to media and adding the matte layer twice to a clip and then selecting straight for one and inverse for the other but this is not giving me an inverse matte.

Thanks


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Johnathan Throbins
Re: adding external matte from embedded alpha channel
on Jul 31, 2014 at 5:36:55 am

you just have to click the invert button on the key input tab


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