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Shadows in after effects

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Drew wilson
Shadows in after effects
on Feb 28, 2011 at 1:44:04 pm

Hey everyone,

I have a question concerning alpha channels in after effects. I'm doing a intro to a television series and I want to incorporate shadow elements that will be practically shot against a vellum screen (like this video here http://www.blind.com/work/directors/chris-do/gap-sound-of-color/) but how would I key the white out and still maintain the soft edges? is it as simple as adding an alpha channel? any suggestions would be appreciated, cheers.

Drew Wilson
Director/Friend


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Dave LaRonde
Re: Shadows in after effects
on Feb 28, 2011 at 3:52:06 pm

Sorry, but your link leads to a dead end.

You'll want to run a test on this, but you ought to do what you seek by using the shadow-on-white video as a Luma Matte or Luma Inverted Matte, which creates opacity based on shades of gray.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Erik Waluska
Re: Shadows in after effects
on Feb 28, 2011 at 8:38:09 pm

If it's just dark shadows on white the easiest way is to just switch the blending mode to multiply, which will drop out all of the white while keeping the soft edges. Dave's suggestion would be best if you need to use the shadows as a matte for another layer.


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