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Keying question

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Booey Mittelstadt
Keying question
on Jul 21, 2012 at 4:56:22 pm

Hi all,
I am a current film major at school, and very new to after effects. I was wondering if any of you could help me out with a simple green screen/keying question. I would like one clip of footage behind my subject, and different footage inside the outlines of the subject. Is this possible and if so, how? Thanks.

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Angelo Lorenzo
Re: Keying question
on Jul 22, 2012 at 12:21:49 am

Effect > Channels > Invert effect. Set the invert to "alpha".

Angelo Lorenzo
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John Cuevas
Re: Keying question
on Jul 22, 2012 at 5:04:09 pm

Another way to do it would be to set up your key. Make that the top layer of your composition. Place the layer you want to fill your alpha as the layer below and set it's track matte to alpha. Now your fill layer will use the layer's above alpha channel as it's own alpha channel.

Lastly place your background as the bottom layer.

Johnny Cuevas, Editor

"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.

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