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Feather inside of mask versus outside of mask versus both inside and outside

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Robby Huang
Feather inside of mask versus outside of mask versus both inside and outside
on Jan 17, 2015 at 10:11:30 pm

I'm trying to feather a mask and make it only feather on the inside.

According to this page: http://helpx.adobe.com/after-effects/using/alpha-channels-masks-mattes.html, it says "By default, the feather width straddles the mask edge, half inside, and half outside. For example, if you set the feather width to 25, the feathering extends 12.5 pixels inside the mask edge and 12.5 pixels outside it."

But I can't see to find anywhere to alter this behavior. I know I can use the new variable feathering tool, but it would be an enormous pain to go back on this mask I already animated.

Any ideas? Thanks!


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Dave LaRonde
Re: Feather inside of mask versus outside of mask versus both inside and outside
on Jan 18, 2015 at 2:35:41 am

This could work for you:
Duplicate the mask. Play with the mask's expansion and both mask's modes: add, subtract, intersect, etc.

I have a feeling you'll have to reanimate. But at least you'll know it's best to establish the look with masks before you go to the trouble of animating.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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