ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

Dark border round masks

COW Forums : Adobe After Effects

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Harry Clegg
Dark border round masks
on Jan 24, 2012 at 1:13:18 pm

Hi
I'm coming across a problem while trying to pull a key from a not very well lit greenscreen shot. I'm employing the technique of using Keylight in its combined matte output mode to produce a black and white imnage which serves as an alpha chanel for my footage - I've placed it in the layer above my footage and set the track matte on the footage to Luma Matte. So far so good. The difficulty arises when I precomepose the layer I'm using as a matte and duplicate the layers inside this comp and use masks to tweak the keylight settings for different parts of the frame. This works fine apart from the problem that the masks create a dark border which is clearly visible in the keyed footage. Feathering the mask only makes matters worse. Any idea what's going on here and how I can work round this?



Return to posts index

Roland R. Kahlenberg
Re: Dark border round masks
on Jan 24, 2012 at 1:52:28 pm

Take a look at Refine Matte or one of the older matte chokers.

HTH
RoRK

Intensive AE & Mocha Training in Singapore and Malaysia
Adobe ACE/ACI (version 7) & Imagineer Systems Inc Approved Mocha Trainer


Return to posts index

Harry Clegg
Re: Dark border round masks
on Jan 25, 2012 at 10:54:38 am

Thanks for the suggestion, Roland. I've tried Matte Choker, Refine Matte and Simple Choker. They all turn everything outside my mask black and none of the choke controls seem to have any effect at all. I've tried experimenting with blend modes too but this hasn't worked either.



Return to posts index


Roland R. Kahlenberg
Re: Dark border round masks
on Jan 28, 2012 at 5:12:33 pm

Harry, try nesting the comp, then apply the matte tools.

HTH
RoRK

Intensive AE & Mocha Training in Singapore and Malaysia
Adobe ACE/ACI (version 7) & Imagineer Systems Inc Approved Mocha Trainer


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]