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How to remove edge on a “Alpha Invert Matte” ?
I am trying to key out the character so all that is left is his ground contact shadow. So I did a Alpha invert Matte on the beauty pass to cut out the character from the ambient Occlusion pass and then keyed it all onto a white solid. As you can see from my screen grab I am left with a fine hairline around the edge. What is the technique to remove this edge ?
I am guessing I should crush the levels on the Alpha of the layer I am using as a matte ? Is there a better approach ?
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4 Replies
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Use a Matte Choker
Tudor “Ted” Jelescu
Senior VFX Artist -
I would extend the alpha of the matte layer outward some using either matte>simple choker or channel>minimax set to maximum operating on the alpha channel.
This may eat into the contact shadow some in which case you could roto a copy of the matted ambient occlusion pass to bring it back.
Darby Edelen
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Thanks for responding. I ended up using this light wrap tutorial that someone posted.
https://maltaannon.com/articles/after-effects/ce-lightwrap/
Justin Mettam
PreViz & 3D-Generalist
mettam@hotmail.com
415 261-7633
https://mettam.wix.com/3dartist -
Years later and this helped me. Thanks. I used minmax with operation set to minimum and radius of 25 (depends on footage) and channel set to minimum
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