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Forums Adobe After Effects How to remove edge on a “Alpha Invert Matte” ?

  • How to remove edge on a “Alpha Invert Matte” ?

  • Justin Mettam

    October 11, 2013 at 4:35 am

    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 ?

  • Tudor “Ted” Jelescu

    October 11, 2013 at 7:32 am

    Use a Matte Choker

    Tudor “Ted” Jelescu
    Senior VFX Artist

  • Darby Edelen

    October 20, 2013 at 4:02 pm

    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

  • Justin Mettam

    October 20, 2013 at 9:23 pm

    Thanks for responding. I ended up using this light wrap tutorial that someone posted.

    Justin Mettam
    PreViz & 3D-Generalist
    415 261-7633

  • Eddie Potros

    November 16, 2021 at 8:09 pm

    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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