Duplicated layers extends the edges of my image, help?

[Rolotilmase]

I spent alot of time re-fining the edges of my keyed out subject, however every time I duplicate my layer, it extends my edges by a fraction creating a black outline around my subject which grows larger with each copy.  Shouldn't the duplicate be exactly like the original?  How do I fix this?

[Roei Tzoref]

this is normal because of anti-aliasing (semi transparent pixels) around the edges. please explain what are you trying to accomplish so we may give you workflow advice. if needed, show some screenshots.

[P.M.B]

Have you tried pre-composing the layer & duplicating the composition?   It seems reasonably logical that a duplicated layer would be identical but After Effects does everything halfway & backwards so....I wish I could give more advice but I don't have a ton of experience with keying.

[P.M.B]

Ha. You see.  It's normal.  LOL

[Kevin-Monahan]

Hi Rolotilmase,

Are you still facing this problem? If not, let us know how you solved it. If so, please let us know so we can assist you further.

Thanks,

Kevin