Yes as Nick pointed out clamping the mattes could help if there are values
above 1.
also you could use keymix nodes with a soft edge & blurred roto to blend
your mattes so you don't see a seamline .


Cheers
*Shailendra*

On Fri, Mar 9, 2012 at 6:21 PM, Nick Pittas <[email protected]> wrote:

> Maybe you have bigger than 1 values in the matte after the merge. Try to
> clamp the values before you merge them and see if you still have the
> artifacts. And make sure they are still clamped after the merge.
>
>
> Nick Pittas
> moeffect
> VFX Supervisor
> Athens, Greece
> [email protected]
>
>
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