Thin white outline around garbage matte

Hi All,
I have a problem with a garbage matte rendering with a thin white line around it. Basically I've got 2 tracks of video. The bottom track is green screen footage, but its not a very clean key and some of the center of the image is being keyed away. So I put a copy of the footage on track 2 and used an 8 point garbage matte to keep part of the image intact. The garbage matte is keyframed throughout the clip. For whatever reason the matte has a thin white line around it when the sequence is exported. I'm attaching a stillframe to illustrate the problem. Anyone know why this is occuring?
Thanks,
Chris

I see no thin white line in that still image. Where am I supposed to be looking?
Wait, okay, you could have been morespecific what to look for or that we really needed to boost the magnification.
ONly visible when exported? Not visible in the timeline at the serquence settings?
As suggested, a feather will blend the two layers a bit better but you might end up with a feathered thin white line, too.
More specifics, what's the source footage format? What the sequence setting? What's the export format?
bogiesan

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Thin white outline around garbage matte

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