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Intersecting layers with alpha produces strange line

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Jack Everitt
Intersecting layers with alpha produces strange line
on Jul 17, 2009 at 8:46:39 am

Hi,

I have a problem with Motion when two layers intersect. On layer is totally opaque, and the second layer has transparent areas. The problem occurs in areas when the transparent areas intersect with opaque areas. In those regions I get a dark gray line appearing.

Check out this image and you will see what I mean.

http://jack.fxhome.com/MotionLine.jpg

Note: I get this unwanted line in the exported frame as well.

Why does motion do this?

Is there anyway around this?

Thanks

My website - http://jackeveritt.com


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Arnie Schlissel
Re: Intersecting layers with alpha produces strange line
on Jul 17, 2009 at 2:31:38 pm

I think that this is a premultiplication error. Open up the media tab, select that clip, then in the inspector, change the premult setting until the line goes away.

If it doesn't go away, it's an aliasing error. In that case, you'll need to blur the alpha slightly, maybe 1 or 2%.

Arnie

Post production is not an afterthought!
http://www.arniepix.com/


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