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Intersecting layers with alpha produces strange line
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.
https://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 – https://jackeveritt.com
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1 Reply
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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!
https://www.arniepix.com/
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