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Keying fringe problem, require assistance….
I am Visual Effects student working on a problematic HD keying shot, and would love some suggestions or solutions to my problem.
I first use a precomp consisting two of the same greenscreen plates ( a soft, and hard key ) to key the footage and generate an alpha. The key looks which looks fine and dandy against a test background at this stage. There are no colour corrections etc in this precomp.
But…. when I use this precomp ,in my main comp, as the track matte for the same footage, suddenly a white fringe appears. Not good!I can’t see why this is happening, does anyone have any ideas, or is it something simple I am overlooking?
Cheers
Aaron
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2 Replies
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why are you precomping your key? and if you need to precomp, why are you then bringing it into your main comp and using it as a track matte?
if you do need to precomp your keyed footage, you should just key it as you will, then bring that comp straight into your main comp – no need for track mattes as your keying will automatically provide you with an alpha…
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Just to explain why I was doing what I did… I precomped and track matted my keying work so that I could perform a cascading key (pull multiple keys to target problem area like hair etc that may need a different key from the main overall matte pull), and perfrom any matte choking etc on the greenscreen shot, keeping this set of operations wholly seperate from any colour processing etc.
However, putting the keys etc in the precomp and not doing the track matte thing results in it working perfectly, so I’ll go with that. Nice oneThankyou for your help and suggestions
Cheers!
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