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How to deal with fringing from a DV Chroma key?
Hello –
Im working with greenscreen footage for a school project in DV. I know that DV isnt the greatest source to pull a key from, but here I am anyways – and not without the related frustrations… Its p r e t t y close right now, except that I’m ending up with a white fringing at random problem areas…
Heres my (basic) workflow:
1. Create garbage mask (via autotrace) to choke greenscreen
2. Blur Chroma / Magic Bullet auto DV footage
3. Pull Chroma via Keylight
4. Feather mask
5. Nest scene into Master comp and apply Reelsmart MB to footageStep 4 and 5 help – but its really just a band-aid to the gushing problem of the white fringing on some of the edges. The problem is that its not uniform, so choking the matte just eats into other parts of the footage. Im stuck on how to deal with it (unless I want to be a roto-bot for the next 10 years…). Maybe the AE equivalent of a PS defringe filter?
Any advice on dealing with such issues? Grrr DV! Very appreciated!
John
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3 Replies
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Wow – quick response Dave, thanks!
I was using the deartifacter in Magic Bullet, but it wasn’t seeming to make much difference on this footage. I added the pre-blur which did help in some areas! I think that your idea for throwing some flecks into the background is also a good idea. Fortunately for me the footage is fairly quick moving, so when I push the motion-blur, it tends to hide some of those icky DV artifacts…
btw – I checked into DV Matte Pro, but it doesn’t seem to be made for AE7 and I don’t have FCP… 😛
Thanks for your expert help in the matter! Much appreciated!
John
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DV Matte Pro works fine in AE7,
but I’ve found I still get better results from keyLight on decent footage.
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Also, it’d be a good idea not to try to pull a clean key with only one iteration of keylight. I’d recommend creating an edge matte in which you have good detail around the edges but the matte isn’t entirely clean on the interior. Also create a core matte in which the edges are hard, but rolled back slightly from the edges of the ‘edge matte’ and the interior is entirely clean/solid. Then combine these two mattes for your final matte.
This may not solve your problem, but it is generally good keying practice =)
Although I think you mentioned that you tried using Matte Choker and it was chewing up some of the matte you wanted to keep, I might recommend trying it at a very minimal setting as well.
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