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Keylight Help
Several issues have arisen including added noise and a white outlines around our subjects when we pull keys, regardless of our efforts. Any advice? For reference see pictures.
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1 Reply
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Hi,
(I know this is a Shake issue rather than After Effects, but since it’s here, here is where I’ll respond.)
Maybe I’m missing something, but shouldn’t your dilate/erode and blur nodes come after the key? with them in this configuration, you will send a blurred image to keylight which will not be easy to work with.
I almost never use Keylight to do the composite, preferring instead to let it create a matte that I then apply to the original footage using a switchmatte node. This allows me to modify the matte, adding or subtracting portions however I like before I apply it to the untouched original footage.
With the key you have set up here, for the garbage matte, I would be inclined to use one keylight node followed by a very strong erode filter which would then feed into a second keylight node. Pipe the footage into the main input of the second keylight and make a your basic key off of that. From the second keylight node, you should have a dilate erode node that erodes a small amount (or is it dilates? Anyway, a negative amount) This can then feed into a blur node to soften the edges a bit. And then from here use a switchmatte to connect it to the original footage.
Obviously you might want to do something a lot more complex, but that would be the basic setup.
Hope this helps,
Lars
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