[Michael Hadley] “the problem areas (a woman’s hair with green spill).”
A quick suggestion about keying “problem areas” (and forgive me if you already know this) is to treat them as separate areas and not try and find a global key that works across the whole frame.
So make a soft edge mask to include the majority of the key and then invert the mask to use on a separate layer for the problem section – it’s almost always hair but it could be anything, like colours that are a bit too close to the background.
With hair you want a much higher degree of transparency on the edge than you want or need elsewhere (and probably a different approach to spill suppression as well) and this is really the only way to achieve it properly.
Also if you are trying the key with the FCPX keyer do have a look at the Edge tool which helps with quite a few issues. The lightwrap works very well also and can make a big difference and again is going to be useful for hair detail in a lot of cases.
The other thing which I’m sure you know is to use a garbage matte to eliminate as much of the background as possible so you’re not trying to key unnecessary areas.
Simon Ubsdell
http://www.tokyo-uk.com