I have a used a garbage matte to cut out a person in a white studio, the edge is feathered.
I've layered it over a white background.
WHY when I export this video, does the feather show up as a big grey band??!! (Can't see it on my edit monitors)
S Bedford, Western Australia
FCP 7.0.3, Mac OSX 10.6.6
2 x 2.8 GHz Quad-core Intel Xeon
6GM 800 MHz DDR2 FB-DIMM
I would be willing to bet that your white background isn't the same as the white background you are compositing over. Check in the video scopes. You might be able to see it there. What are you using for your background? If it is a FCP "Matte Color", use the eye-dropper to select the white in the video footage to get a better match.