I a week or so, I will get my life back (I am curerntly trying to get my kids of to college). If you wanted, you could send me a few frames of your movie and I can tell you if they can be keyed and how best to do it. Or at least offer some suggestions as to how to change your setup to be able to get a key in the future.
A poor low resolution grainy out of focus image will just not key. You need a good image to start with proper lighting. But, as I have mentioned before in other threads doing as much of your special effects "in camera" is the way to go. For sky, I have gone to the fabric store and purchased a few yards of blue fabric with a cloud pattern printed on it. These I streched over a sheet of foamcore board and placed these behind my set. They did not move, but they gave the right impression. I love fabric covered foamcore backgrounds for many reasons. They are light and easy to move. They are about the right size. They are fairly cheap, and you can get just about any color or texture you can imagine. You can than also modify the backdrop by adding elements with marker, paper, paint, ...
Last edited by FLL-Freak (January 18, 2009 (11:04am))