CompuServe Messages

OK..this is the intent : I have a video segment (300-600 frames) that I've captured as sequential TGA's. The video is of a man against a blue chroma background. As the man walks around you can see a dark shadow against the floor and against the back wall (all blue remember!)..I want to compositie this man into a Three Dimensional world – Replacing the chroma background with a 3D animation. The shadows need to be 'captured' and placed on the new 3d Background. I have done some tests with Adobe Premiere and *its ChromaKey* does it perfectly – except, premiere is an absolute dog at handling full color 24 bit images (esp. a large sequence of them). ANY IDEAS ?