2000.10.04 15:02 "Re: BMP questions", by Peter Nielsen
Thanks - I'd been through those already, but there were a few questions that they (and the official documentation) didn't provide answers for, like the fill colour to use when you get a delta escape in an RLE compressed image.
AFAIK, the background color is undefined. The best you can do is to make the undefined area transparent. If that's not possible, then use color index 0 for bitcounts <= 8, or RGB(0,0,0) for bitcounts > 8.