CHDK raw
From Just Solve the File Format Problem
If you are running CHDK on your compatible point & shoot camera, you can get it to shoot in RAW format. It's important to know that the word "format" is used loosely here- every camera has its own format, which is dumping the sensor input into a file. See: CHDK RAW
The CHDK wiki points to this thread as the reference on working with RAW files from CHDK-enabled cameras: CHDK Forum RAW for Beginners
Also it should be noted that CHDK seems to generate files with the CRW extension, albeit they have nothing to do with Camera Image File Format files.
