Files with the .RW2 extension contain raw files captured by the sensors of a Panasonic digital camera, they are a photographic equivalent of an analogue negative.

The files are RAW raster images saved in a way unique to the specific manufacturer, uncompressed, with a broad dynamic range. They contain a range of information that allows for the editing of photographic parameters, such as color and exposure, in a seemingly non-lossy manner, as the edited image can be saved, and the changes to the values can be reversed using graphic software.