RAW image file is minimally processed data from DSLR camera. Depending on photo camera’s manufacturer RAW files can be named with the following file extensions: arw, srf, sr2 (Sony), crw, cr2 (Canon), nef, nrw (Nikon), orf (Olympus), ptx, pef (Pentax), raw, rw2 (Panasonic/Lumix). Most of photographers use Windows or MAC OS image editors to convert RAW images into compressed images like JPEG, PNG or TIFF. At the same time there are several free but competitive software applications for the same purpose in Ubuntu Linux.

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