jhead is a Exif Jpeg header manipulation tool. Things jhead can extract from an Exif jpeg file Time and date picture was taken Camera make and model Integral low-res Exif thumbnail Shutter speed Camera F-stop number Flash used (yes/no) Distance camera was focused at Focal length and calculate 35 mm equivalent focal length Image resolution GPS info, if stored in image IPTC header XMP data Things jhead can modify in an exif jpeg file Up-right images according to rotation tag using jpegtran Set or relative adjust internal exif timestamps Fix date / time offsets in large batches of images Re-name or date stamp files according to exif timestamp Transfer exif headers between images Replace thumbnails inside Exif headers Edit jpeg comments (but not the Exif comments) Delete exif or comment sections from jpeg images Create new minimal exif header containing date and thumbnail