Program for display and manipulate data contained in the Exif header of JPEG images from digital cameras. Things jhead can extract from an Exif jpeg file - 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 - Time and date picture was taken - Camera make and model - GPS info, if stored in image 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 - Re-name or date stamp fils according to exif timestamp - Transfer exif headers between images - Edit jpeg comments - Delete exif or comment sections from jpeg images