Things jhead can extract from an Exif jpeg file
 Time and date picture was taken Things jhead can modify in an exif jpeg file
 Up-right images according to rotation tag using jpegtran
 Re-name or date stamp files according to exif timestamp
 Edit jpeg comments (but not the Exif comments)
 Create new minimal exif header containing date and thumbnail The files coming out of a pretty much all Digital cameras are in the Exif flavour of Jpeg files. Exif files are for the most part Jpeg files, but start with a different header block, and contain additional data sections with camera settings, as well as a preview thumbnail picture as part of the Exif header. Many image browsers today make use of this integral thumbnail when browsing, while other browsers make their own thumbnails based on the image as a whole. Because I am interested in photography, I am always curious just exactly what settings my fully automatic digital camera actually did end up using. Back in 1999, when I originally wrote jhead, I couldn't find a program that would consistently display the settings, nor one that could be compiled into a simple executable. I have since added many more features to jhead, many of them the result of suggestions or code contributions. Though there are many programs out there now that canExif headers today, for many tasks, jhead remains the simplest and most effective tool for the job, especially if used for automated or scripted tasks. Sample jhead output: File name : 0805-153933.jpg File size : 463023 bytes File date : 2001:08:12 21:02:04 Camera make : Canon Camera model : Canon PowerShot S100 Date/Time : 2001:08:05 15:39:33 Resolution : 1600 x 1200 Flash used : No Focal length : 5.4mm (35mm equivalent: 36mm) CCD Width : 5.23mm Exposure time: 0.100 s (1/10) Aperture : f/2.8 Focus Dist. : 1.18m Metering Mode: center weight Jpeg process : Baseline The program also has a lot of other command line options for manipulating Exif files, such as options tothe date in the header, renaming image files, or coordinating running Jpegtran and Mogrify towhole directory trees of images. Here's the program files. Just right click and save as. For novice Linux/Unix/OS-X users: Don't forget to set the executable bit after downloading the pre-built executables. Type "chmod +x jhead" at a shell window after downloading it to do this. As of Oct 5 2020, Jhead is on github: The software is public domain. A program this small is not worth bothering restricting anybody with, and I'm tooto look into the ramifications of GPL or BSD licenses. Besides, I hope more people integrate this sort of functionality into their programs, free or not free. Got questions? Read the manual. If that doesn't answer your questions, you can contact me at: Ftpdmin A minimal install-free windows FTP server for ad-hoc file transfers Finddupe Identify and eliminate duplicate files. Useful when organizing other people's photos. Also check out my Home page, or my Woodworking website