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