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Jhead is a command line driven program for manipulating the non-image parts of
Exif flavour JPEG files that most digital cameras produce.

It has the following features:
- Extracting camera settings from Exif image files
- Able to set and/or adjust the Exif time field
- Manipulation (extract, replace, regenerate) of Exif integral thumbnails
- Transplant Exif image header from one JPEG to another
- Edit JPEG comment fields
- Automatically rotate images upright (using jpegtran) according to
  "orientation" tag.
- Manage running programs on large batches of Jpegs and restoring Exif header
  information afterwards.
- Display embedded GPS info (if present)

WWW: http://www.sentex.net/~mwandel/jhead/