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

Jhead program features:

 - Extracting camera settings from Exif image files

 - Able to manage running programs on large batches of Jpegs and
   restoring Exif header information afterwards.

 - Able to set and/or adjust the Exif time field

 - Removing of integral Exif thumbnails for compacting Jpegs without
   loss of other JPEG header info

 - Transplant Exif image header from one JPEG to another

 - Save integral Exif thumbnails as separated images

 - Edit JPEG comment fields

 - Automatically rotate images upright (using jpegtran) according to
   "orientation" tag.

 - Display embedded GPS info (if present)
