ExifTool is a highly customizable Perl script and module for reading and
writing meta information in images.

ExifTool reads EXIF, GPS, IPTC, XMP, GeoTIFF, ICC Profile and Photoshop
IRB meta information from JPG, JP2, TIFF, GIF, CRW, THM, CR2, MRW, NEF,
PEF, ORF and DNG images.  ExifTool also extracts information from the
maker notes of many digital cameras by various manufacturers including
Canon, Casio, FujiFilm, Kodak, Minolta/Konica-Minolta, Nikon,
Olympus/Epson, Panasonic/Leica, Pentax/Asahi, Ricoh, Sanyo and
Sigma/Foveon.

ExifTool writes EXIF, GPS, IPTC, XMP and MakerNotes meta information to
JPEG, TIFF, GIF, CRW, THM, CR2, NEF, PEF and DNG images.

WWW: http://www.sno.phy.queensu.ca/~phil/exiftool/