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 and ID3 meta information from JPG, JP2, TIFF, GIF, BMP, PICT, QTIF,
PNG, MNG, JNG, MIFF, PPM, PGM, PBM, XMP, EPS, PS, AI, PDF, PSD, DCM,
ACR, THM, CRW, CR2, MRW, NEF, PEF, ORF, RAF, RAW, SRF, MOS, X3F and DNG
images, MP3 and WAV audio files, and AVI, MOV and MP4 videos.  ExifTool
also extracts information from the maker notes of many digital cameras
by various manufacturers including Canon, Casio, FujiFilm, JVC/Victor,
Kodak, Leaf, 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/