ExifTool is a highly customizable Perl module and script that extracts
meta information from JPG, TIFF, CRW, CR2, THM, NEF and GIF images.
ExifTool can read EXIF, IPTC, XMP and GeoTIFF formatted data as well as
the maker notes of many digital cameras from various manufacturers
including Canon, Casio, FujiFilm, Minolta, Nikon, Olympus, Pentax, Sanyo
and Sigma.

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