exiv2

About exiv2

From Debian's package description

Exiv2 is a C++ library and a command line utility to manage image metadata. It provides fast and easy read and write access to the Exif, IPTC and XMP metadata of images in various formats

Exiv2 command line utility to:

• print Exif, IPTC and XMP image metadata in different formats:
• Exif summary info, interpreted values, or the plain data for each tag
• set, add and delete Exif, IPTC and XMP image metadata from command line modify commands or command scripts
• adjust the Exif timestamp (that's how it all started...)
• rename Exif image files according to the Exif timestamp
• extract, insert and delete Exif, IPTC and XMP metadata and JPEG comments
• extract previews from RAW images and thumbnails from the Exif metadata
• insert and delete the thumbnail image embedded in the Exif metadata
• print, set and delete the JPEG comment of JPEG images
• fix the Exif ISO setting of picture taken with Canon and Nikon cameras

From Debian's description of the exiv2 package, under that package's license.