extract EXIF information from digital camera files

 EXIF stands for Exchangeable Image File Format, and is a standard for
 storing interchange information in image files, especially those using
 JPEG compression. Most digital cameras now use the EXIF format. The
 format is part of the DCF standard created by JEIDA to encourage
 interoperability between imaging devices. In addition to the standard
 EXIF fields, MetaCam also supports vendor-specific extensions from
 Nikon, Olympus, Canon and Casio.