The Joint Photographic Experts Group (JPEG) format is a
commonly-used lossy image format.
JPEG is a container file format that consist of a well defined
header, some metadata,
icons, a color table, compressed data, and a well defined
Common file extensions are .jpg, .jpeg, .JPG, .JPE, and .jfif.
JPEG files can contain lots of metadata in several formats, such
as Exif, IPTC, GPS, or Camera Raw.
The exif and jhead command tools can extract and
manipulate some of that metadata. Adroit Photo Forensics
can be used to extract, view and group metadata from JPEG and camera Raw files.