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The Joint Photographic Experts Group (JPEG) format is a commonly-used lossy image format.


JPEG files consist of a well defined header, some metadata, and a well defined footer. The header is usually FF D8 (hex).

Common file extensions are .jpg, .jpeg, .JPG, .JPE, and .jfif.


JPEG files can contain lots of metadata in several formats: Exif, IPTC, GPS, Camera Raw etc. The jhead command line tool, for example, can be used to extract and manipulate some of that metadata.

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