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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 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 exif and jhead command tools can extract and manipulate some of that metadata.

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