Exchangeable image file format

Exchangeable image file format (Exif) is a standard that specifies the formats for images, sound, and ancillary tags used by digital cameras, scanners and other systems handling image and sound files recorded by digital cameras. The specification uses the following existing file formats with the addition of specific metadata tags: JPEG DCT (where DCT refers to the 1974 publication by N. Ahmed, T. Natarajan and K. R.

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