JPEG 2000

JPEG 2000 (JP2) is an image compression standard and coding system. It was developed from 1997 to 2000 by a Joint Photographic Experts Group committee chaired by Touradj Ebrahimi, with the intention of superseding their original JPEG standard, which is based on a discrete cosine transform (DCT), with a newly designed, wavelet-based method. The standardized filename extension is .

jp2 for ISO/IEC 15444-1 conforming files and .
jpx or .
jpf for the extended part-2 specifications, published as ISO/IEC 15444-2.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

PIXCS

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