File Format and Code Stream
Similar to JPEG-1, JPEG 2000 defines both a file format and a code stream. Whereas the latter entirely describes the image samples, the former includes additional meta-information such as the resolution of the image or the color space that has been used to encode the image. JPEG 2000 images should — if stored as files — be boxed in the JPEG 2000 file format, where they get the .jp2 extension. The part-2 extension to JPEG 2000, i.e., ISO/IEC 15444-2, also enriches this file format by including mechanisms for animation or composition of several code streams into one single image. Images in this extended file-format use the .jpx extension.
There is no standardized extension for code-stream data because code-stream data is not to be considered to be stored in files in the first place, though when done for testing purposes, the extension .jpc or .j2k appear frequently.
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