JPEG 2000

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Revision as of 22:46, 28 July 2013

File Format
Name JPEG 2000
Ontology
Extension(s) .jp2, .jpf, .jpm, .mj2
MIME Type(s) image/jp2, image/jpx, image/jpm, video/mj2

JPEG2000 is standard that defines a wavelet-based raster image compression format, and a family of associated file formats, protocols, etc.

For details about specific formats, see:

Contents

Disambiguation

JPEG2000 is sometimes incorrectly used as a synonym for JP2. Although JP2 might be the most important part of the JPEG2000 standard, it is only one small part of it.

In some contexts, JPEG2000 is used to mean the compressed codestream format, instead of the whole standard.

Details

The JPEG2000 standard consists of many parts, including:

Format

The JPEG2000 file formats (JP2, JPX, JPM, and MJ2, but not the codestream format) use a hierarchical tagged format that is similar to RIFF. Unlike RIFF, the format supports objects larger than 4GB. It is also somewhat more streamable than RIFF, because it supports objects whose size is implied by the file size instead of reported in advance.

Identification

Most JPEG2000-related files (but not the codestream format) begin with bytes 00 00 00 0c 6a 50 20 20 0d 0a 87 0a.

Specifications

See also the articles about the specific file formats. Most of the official JPEG2000 specification is not freely available, but the committee drafts are. (Exception: Specifications for the high-level parts of the JP2 and JPX formats are freely available.)

Software

Sample files

Links

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