JP2
From Just Solve the File Format Problem
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JP2 is the baseline image file format defined by the JPEG 2000 standard. It encapsulates a JPEG 2000 codestream.
Contents |
Identifiers
| Format | PRONOM | LoCFDD |
|---|---|---|
| JP2 | x-fmt/392 | fdd000143 |
| JP2, Lossless | fdd000167 | |
| JP2, Lossy | fdd000168 | |
| JP2, Profile 0 | fdd000195 | |
| JP2, Profile 1 | fdd000197 | |
| JP2, Profile 3 | fdd000212 | |
| JP2, Profile 4 | fdd000214 | |
| JP2, BIIF Profile | fdd000169 | |
| JP2, NDNP Profile | fdd000193 |
Identification
JP2 files begin with bytes 00 00 00 0c 6a 50 20 20 0d 0a 87 0a ?? ?? ?? ?? 66 74 79 70 6a 70 32 20.
Note that some Adobe applications (most notably Adobe Photoshop) produce JPX (JPEG 2000 Part 2) images that erroneously use the above byte sequence, which makes them (superficially) indistinguishable from JP2 images.
Specifications
- ISO/IEC 15444-1 Annex I: JP2 file format syntax
- ISO/IEC 15444-1
- ITU-T Rec. T.800 (not free to download)
- JPEG 2000 Committee Drafts → fcd15444-1.pdf
- Updated ICC profile support, bit depth and resolution clarifications - 2013 amendment to the filespec that extends support of ICC profiles and clarifies use of resolution fields in JP2
- Updated ICC profile support, bit depth and resolution clarifications - August 2011 draft of above amendment (freely available)
- BIIF Profile for JPEG 2000
- JPEG 2000 Profile for the National Digital Newspaper Program (NDNP Profile)
Software
See also JPEG 2000.
- jpylyzer: JP2 validator and property extractor
Note also that the jpylyzer manual includes a detailed breakdown of the JP2 format structure.
Sample files
- Jp2k test corpus - annotated set of images, primarily intended to demonstrate specific preservation risks
- Jpylyzer test files - annotated set of images, primarily intended as test dataset in support of jpylyzer development. Includes many (deliberately) corrupted files.
- JPEG 2000 sample images - sample files for each format in the JPEG 2000 format family
Related formats
- GeoJP2 is an extension of the JP2 format which allows one to include geospatial metadata in georeferenced JP2 images.
Links
- Wikipedia:JPEG 2000
- Is JPEG-2000 a Preservation Risk?
- JP2 entries in OPF File Format Risk Registry - describes some issues with (older versions of) the format spec and issues with specific implementations
