JP2

File Format
Name	JP2
Ontology	Electronic File Formats Graphics JPEG2000 JP2
Extension(s)	.jp2
MIME Type(s)	image/jp2
LoCFDD	fdd000143, others
PRONOM	x-fmt/392

JP2 is the baseline image file format defined by the JPEG 2000 standard. It encapsulates a JPEG 2000 codestream.

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.

However, if four bytes at offset 20 are not as shown above ("jp2 "), a JP2 decoder is still expected to decode the file if "jp2 " appears in the list beginning at byte offset 28.

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)

Software

See also JPEG 2000.

• jpylyzer: JP2 validator and property extractor

GeoJP2

GeoJP2 is an extension of the JP2 format which allows one to include geospatial metadata in georeferenced JP2 images.

Sample files

• JPEG 2000 sample 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