JPEG 2000 codestream
From Just Solve the File Format Problem
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| − | '''JPEG 2000 codestream''' (also known as '''J2K''', '''J2C''', or '''JPEG 2000 Part 1, Core Coding System''') is the wavelet-based compressed image format defined in Part 1 of the [[JPEG 2000]] standard. It may appear in a file by itself, | + | '''JPEG 2000 codestream''' (also known as '''J2K''', '''J2C''', or '''JPEG 2000 Part 1, Core Coding System''') is the [[Wavelet compression|wavelet-based]] compressed image format defined in Part 1 of the [[JPEG 2000]] standard. Both lossy and lossless compression are supported. |
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| + | It may appear in a file by itself, but it was designed to be embedded in [[JP2]] or another file format. | ||
== Format == | == Format == | ||
| − | A JPEG 2000 codestream uses a variant of [[JPEG]] format, with | + | A JPEG 2000 codestream uses a variant of [[JPEG]] format, with a nearly identical system of markers and segments. (Note that the container formats used by JP2 and other JPEG 2000 file formats are completely different.) |
== Identifiers == | == Identifiers == | ||
Revision as of 14:45, 10 August 2013
JPEG 2000 codestream (also known as J2K, J2C, or JPEG 2000 Part 1, Core Coding System) is the wavelet-based compressed image format defined in Part 1 of the JPEG 2000 standard. Both lossy and lossless compression are supported.
It may appear in a file by itself, but it was designed to be embedded in JP2 or another file format.
Contents |
Format
A JPEG 2000 codestream uses a variant of JPEG format, with a nearly identical system of markers and segments. (Note that the container formats used by JP2 and other JPEG 2000 file formats are completely different.)
Identifiers
There is no official filename extension, but .j2k and .j2c are commonly used.
| Format | LoCFDD |
|---|---|
| Core Coding System | fdd000138 |
| Core Coding, Lossless Compression | fdd000139 |
| Core Coding, Lossy Compression | fdd000140 |
| Core Coding, Profile 0 | fdd000194 |
| Core Coding, Profile 1 | fdd000196 |
| Core Coding, Profile 3 | fdd000211 |
| Core Coding, Profile 4 | fdd000213 |
| Core Coding, BIIF Profile | fdd000170 |
| Core Coding, NDNP Profile | fdd000192 |
Identification
Files start with bytes ff 4f ff.
Specifications
- ISO/IEC 15444-1
- ITU-T Rec.T.800: JPEG 2000: Core coding system (not free to download)
- JPEG 2000 Committee Drafts → fcd15444-1.pdf
Sample files
- http://www.openjpeg.org/index.php?menu=samples
- http://www.opf-labs.org/format-corpus/jp2k-formats/balloon.j2c
