Sustainability of Digital Formats
 Planning for Library of Congress Collections

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Identification and description

Full name	ISO/IEC 15444-1:2000. Information technology -- JPEG 2000 image coding system -- Part 1: Core coding system, Amendment 1, Codestream Restrictions (2002), Profile 0 (formal name); JPEG 2000 Profile 0 (common name)
Description	Implementation of JPEG 2000 Core Coding (Part 1) that constrains the use of variables in the specification ("restricts the codestream") to serve low-complexity applications, e.g., cell phones and other mobile devices. One key restriction limits image tiles to 128 pixels in each dimension; another limit (shared with profile 1) requires that the low resolution element in the image (LLD; the "D" is a subscript) also be 128 pixels in each dimension, facilitating the rapid construction of a thumbnail by most decompressors. Additional general information about JPEG 2000 profiles is provided in J2K_C Notes.
Production phase	See J2K_C
Relationship to other formats
Subtype of	J2K_C, JPEG 2000 Part 1, Core Coding System
Used by	JP2_J2K_C_Profile_0, JP2 File with JPEG 2000 Core Coding, Profile 0

Local use

LC experience or existing holdings	See J2K_C
LC preference	See J2K_C

Sustainability factors

Disclosure	Open standard. See J2K_C
Documentation	ISO/IEC 15444-1:2000. Information technology -- JPEG 2000 image coding system -- Part 1: Core coding system, Amendment 1, Codestream Restrictions (2002)
Adoption	The compiler of this document has not found information that characterizes the extent of adoption of J2K_C_Profile_0; Comments welcome.
Licensing and patents	See J2K_C
Transparency	See J2K_C
Self-documentation	See JP2_FF
External dependencies	See J2K_C
Technical protection considerations	See JP2_FF

Quality and functionality factors

Still Image
Normal rendering	See J2K_C
Clarity (high image resolution)	See J2K_C. It is possible that some of the profile 0 constraints would limit clarity; Comments welcome.
Color maintenance	See J2K_C
Support for vector graphics, including graphic effects and typography	See JP2_FF
Support for multispectral bands	Not relevant for this profile.
Functionality beyond normal rendering	See J2K_C and JP2_FF

File type signifiers

Tag	Value	Note
Filename extension	j2c	Extension for raw codestreams; see also JP2_FF
Internet Media Type	See note.	See JP2_FF
Magic numbers	See note.	See JP2_FF
Indicator for profile, level, version, etc.	Rsiz=1	The profile indicator is the Rsiz value in the SIZ marker segment.

Notes

General
History

Format specifications

• ISO/IEC 15444-1:2000. Information technology -- JPEG 2000 image coding system -- Part 1: Core coding system, Amendment 1, Codestream Restrictions (2002)

Useful references