Sustainability of Digital Formats
 Planning for Library of Congress Collections

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Identification and description

Full name	ISO/IEC 15444-1:2004. Information technology -- JPEG 2000 image coding system -- Part 1: Core coding system, Amendment 1: Codestream Restrictions, Profile 3 (formal name); JPEG 2000 Profile 3 (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 2K presentations within the Digital Cinema Initiative's DCP_1_0. The restrictions include image size limited to 2,048 x 1,080 pixels, no more than one tile, 12-bit bit depth per component, no more than 5 decomposition levels, CPRL compression order, and maximum compressed bytes per frame (aggregate of color components) 1,302,083 (24 fps; 651,041 for 48 fps). Additional general information about JPEG 2000 profiles is provided in J2K_C Notes.
Production phase	Final-state content distribution by those who follow the Digital Cinema Initiative DCP_1_0 specification.
Relationship to other formats
Subtype of	J2K_C, JPEG 2000 Part 1, Core Coding System
Used by	MXF_GC_JP2, MXF Generic Container Mapped to JPEG 2000
Used by	JP2_J2K_C_Profile_3, JP2 File with JPEG 2000 Core Coding, Profile 3

Local use

LC experience or existing holdings	See J2K_C
LC preference	See J2K_C

Sustainability factors

Disclosure	Open standard.
Documentation	ISO/IEC 15444-1:2004. Information technology - JPEG 2000 image coding system: Core coding system, Amendment 1: Profiles for digital cinema applications (2006)
Adoption	Employed in the Digital Cinema Package (DCP_1_0) for theatrical distribution.
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; see also DCDM_1_0 and DCP_1_0.

Quality and functionality factors

Still Image
Normal rendering	See J2K_C
Clarity (high image resolution)	See J2K_C.
Color maintenance	See J2K_C
Support for vector graphics, including graphic effects and typography	See JP2_FF
Support for multispectral bands	Not relevant to this profile.
Functionality beyond normal rendering	See J2K_C and JP2_FF; see also DCDM_1_0 and DCP_1_0.

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=3	The profile indicator is the Rsiz value in the SIZ marker segment.

Notes

General
History

Format specifications

• ISO/IEC 15444-1:2004. Information technology - JPEG 2000 image coding system: Core coding system, Amendment 1: Profiles for digital cinema applications (2006)

Useful references