Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| 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 PDAs (Personal Digital Assistants). 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) 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 |
| LC experience or existing holdings | See J2K_C |
| LC preference | See J2K_C |
| 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 patent claims | See J2K_C |
| Transparency | See J2K_C |
| Self-documentation | See JP2_FF |
| External dependencies | See J2K_C |
| Technical protection considerations | See JP2_FF |
| Normal rendering | See J2K_C |
| Clarity (support for 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 graphic effects and typography | See JP2_FF |
| Functionality beyond normal image rendering | See J2K_C and JP2_FF |
| Tag type | Value | Note |
| Filename Extension | j2c | Extension for raw codestreams; see also JP2_FF |
| Internet Media Type | See JP2_FF | |
| Magic numbers | See JP2_FF | |
| Profile indicator | 1 | Rsiz value in the SIZ marker segment. [Ought this have been 0, or ought the indicators for profiles 3 and 4 been 2 and 3?] |
| General | |
| History |
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