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 1 (formal name) JPEG 2000 Profile 1 (common name) |
| Description | Implementation of JPEG 2000 Core Coding (Part 1) that constrains the use of variables in the specification ("restricts the codestream") but has been designed to serve most commercial applications. One restriction limits image tiles to 1,024 pixels in each dimension; another limit (shared with profile 0) 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_1, JP2 File with JPEG 2000 Core Coding, Profile 1 |
| 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_1; 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 albeit unlikely that some of the profile 1 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 | 2 | Rsiz value in the SIZ marker segment. [Ought this have been 1, or ought the indicators for profiles 3 and 4 been 2 and 3?] |
| General | |
| History |
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