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 | JPEG 2000 NDNP Profile |
| Description | Implementation of JPEG 2000 Core Coding (Part 1) that constrains the use of variables in the specification and has been designed to support the National Digital Newspaper Program (NDNP). A number of elements are required by the specification, including but not limited to: • Grayscale imagery: file to contain only one 8-bit component, color specification to be the grayscale enumerated color space or the Monochrome Input restricted ICC profile • Lossy compression: wavelet transform to use the 9-7 irreversible filter • RLCP progression order (Resolution level-Layer-Component-Position), thus providing a progression "by quality" to make it easy to extract low resolution thumbnails or a navigation pane. • Image tiles at 1024x1024 • Specified metadata to be provided in the JPEG 2000 XML box The specification may be modified based on the actual experiences of the NDNP. Additional general information about JPEG 2000 profiles is provided in J2K_C Notes. |
| Production phase | Used for content in middle and final states. |
| Relationship to other formats | |
| Subtype of | J2K_C, JPEG 2000 Part 1, Core Coding System |
| Used by | JP2_J2K_C_NDNP, JP2 File with JPEG 2000 Core Coding, NDNP Profile |
| LC experience or existing holdings | See J2K_C |
| LC preference | See J2K_C |
| Disclosure | Public specification. Developed by the Library of Congress/National Endowment for the Humanities National Digital Newspaper Program (NDNP). |
| Documentation | NDNP JPEG 2000 Profile. |
| Adoption | Required of participants in the NDNP. |
| Licensing and patent claims | None |
| Transparency | See J2K_C |
| Self-documentation | Metadata is required by this profile; see also 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. |
| Color maintenance | Not applicable |
| 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 | See JP2_FF | |
| Internet Media Type | See JP2_FF | |
| Magic numbers | See JP2_FF |
| General | The NDNP is conceived as a twenty year project that will digitize millions of newspaper pages, generally by scanning pre-existing microfilms. The program got under way in 2004; public access to an initial offering is anticipated in late 2006 or early 2007. |
| History | The development of the JPEG 2000 profile was led by Robert Buckley of Xerox Global Services. A preliminary version of the specification was posted online during 2005; a more complete version was delivered in January 2005 and the current version was posted in May 2006. |
URLs
• Specification (http://www.loc.gov/ndnp/pdf/NDNP_JP2HistNewsProfile.pdf)
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