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 |
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| 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 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 |
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| LC preference | See J2K_C |
| Disclosure | Public specification. Developed by the Library of Congress/National Endowment for the Humanities National Digital Newspaper Program (NDNP). |
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| Documentation | JPEG 2000 Profile for the National Digital Newspaper Program (2006). |
| Adoption | Required of participants in the NDNP. |
| Licensing and patents | 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 |
| Still Image | |
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| Normal rendering | See J2K_C |
| Clarity (high image resolution) | See J2K_C. |
| Color maintenance | Not applicable |
| 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 |
| Tag | Value | Note |
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| Filename extension | See note. | See JP2_FF |
| Internet Media Type | See note. | See JP2_FF |
| Magic numbers | See note. | See JP2_FF |
| Indicator for profile, level, version, etc. | Rsiz=2 |
From the specification: "This profile corresponds to Profile-1 of the JPEG2000 standard . . . Rsiz=2." |
| General | Chronicling America, as the National Digital Newspaper Project (NDNP) is known, is a twenty-year project that will digitize millions of newspaper pages, generally by scanning pre-existing microfilms. |
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| History | The development of the NDNP JPEG 2000 profile was led by Robert Buckley, for many years a researcher with Xerox, and active in the JPEG 2000 and other standards efforts. A preliminary version of the specification was posted online during 2005; the current version was posted in May 2006. |
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