JPEG 2000

From: Louis H. Sharpe II (lsharpe@PICTUREL.COM)
Date: Sat Apr 08 2000 - 09:46:53 CDT

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    Message-Id: <200004081450.HAA21528@dns.ccit.arizona.edu>
Date:         Sat, 8 Apr 2000 08:46:53 -0600
From: "Louis H. Sharpe II" <mailto:lsharpe@PICTUREL.COM>
Subject:      JPEG 2000
To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU

    <pre> JPEG 2000 supports both lossy and lossless compression.

    The most cost-effective and rational choice for most "conventional" (i.e. microfilm replacement) preservation applications would be a "visually lossless" setting for JPEG 2000 where the loss is minimal and the cost benefit extraordinary. This loss will be considerably less that that found in the microfilm focus-expose-develop-print(-duplicate-print) processing chain which was accepted for the last 50+ years owing to its cost-effectiveness and reasonable quality. JPEG 2000, when used at most compression levels, completely avoids the blocking artifacts sometimes seen in JPEG.

    "National Treasure" class documents will of course be kept either uncompressed or might be candidates for JPEG 2000 lossless compression, despite the high cost disadvantage of lossless compression.

    Regardless of the level of loss in the copy in the archive (visually lossless or lossless), JPEG 2000 supports progressive quality, where the browsing client can cut it off at any quality point sufficient to its need, or, by waiting long enough receive a full-quality file.

    JPEG 2000 compressed data will live inside many file formats eventually. The optional .jp2 file format defined in an annex to Part I of the JPEG 2000 standard supports multiple XML metadata "boxes" which may be defined by groups with specific needs. The preservation community would constitute such a group. There are also boxes for private metadata and for intellectual property metadata.

    A sub-group of us on the JPEG 2000 committee is working to inform user communities about the benefits of JPEG 2000.

    Lou

    Louis H. Sharpe II mailto:lsharpe@picturel.com Picture Elements, Inc. +1 303-444-6767 410 22nd St., Boulder, CO 80302 USA fax +1 303-415-1392 http://www.picturel.com

    </pre>

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