evaluating jpeg2000 for cultural heritage organizations gretchen gueguen digital archivist 9/13/2011...
TRANSCRIPT
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Evaluating JPEG2000 for Evaluating JPEG2000 for Cultural Heritage Cultural Heritage OrganizationsOrganizations
Gretchen GueguenDigital Archivist
9/13/2011
Evaluating JPEG2000 for Cultural Heritage Organizations by Gretchen Gueguen is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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What We’ll Cover…
• What is JPEG2000• What are the advantages?• What are the risks?• How do I decide if JPEG2000 is the
standard for me?
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JPEG2000
Dry, dictionary definition:
JPEG 2000 is an image compression standard and coding system. It was created by the Joint Photographic Experts Group committee in 2000 with the intention of superseding their original discrete cosine transform-based JPEG standard (created in 1992) with a newly designed, wavelet-based method.
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JPEG2000
• Format for still and moving images• Smaller than some other high resolution
formats • Ability to compress through lossless or
visually lossless algorithms• Scalable display• More robust embedded metadata• Error resilience• Supports images at least up to a terabyte
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Risks
• Uptake in adoption, but not as fully compatible as TIFF or JPEG– Digitization– Display/handling
• Unfamiliarity to administrators and users
• Complexity can lead to long-term riskshttp://www.dlib.org/dlib/may11/vanderknijff/05vanderknijff.html
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Decision-making
Evaluation Factors:•Compression and savings possible•Scalability vs. Derivatives•Tools Available•Conversion projects•Adoption by peers
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JPEG2000 compression
• True Lossless (reversible)– Can still achieve significant size
reduction
• “Visually” Lossless (irreversible)– Lossy compression with no visible effect
• Lossy (irreversible)– Lossy compression with visible effects
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Compressions and savings
TIFF = 35 Mb 1:1/2:1 = 4.96 Mb (86% reduction)
4:1 = 4.56 Mb (87% reduction) 6:1 = 3.89 Mb (89% reduction) 10:1 = 2.87 Mb (92% reduction) 25:1 = 1.39 Mb (96% reduction) 50:1 = 0.72 Mb (98% reduction) 100:1 = 0.37 Mb (99% reduction)
Source: http://jpeg2000wellcomelibrary.blogspot.com/2010/08/as-result-of-our-decision-to-go-lossy.html
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Compression rate
• Testing compression algorithms to get best trade-off– Even lossless can save a lot– At what point are your returns for
further compression too small
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Evaluating compression
Comparing Differences using Photoshop•http://jpeg2000wellcomelibrary.blogspot.com/2010/10/guest-post-examining-losses-simple.html
•http://www.digitizationguidelines.gov/still-image/documents/Comstock.pdf
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Lossy Compression and Predictability
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JPEG2000 Scalability
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Scalability vs. Derivatives
• JPEG2000 can natively scale to different sizes
• Do you WANT to only have one copy?– Preservation master– Production master– Access copies
(full, high, and/or medium resolutions)
– Thumbnails
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JPEG2000 Tools: Image Creation
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JPEG2000 Tools: Display
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JPEG2000 Tools
• Serve and Render–Kakadu + Djatoka (open source*)
http://www.kakadusoftware.comhttp://sourceforge.net/apps/mediawiki/djatoka/
–LuraWave (commercial)https://www.luratech.com/products/imaging-solutions/lurawave-jp2-image-content-server.html
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JPEG2000 Tools
• Online enhancement– Internet Archive BookReader (open
source)http://openlibrary.org/dev/docs/bookreader
–Library of Congress Newspaper Viewer (open-source)http://sourceforge.net/projects/loc-ndnp/
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JPEG2000 Tools
• Create or edit–Photoshop (commercial)• j2k plugin for more advanced workhttp://www.fnordware.com/j2k/
–Newer versions of Silverfast (commercial)–GIMP (open source)• lower level support
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Backlog Conversions
• TIFF to JPEG2K backlog?– Infrastructure – Time• Testing• Migration• QA
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Adoption by Peers
• Library of Congress• Internet Archive• Wellcome Library• Google• LexisNexis• Multiple Universities…
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ECU Example
• JP2 master going forward. No backlog conversion (at this time)
• Scan as tiff due to software constraints, convert to JP2 during post-production clean-up phase
• Save the master in offline storage• Deliver a derivative JP2 for access for
maps and books in a zooming book viewer• Use a GIF thumb because of load issues
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UVa Example
• Uncompressed tiff as preservation master• 186,000+ jp2 for access purposes only– Maps, books, and sheet music– Other things just in tiff at the moment, not
available yet• Two different lossy compression algorithms for
access based on average compression toleration– One for large-scale maps– One for everything else
• Dynamically-generated thumbnails
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Learn More…
JP2K-UK Working Group Wiki•http://wiki.opf-labs.org/display/JP2/Home
JP2k at Wellcome Library Blog•http://jpeg2000wellcomelibrary.blogspot.com/
JPEG 2000 for the Practitioner•http://www.dpconline.org/events/details/19-jpeg-2000-for-the-practioner?xref=19
Library of Congress JPEG2000 Workshop presentations•http://www.digitizationguidelines.gov/resources/jpeg2000.html
UConn survey on JPEG2000 adoption rate•http://digitalcommons.uconn.edu/libr_pubs/19/
DPBestFlow.org•http://www.dpbestflow.org/