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JPEG2000 Profile

Page history last edited by Monica 12 years, 2 months ago

Recommended usage for JPEG 2000 (JP2) format is as an access version for image based files. The JPEG2000 format provides enhance online viewing of graphically dense images by allowing a user to zoom and view greater detail than a low resolution format. This format requires special software to create and view online. The IR has been configured to present these images through common web browsers and allows JP2 files to be downloaded directly or a snap shot of an online view may also be downloaded as simple jpeg.

 

Guidelines for creating JPEG2000 files

 

Significant characteristics

 

Parameters

Used for

Image type: Maps, illustrations, photographs

Conversion software used

Kakadu

Online display software

djatoka

File format

Part 1 (.jp2)

Lossy or lossless

Lossy

Typical compression

 

Tiling

1024x1024

Progression order

RPCL

Number of decomp. Levels

 

Number of quality layers

 

Code black size (xcb=ycb)

6

Transformation

 

Precinct size

256x256 for first two decomp. levels,

128x128 for lower levels

Regions of Interest

No

Code blck size

64x64

TLM markers

Yes “R”

Bypass

Yes

 

Command line code: ./kdu_compress -i example.jp2 "Cblk={64,64}" Corder=RPCL "Stiles={1024,1024}" "Cprecincts={256,256},{128,128}" ORGtparts=R -rate 1 Clayers=12 Clevels=5 "Cmodes={BYPASS}"

 

History

  • Initially reviewed JPEG2000 as an "archival format" or replacement for TIFF files. Determine this use was not an acceptable preservation format. Reasons (briefly stated) include:

    • Lack of color profile support

    • Specifications still under review (format not well-established, standard development ongoing)

    • Reduce storage costs (though a major consideration in other institutions), is not a major issue for our archive (at this time) as we do not produce significant tiff files on a massive scale to benefit on storage savings

    • Lack of capture mechanism (JPEG2000 must be converted from TIFFs)

  • Research use of JPEG2000 as an access version only for enhanced online experience

  • Investigated and tested format versions (JP2 vs JPK), multiple conversion software and various specification parameters

  • Design batch processing workflow to provide consistency in creation of files and efficiency of file creations

 

 

Selected Bibliography

https://www.zotero.org/groups/jpeg2000_bibliography

 

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