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Summary:
FCLA's XPAT Image Class middleware (v.11) supports compressed
images in the JP2 format for PALMM Visual
Collections. JPEG 2000 is a new standard for
still image compression from the JPEG
committee. No single method of processing is
recommended, but Kakadu,
ImageMagick,
or Adobe® Photoshop® CS (Photoshop
8.0) software currently allow JP2 processing.
Specifications:
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File Format: |
JPEG
2000 (Joint Photographic Expert Group)
Specification: ISO/IEC 15444-1
Reference: http://www.jpeg.org/jpeg2000/
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Compression: |
Minimum
(highest image quality),
Range from 10% to 15% (image quality
not less than 85% of source file) |
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Bit-depth: |
Same
as source file |
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DPI: |
Same
as source file
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| Image
Dimensions: |
Same as
source file |
| File Header: |
Append structured information
about the derivation process as appropriate to the SUSDL
XML Metadata DTD (forthcoming)
A
structured information template will be added in a future
revision of these Guidelines |
Process:
No single method of processing is recommended. However,
the following Instructions
provide one example using Adobe® Photoshop® CS (Photoshop
8.0).
Quality control:
A visual inspection together with a query of the file header
should be completed by spot check. Spot check requires
inspection of every image in thumbnail view and of no less
than 10% of the images in full-image view. A variety of factors
effecting on-screen and print legibility should be examined.
For additional guidance, we recommend reading Cornell
University's Digital
Imaging Tutorial: Quality Control.
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