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On 1/27/06 7:20 AM, Richard Green wrote:
> Can I ask those of you who are using/developing image-related
> repositories what metadata standard(s) you are using? Qualified DC,
> perhaps? MIX? Other? Combinations?
We have a bit of a mess at the moment -- a result of moving items from a
legacy system to Fedora and because we're building atop Elated and not
starting from scratch. In the first case we've got items in a
Bulldog/Documentum system where descriptive metadata sometimes had to be
put into "User Defined Fields" due to lack of flexibility in the legacy
system. Fortunately, with enough arm-twisting, the legacy system can
give us an XML file; it is our working plan to make this legacy XML file
a datastream in the Fedora object and write a disseminator to generate
the Dublin Core. There are aspects of system metadata from the legacy
system that we'll want to keep a handle on (and perhaps someday
crosswalk into PREMIS or equivalent).
The other factor, starting with Elated, means that we are constrained to
Dublin Core at the moment. We understand the need to refactor a great
deal of Elated's code to remove that constraint, but we haven't started
yet. (Has anyone else started in this area? If so, I'd love to chat.)
> And if you are storing an archive image in the repository (by which I
> mean a largely unmodified/uncompressed version of the original, possibly
> not for user access), what format are you using? RAW? Uncompressed
> TIFF? Other? (I realise there are flavours of RAW, flavours of TIFF,
> etc etc!)
We are storing the archival image in the Fedora repository as a
datastream in whatever format given to us. For our initial pass at
functionality we are also generating thumbnail and web presentation
derivatives at ingestion time and storing those as datastreams as well.
Eventually (within the next two to three months) we expect move to a
JPEG 2000 practice where we will store the image in whatever form it
came to us and at ingestion time create a JPEG 2000 master. From that
JPEG 2000 master we will deliver thumbnails and web presentation formats
through disseminators at request-time.
In addition to getting rid of the need of derivatives for access, the
JPEG 2000 conversion at ingestion time is our long-term hedge against
the active preservation problem for images. If at some point we don't
understand how to read the original graphic file format we can fall back
to the JPEG 2000 master in our graphic format content model.
At least, that's our plan at this point -- always subject to change
based on wisdom offered by the community.
Peter Murray http://www.pandc.org/peter/work/
Assistant Director, Multimedia Systems tel:+1-614-728-3600;ext=338
OhioLINK: the Ohio Library and Information Network Columbus, Ohio
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