Problem with compression is the lossy-ness, i.e., data loss ...
same for lossy files types... which is why lossless file formats are
recommended...
Matt Morgan wrote:
Newman, Alan wrote:
Curious coincidence. I just distributed this link today to my staff
and I was preparing a post to MCN-L. We've adopted most of these
guidelines in my division at the National Gallery.
I'm curious to know which recommendations you haven't adopted ... let
us know!
I read through the UPDIG recommendations and found it really
interesting and helpful. I thought their recommendation for RAW format
was relatively unconvincing, though. Almost like they were saying "we
want to recommend RAW format, but we realize you're going to convert
them anyway, at least until the DNG format is widely-supported." Their
best arguments for RAW applied to oddball cameras--which to me is an
argument not to buy an oddball camera. Is anyone behaving differently,
and storing files in RAW (but not also storing in TIFF)? I think,
although I'm not sure, that the UPDIG Working Group has more faith in
RAW than the museum and library worlds do.
The other question I've been asking myself a lot lately, but haven't
seen addressed much, is why not store files with some form of
reversible compression like zip (or gzip or bzip2)? UPDIG doesn't
address this (although they allow that compression is valuable for
delivery). ZIP (and bzip2 and gzip) is perfectly reversible, and it's
tried and true. Why store 100Mb TIFF files when we could be storing
10Mb tiff.zip files? Has anyone out there opted to use reversible
compression in digital repositories? If not, why not?
I realize that JPEG2000 would also solve the compression problem, but
ZIP ought to have less of an acceptance problem than JPEG2000 (as it's
already so established).
Thanks,
Matt
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From the desk of James [Jim] E. Landrum III,
Archaeology Materials and Database Manager,
Archaeology Technologies Laboratory (ATL; http://atl.ndsu)
North Dakota State University (NDSU),
Digital Archive Network for Anthropology and World Heritage (DANA-WH;
http://dana-wh.net)
Computer Applications and Quantitative Methods in Archaeology (CAA)
CAA2006 Conference, Fargo, North Dakota, USA. http://www.caa2006.org
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