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NISO Z39.87 is currently undergoing
revisions, and will be balloted on September 31st 2004. The standard currently proposes 111
data fields, of which 33 are mandatory or mandatory if applicable. Once all
the theoretical work of determining the elements necessary for preservation has
been done, the practical questions of how to capture these fields in an
economic manner loom large.
Note that in increasing number of
elements, the number of mandatory elements has increased as well. But it is important to make the distinction
that some of the new elements are related to existing ones and add
to flexibility of metadata recording (for example, creating a home to embed a
color profile) rather than simply increasing the burden of metadata
collection.
The RLG initiative Automatic Exposure
addresses the issue of implementing the NISO Z39.87 standard. What I’ll share
with you today are some of the outcomes of the research that went into the
whitepaper.
The specifications listed on this slide
represent the current options a digital camera has of saving the technical
metadata at the time of capture. The question for us is: can these
specifications be leveraged to satisfy NISO Z39.87?
Overall, you can see that TIFF, DIG35 and
EXIF cover about 40-45% of NISO Z39.87. In a more detailed analysis, it turns
out that each of the specifications has an achiles heel – meaning a section in
which it really underperforms.
TIFF – Image Creation and Change History
DIG35 – Basic Image Parameters and Imaging Performance Assessment
EXIF – Change History
45-60% Just looking at the elements
currently Mandatory or Mandatory if Applicable in NISO Z39.87 presents us with
the following picture:
TIFF nice spread of elements across the categories
DIG35 especially weak in Imaging Performance Assessment
EXIF nice spread, covers 50% or more
These tools are doing the hard work of
examining files, determining where metadata is lurking, and dragging it out
into the open. While some work across a number of file formats, all of them
work on TIFF files. These tools give you access to metadata that’s already
there, meaning they leverage existing specifications. All of them have expressed
an interest in sharing their tool.
During our meeting in Las Vegas,
representatives from the Cultural Heritage community encouraged us to push for
the entire NISO Z39.87 element set.
IT10 has created a JPEG2000 profile which
they declare to be JPEG2000 “suitable for Digital Still Camera use.”
Encouraged
us to consider working with JPEG2000 standardization to create profile we
might want.