On 22 May 2007, at 23:30, Wilhelm Sanke wrote:
These are indeed valid arguments that have to be considered .
As far as I know, however, the situation may be at least different
for Windows and MacOS. I do not know if the OSX finder could access
EXIF data automatically, but WindowsXP surely does.
The EXIF creation date of a camera image is automatically read by
WindowsXP, as can be seen in the file information when you
configure the folder setting accordingly. So there would be no
slowdown of any kind when incorporating this information in the
detailed files.
I am not really sure what the OSX finder does. If in fact it should
be able to access such data, then I would repeat my recommendation
for the detailed files.
'Get Info' in the Finder (at least on 10.4.9) shows the manufacturer,
model, colour space, profile, focal length and shutter speed for
images with EXIF info. Spotlight allows you to search by lots of
other EXIF tags, although I've not seen an EXIF creation date in the
list.
However, you can *never* assume that EXIF data is present in an image
file - many photographers use special EXIF-stripping utilities before
uploading files to webservers if for some reason they don't want the
client to know things like the time the shot was taken.
Obviously this isn't a problem for images that have been 'saved as'
with the EXIF data stripped out because they will have a new valid
creation date being new files, but people do it to original files as
well (or copies if they know what's good for them...).
If not, then - as the main purpose of this discussion was about
including valid creation date information in Metacard/Revolution
applications - we should tweak Alex Tweedly's "libEXIF" stack to
produce a handy function to include a reliable creation date
information in our stacks if needed.
It's not as trivial as it may sound.
I work with a lot of programs that deal with EXIF data, and many of
them store it differently, especially when it comes to images that
started off as RAW files. Plus you'd have to try and decode the two
gazzillion different RAW formats that are the result of a different
file format for *every* camera model of *every* manufacturer...
I'm probably coming across as really negative, but EXIF data is
nowhere near as straightforward a topic as it first appears. :-(
Ian
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