On Fri 24-Sep-2010 at 03:04 -0700, kfj wrote:
Trying to extract the crop factor (or other lens- or camera-specific
information) from the EXIF data can be straightforward, but it may as
well be difficult or impossible, depending on the work flow.
I have had my issue with the lens data, where I couldn't get enough
EXIF information into the images to make hugin detect that I was using
a stereographic lens. My proposition was to use the information in the
EXIF tag 'LensModel' to pick a specific lens .ini file. Since
properties like the crop factor are gleaned from the lens .ini file,
this would solve the issue. It seems my proposal hasn't elicited any
interest whatsover, though :( - have a look at
http://groups.google.com/group/hugin-ptx/browse_thread/thread/cf6bba0d7babb4a5#
I intended to follow this up, but have been all over the place.
Yes, Hugin ought to be able to match EXIF data with saved lens
profiles, this was the reason why the .INI files actually contain
some data scraped from the EXIF - Though we never got around to
doing anything with it.
There is also lensfun, which is a lens database and library:
http://lensfun.berlios.de/
One of the reasons lensfun was started was so Hugin could use it
exactly as you described and we would lose the .INI files
altogether. Unfortunately nobody has had the time to do the Hugin
integration yet, but it is used by some RAW conversion software
already.
There is also a 'proof of concept' tool called lens-submit that can
extract calibration and EXIF data directly from .pto projects and
submit them to a central server:
http://search.cpan.org/dist/Panotools-Script/bin/lens-submit
http://comments.gmane.org/gmane.comp.misc.ptx/21536
--
Bruno
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