Another factor to consider here: starting with Shotwell 0.6 the user can
import RAW photos from cameras.  The exiv2 library can't write metadata
into most RAW formats (run "man exiv2" to see a list of formats and the
metadata which can be read/written into them).  Writing metadata into a
RAW file is considered slightly risky even when using programs such as
Aperture; see http://aperture.maccreate.com/2010/02/10/write-iptc-
metadata-to-masters/ for a discussion, for example.

So if a photo is RAW, we can't realistically keep up-to-date metadata in
the photo file; we can only store it in the Shotwell database and/or a
parallel JPEG file generated from the RAW photo.

Perhaps someday camera manufacturers will converge on a single RAW
format where software can easily update metadata; DNG is the best hope
for that.  That day is probably far off, though.

-- 
Store/read tags inside photos
https://bugs.launchpad.net/bugs/579804
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