[Shotwell] Regenerate thumbnails?

[oliver]

On Fri, Aug 26, 2011 at 09:16:23PM +0200, pt wrote:
> On 26 August 2011 18:55, Andy Stevens <insomniacpenguin at googlemail.com> wrote:
> >
> > Also, is there any way to edit the pictures' extended metadata, not just
> > the basic title/tags/rotation/timestamp?
> 
> As far as I know, Shotwell just does the 'title' tag (and F-spot just
> the 'description').
> 
> Usually I use geeqie (sudo apt-get install geeqie) for all the
> tagging, because it supports reading and writing of many more tags
> (AFAIK most of the XMP stuff, including copyright, location and so
> on).
> 
> As per your other e-mail (at least I think it was you) on mass
> changing/deleting tags on over-tagged photos, I recommend exiftool. It
> is a command-line tool, but it can do wonders, like changing tags
> recursively on directories, and it also supports 'if-then' statements.
> There is a GUI for Windows, but so far nobody tried to make a GUI for
> real operating systems, unfortunately.
[...]

Hmhhh... does shotwell make the tags part of the image (EXIF-headers / jpg-comments)?
I thought the tags are hold in the database...
So I wonder why you would use exiftool to add tags to be used in shotwell...

Ciao,
   Oliver