sync KDE specific image metadata with EXIF, IPTC, ...?

[Kristian Rink]

Folks;

even though I learnt before that most KDE applications, including gwenview and 
(AFAICT) digikam, store their image metadate, such as keywords, "star" 
ratings, comments, ... in a database internal to KDE (which is generally good 
in terms of, say, integration with file managers and other KDE apps), yet not 
in image format specific metadata structures like EXIF (which is bad because 
these information gets lost whenever browsing these images using anything else 
than KDE).

Already filed an issue for gwenview talking about this, so that's not the 
point here. My question, however: Is there any doable way of syncing KDE 
specific image metadata with, say EXIF or IPTC in JPG images (or even just 
writing those information stored inside KDE back to the actual image file for 
the sake of export / archiving)? Best of course would be a way of doing so by 
using any existing app, kipi plugin or the like, but I wouldn't as well 
hesitate doing bash / python scripting or something like that to get there.

Ideas or inspirations on that, anyone?
TIA and all the best,
Kristian
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