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The technique for doing this is not very intuitive and not
well documented, but basically what you want to do is use
the same technique as you would if you wanted to replace
only a specific value:
exiftool -artist-=you -artist=me image.jpg
but in your case you want to replace the tag only if the
previous value was empty:
exiftool -artist-= -artist=me image.jpg
I think this should do what you want.
- Phil
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