I recently changed my gallery to Piwigo after a number of years running Zenphoto. I think it's clear which I prefer already :-)
I spent a reasonable amount of time migrating some of the data, such as the photo's title and description as well as all the tags, which I documented and put up onto my website. I hope it's OK to post it here and I hope it helps someone.
Thanks to the Piwigo team for the software.
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Hello welcome and thanks a lot for your great contribution!!
It might be start for a plugin. Again thanks I hope It will bring to you a substantial traffic ;-)
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Thanks flop25. Not sure about a plugin, the target audience would be quite small and I could see such a thing being more trouble that it's worth, especially as the new versions of both galleries come along. Hopefully it'll give people enough information to get going though. Of course, it misses parts such as any votes or comments, but I was happy enough to not bother with those. I'm not really bothered about substantial traffic either :)
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Professionally I'm a database guy, and I love working at the level that you described for migrating your site. I use PHPAdmin on an all too regular basis to go straight in to my comments table to edit out link spam URLs: keep the comment, lose the link. ;-)
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