I have several thousand pictures that I described and tagged in Microsoft Photo Gallery in recent years. Because they no longer develop it, and because there seem to be better alternatives to it, I would like to move the pictures somewhere else, but preserve the effects of my hard work.
Seems that XMP metadata is not strictly standardized, and for instance Microsoft, Google and Apple have different approach to storing tagged faces there (I mean names and areas assigned to them). According to what I noticed, Google Picasa is able to read people tags correctly from pictures tagged by Photo Gallery, but not the other way round. Apple Photos, on the other hand, does recognize neither those from Photo Gallery nor those from Picasa.
I don't know much about the XMP format, but when exported by Exiv2, it is an XML document. Apparently, it seems easy to export XMP metadata from a picture file, so I think it would be as easy to create an XML document with data from the source one in an appropriate format, and then write it back to the same picture. The thing is, however, that I didn't manage to find any software that can do that automatically.
I would like to migrate pictures I tagged and described in Microsoft Photo Gallery to Apple Photos. Do you know any tools that could help me do that without losing any portion of the data I wrote into those images (location, description, faces, descriptive tags)?