



All edited images will be paired with their originals, so you can undo the edits and revert to the original. Your albums and folders will migrate, keywords, titles, and other metadata. Merge the libraries in iCloud by uploading them to the same iCloud Photo Library: Merging in iCloud is the only way to preserve the master-version pairs, so you can revert edited photos to the original versions.Make backup copies of the libraries before you try that.
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If you are planning to migrate your photo libraries from Aperture or iPhoto to Photos and own Aperture 3.6, merge your libraries in Aperture before the migration while you still can use Aperture as described here:Īperture 3.3: How to use Aperture to merge iPhoto libraries (wayback machine) Photos 2.0 or older will not sync the faces with iCloud. There is no lossless merging of Photos Libraries other than iCloud Photo Library, and even the merging in iCloud will not include the print products. There is currently no completely lossless way to merge Photos Libraries, because Photos does not support importing one Photos Library into another library. (this applies to Photos 5.0 on Catalina as well) Written for Photos 4.0 on macOS 10.14.4 or older: The products (books, cards, calendars, slideshows) should be migrated.All metadata, including the faces labels should be migrated.The library structure with albums, smart albums should be preserved in the merged library.The original photos and the edited versions should be merged into the merged library as master-version pairs, so it will be possible to revert edited photos to the original.When merging two photo libraries we usually want a lossless merge:
