We have two Photo libraries (one for my wife and one for me, different user accounts on one Mac, El Capitan). Now I would like to move most photos and videos from her Photos library into my Photos library.
How can I do this easily?
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Really, you can't.
Short answer, if you like to edit, rate, or adjust your photos. You have no way to migrate photos in libraries non-destructively without paying Apple for iCloud.
It can be done with PowerPhoto's merging capability. It's not free though.
Still no simple built in answer, but an additional app is PhotosTakeout.
Using this tool, you can conveniently export the photos from the original Library. Then you would import them into the other Library. Then delete from the source Lib.
In truth, PowerPhotos will have to do the same operation. It cannot move them in one step, but can only copy them, leaving you to manually clean up by deleting the copied pix from the original Library. But that is one less step than with PhotosTakeout.
There is a way to merge libraries: iCloud photo library.
/Users/Sharedis a good place to do this).