It is creating a new merged library
I was merging a small library into an existing library, not a new library.
and is leaving the source libraries untouched.
My goal in doing this merger was to simplify things and reduce the number of libraries I had. I want the images and metadata from the source library to go into the existing library, (I believe I accomplish this but I am confused because the old library is still there).
Keep a copy of the originals libraries on external drive, so you can go back to the library, when you discover that items did not migrate correctly.
I have Time Machine and other backups.
because merging with PowerPhotos is lossy.
I am unable to detect any loss. The images that were moved appear to be of the same size and quality that they had in the source library. None of these images have ever been edited in any way.
You can only move the edited versions or the originals to the other library, but not both of them as a pair.
The directions to PowerPhotos says that if there was no an edited version, the original image will be moved. I must assume that is what happened in my case.
Once you copied the library to an external drive, you can delete the library you merged into the other library.
Now we are getting into the meat of the subject. How do I delete a library? The library that I want to delete still has the images that I moved in it. ( Maybe they were COPIED to the destination library? )
Ctrl-click or right-click the photo and select "Show original file in Finder". Is the revealed photo inside the merged Photos Library or in a folder outside the library?
It looks to me like the original source image is in the Photos destination folder.
/Users/homefolder/Pictures/ Photos Librarys/abc.photoslibrary/Masters/2018/04/08/20180408-032144
I think the merger worked. Perhaps my question is boiling down to the consequences of deleting the old source library.
