This user tip has been moved to: Notes on Merging Photos Libraries, 2019 Version
Mar 03, 2019 The download will be like to a different Mac, see: Use Photos and iCloud Photo Library on multiple Mac computers - Apple SupportTo sync the faces names with iCloud Photo Library, I apply keywords with the names of the persons to all photos in a people album. But it’s also a ground-up rewrite of our Mac photo experience, and some pieces are missing (some permanently), some moved, and some broken. And keeping them outside of the Photos library. 'PowerPhotos is an extremely useful addition as an enhancement for any Photos user trying to perform tasks that fall outside of Photos restricted purview.' – Macworld 'PowerPhotos may lack the punch of its predecessor, iPhoto Library Manager, but it’s indispensable for those making the transition to Photos.' May 07, 2015 A window will pop up with a number, which in my Mac’s case was over 236GB between a number of different photo libraries — Apple’s Photo Booth, Aperture, iPhoto, and Photos, just to name a few.
The older version can no longer be edited without destroying the formatting.
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When merging two photo libraries we usually want a lossless merge: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.The library structure with albums, smart albums should be preserved in the merged library.All metadata, including the faces labels should be migrated.The products (books, cards, calendars, slideshows) should be migrated.
Written for Photos 2.0 on macOS 10.12.4 or older:There is currently no completely lossless way to merge Photos Libraries, because Photos does not support importing one Photos Library into another library. All work-around methods are compromises. There is no lossless merging of Photos Libraries other than iCloud Photo Library, and even the merging in iCloud will not include the faces albums and the print products.
Mac os x developer library dvd. 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: Aperture 3.3: How to use Aperture to merge iPhoto libraries - Apple SupportMake backup copies of the libraries before you try that.
You will have to recreate the albums as well.Merge the libraries with PowerPhotos: PowerPhotos is a tool to manage Photos Libraries. You can easily browse libraries in turn and move photos between libraries. Merging with PowerPhotos is fast (https://www.fatcatsoftware.com/powerphotos/. It will migrate the metadata and the albums, but you have to decide, if you want to use the originals or the edited versions. Mac photos library export list. So you will either lose the editing work or the high quality originals or create redundancy by merging twice in two passes, once to transfer the originals, and then the edited versions. You will have to add a pass to remove duplicates afterward. See chapter six in the PowerPhotos manual: : https://www.fatcatsoftware.com/powerphotos/Help/merging%20libraries.htmlAnother option would by to keep both libraries separate and use PowerPhotos to browse the libraries and to transfer selected albums as you go.iCloud Photo Library would be the best option. Merging with PowerPhotos the second best.Update for Photos 3.0 on macOS 10.13:Photos 3.0 will also sync the recognized faces when you merge two Photos 3.0 libraries in iCloud. projects do still not sync to iCloud.