- 2020-3-18 Your Photos library holds all your photos, albums, slideshows, and print projects. If your library is large, and you want to free up storage space on your Mac, turn on iCloud Photo Library and use Optimize Mac Storage, or move your library to an external drive. Before you start, be sure to back up your library.
- IMyFone Options to Delete Photo Library. Backup & Delete: You can choose to transfer photo library to computer for backup and delete them from iPhone. Permanently Delete You can preview and permanently delete photo library from iPhone/iPad, 100% unrecoverable.; You can also find out the previously deleted photos which are still under the risk of recvoery and completely make them gone.
- Delete the Library (or Libraries) Launch Photos; Drag the Masters folder into Photos to import the photos back in; And whatever you do, don't go deleting any old iPhoto library on your system. As a part of the migration from iPhoto to Photos app, the developers chose to simply link to the photos already in the old library while adding photos to.
Turns out that Photos does pretty sophisticated library management; enough so that you're not duplicating space if you're migrating from iPhoto or Aperture. If you've migrated an existing iPhoto or Aperture photo library to Photos, Photos creates a brand new library structure but doesn't, in point of fact, duplicate your images. Instead it creates links to the original and preview versions of your images.
Dec 20, 2017 You’ll have to do it manually and here’s how to do it: Open Photos preference pane. Click on the iCloud tab. Turn OFF iCloud Photo Library (this will break the sync with iCloud) Either manually delete the photos you don’t want anymore (this deletion will not sync with iCloud) Or delete the entire Photos library. Mar 17, 2019 Launch the Photos app on your Mac. Select the picture(s) or video(s) you want to delete Right-click on an image or shift-click on a bunch and then right-click and click Delete. (You can also click on an image and press delete on your keyboard, or command + delete to skip the confirmation dialog.).
When you're looking at your Photos library in the Finder, it includes all of your original images and previews. But the images exist only in one location on your hard drive, even if you have multiple photo libraries.

Here's what Apple has to say for people anxious to pull the delete trigger:
Iphoto Windows 10
After you migrate your iPhoto or Aperture library to Photos, you might feel tempted to delete your original iPhoto or Aperture library. Because the migrated library takes little additional space, you don't need to delete the original library.
So don't do it, even if you're tempted to.
You can still use your original photo library with iPhoto (version 9.6.1, as of this writing) and Aperture (version 3.6) after you've migrated it to Photos. Just bear in mind that any changes you make in iPhoto or Aperture will be resident only in those applications, not Photos. So if you make new image edits in Aperture or create a new iPhoto album, those will only appear in their respective apps, not Photos.
(Hat tip: Dave Sanderson)
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