Photos in your System Photo Library are available in apps like iMovie, Pages, and Keynote. You can also sync them to iOS devices and view them on Apple TV. And if you want to use your own images as your desktop picture or screen saver, the images need to be in your System Photo Library before you can select them in System Preferences.

• Open Iphoto Library
• Photo And Iphoto On Mac

If you have only one photo library, then it's the System Photo Library. Otherwise, the first photo library that you create or open in Photos will become the System Photo Library. If you have more than one library, you might need to designate a System Photo Library, so other apps can access the photos and videos you want them to use.

Photos can still read and upgrade an iPhoto library, as it doesn’t require launching iPhoto. Photos doesn’t copy the iPhoto images, but it uses a special kind of link that lets the same file. Jul 12, 2017  Apple’s new Photos application was released as part of a recent system update. By default, Photos creates its library in your Pictures folder, but it can be easily moved or newly created. There are any number of reasons you might want to create a new Photos library. Nov 12, 2019  How to Back Up iCloud Photo Library to a Mac. Open the Photos app on your Mac by clicking its icon in the Dock. Click Photos in the menu bar and select Preferences from the drop-down menu. Choose the iCloud tab in the preferences screen. Check the box in front of iCloud Photos.

Follow these steps to designate a System Photo Library:

Open Iphoto Library

1. Quit Photos.
2. Hold down the Option key and open Photos. One of the photo libraries is already designated as YourLibraryName (System Photo Library).
3. Choose the library you want to designate as the System Photo Library.
4. After Photos opens the library, choose Photos > Preferences from the menu bar.
5. Click the General tab.
6. Click the Use as System Photo Library button.
   

Photo And Iphoto On Mac

If you open a second or different library in the Photos app, and you haven't designated it as the System Photo Library, other applications will use photos from the original System Photo Library. Hold down the Option key when you open Photos to see which library is set as the System Photo Library.

iCloud and the System Photo Library

You can use iCloud Photos, Shared Albums, and My Photo Stream only with the System Photo Library. If you choose a different library in Photos without designating it as the System Photo Library, the iCloud tab in Photos preferences is disabled:

If you designate a new library as the System Photo Library and then turn on iCloud Photos, the photos and videos in the new library will merge with those already in your iCloud Photos. If you want to keep the contents of your photo libraries separate, don’t turn on iCloud Photos for more than one library in Photos.