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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.

1. Mac Os Show User Library Folder
2. Mac Os User Library Folder Hidden

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.

Follow these steps to designate a System Photo 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.
   

May 30, 2019 Despite the fact that Apple keeps the Mac Library folder hidden from users, it’s good to learn how to show the Library folder on Mac. You may need to access the Library folder when you need to clear cache, remove the app’s leftovers, edit preference files manually, etc. Some troubleshooting procedures require you to navigate to and view a hidden folder on Mac. You can access the Library folder with the Go To Folder command or from the Terminal app. Access the Library folder in Finder: In Finder, choose Go Go To Folder In the Go To The Folder field, enter /library/ Click Go. Access the Library folder directly through the Terminal: Click the Spotlight Search.

• The new Find My app combines Find My iPhone and Find My Friends into a single, easy-to-use app that’s now available on the Mac. Use it to locate your friends and family, share your location, and find missing devices—even if they’re offline.
• Mar 18, 2020 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.
• Apr 01, 2020 Designate a System Photo Library in Photos If you have multiple photo libraries on your Mac, you can choose one to be the System Photo Library. The System Photo Library is the only library that can be used with iCloud Photos, Shared Albums, and My Photo Stream.

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.

Home > Articles > Apple > Operating Systems

1. The Layers of Mac OS X: Aqua

There is more than one way to think about dividing up a pizza. First, there is the familiar method of dividing it into slices. Alternatively, you could divide it into layers: topping, cheese, sauce, crust. Theoretically, you could also divide it into its basic ingredients: flour, water, tomatoes, garlic, milk. Each method makes a different contribution to your enjoyment of the pizza. The first method (slices) is best when you're getting ready to eat the pizza; the second is best when you are deciding what to order (such as pepperoni with extra cheese); the third is best if you are concerned about nutrition (needing to know the exact ingredients to calculate calories).

The same is true for Mac OS X. There are multiple ways to look at it and take it apart. Each way makes its own contribution to your understanding of the OS. In this chapter, I look at the major ways to 'take apart' Mac OS X. Having at least a minimal knowledge of Mac OS 9 will help, as I occasionally make comparisons between the two OS versions. But even if you've never used Mac OS 9, you'll be able to follow along.

In This Chapter

The Layers of Mac OS X: Aqua

The Layers of Mac OS X: Application Environments

Cocoa
Carbon
Classic
Java
Putting it together

The Layers of Mac OS X: Graphics Services

Quartz
Multimedia: OpenGL and QuickTime

Mac Os Show User Library Folder

The Layers of Mac OS X: Darwin

Mach
BSD (Unix)

Domains: An Overview

System domain
Local domain
User domain
Network domain

The Libraries of Mac OS X: /System/Library

Core Services
CFMSupport
Extensions
Fonts
Frameworks
PreferencePanes
Printers
QuickTime
ScreenSavers
Services
Sounds
StartupItems

The Libraries of Mac OS X: /Library

Application Support
ColorSync
Contextual Menu Items
Desktop Pictures
Documentation
Fonts
Internet Plug-Ins
Modem Scripts
Preferences
Printers
Receipts
StartupItems

The Libraries of Mac OS X: Users/'Home'/Library

Application Support
Caches
Favorites
Font Collections
Fonts
Internet Search Sites
Keychains
Preference Panes
Preferences
Application-specific folders

Fonts in Mac OS X: Font Formats

TrueType fonts
PostScript fonts
OpenType fonts
Bitmap fonts
Identifying font formats

Fonts in Mac OS X: Working with Fonts Mac copy image.

Font Panel window
Font smoothing and Mac OS X
International language support: basics
International language support: troubleshooting
Font utilities

The Layers of Mac OS X: Aqua

Aqua is the name given to what most users think of when they think of Mac OS X: the user interface, the Finder, the Dock, the windows, the translucent buttons, the high-resolution icons, the menus, and all the rest. Many users may never explore Mac OS X beyond its Aqua layer.

From this perspective, a user upgrading from Mac OS 9 will feel quite at home, at least initially. Much still works the same way. You still double-click icons in the Finder to launch them; you still choose the Save command from an application's File menu to save a document; you still open a folder icon to see its contents.

But you will soon notice some significant differences: a new column view, a very different Apple menu, the Dock. I discussed the basics in Chapter 3, when I presented an overview of Mac OS X.

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