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.
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:
Mar 18, 2020 Move your Photos library to save space on your Mac Prepare your drive. You can store your library on an external storage device. Move your Photos library to an external storage device. Delete original library to save space. After you open your library from its new location. How to transfer your iPhone or Mac Photo library to an external drive. By AppleInsider Staff Wednesday, January 31, 2018, 04:40 pm PT (07:40 pm ET) Storing an entire collection of photographs in. Jul 12, 2017 You can also just never convert your new photos library into a system library and just store all your photos locally (or on Dropbox or OneDrive or any other cloud drive). If you’re a Mac owner who’s used iPhoto or another third-party application, Apple’s new app and its iCloud integration will likely appeal to you because it is now OS X’s default, native photo application. Nov 09, 2018 There is a safer and easy way to transfer your entire photo library from your Mac to your external drive. The best of this trick is whenever you need to see your photos on your Mac you just need to open photo library app on your Mac it will automatically take you to your saved photos in external hard drive until unless it is plugged in. Aug 24, 2015 Open a new Finder window on your Mac. Click on Pictures in the left hand navigation. If it isn’t there, just search for your pictures folder using Spotlight. You should see two libraries, one is your old iPhoto Library and one is your new Photos library. Move your iPhoto Library to your trash can and empty it.
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)
How to export LDLIBRARYPATH to all users and system services. Ask Question Asked 7 years, 6 months ago. Active 3 years, 10 months ago. Viewed 37k times 12. I want to export LDLIBRARYPATH to system services and all users. System services are run before login. Can I set add something to PATH, system-wide for all users, which has LOWEST. I read some articles discouraging of the use of DYLDLIBRARYPATH, as the the path of dynamic library should be fixed using -installname, @rpath, and @loaderpath. In terms of making a program that runs both on Linux and Mac OS X, DYLDLIBRARYPATH of Mac OS. I have tried various combinations and I am stuck in trying to figure out the best method for having the LDLIBRARYPATH loaded. What I can't figure out is why compilervars.sh doesn't set LDLIBRARYPATH on the Phi. I have tried a number of the environment scripts as provided by the Intel tools, and none of them set LDLIBRARYPATH on the Phi. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Visit Stack Exchange. Mac set ld_library_path for root 1. Mar 03, 2017 I tried to import GPU Tensorflow; it failed to find the CUDA libraries. I checked the process.env environment variable and found that LDLIBRARYPATH and DYLDLIBRARYPATH had not been added. After further digging, I found that the shell-env package doesn't import them because it just calls the env command, which doesn't include them in its output for some reason.
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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.
Prepare your drive
You can store your library on an external storage device, such as a USB or Thunderbolt drive formatted as APFS or Mac OS Extended (Journaled).1 Find out how to check the format of your external storage device.
To prevent data loss, Apple doesn't recommend storing photo libraries on external storage devices like SD cards and USB flash drives, or drives that are shared on a network.
Move your Photos library to an external storage device
Quit Photos.
In the Finder, go to the external drive where you want to store your library.
In another Finder window, find your library. The default location is Users > [username] > Pictures, and it's named Photos Library.
Drag your library to its new location on the external drive. If you see an error, select your external drive's icon in the Finder, then choose File > Get Info. If the information under Sharing & Permissions isn't visible, click , then make sure the 'Ignore ownership on this volume' checkbox is selected. If it's not selected, click to unlock it, enter an administrator name and password, then select the checkbox.2
After the move is finished, double-click Photos Library in its new location to open it.
If you use iCloud Photo Library, designate this library as the System Photo Library.
Delete original library to save space
After you open your library from its new location and make sure that it works as expected, you can delete the library from its original location.
In a Finder window, go back to your Pictures folder (or whichever folder you copied your library from) and move Photos Library to the trash. Then choose Finder > Empty Trash to delete the library and reclaim disk space.
Open another Photos library
If you have multiple libraries, here's how to open a different one:
Quit Photos.
Press and hold the Option key while you open Photos.
Select the library that you want to open, then click Choose Library.
Photos uses this library until you open a different one.
Learn more
Backup Photo Library Mac
If you have a permissions issue with your library, you might be able to resolve the issue by using the Photos library repair tool.
1. You can't move your library to a disk that's used for Time Machine backups.
Mac Photo Library Management
Repair Mac Photos Library
2. If the volume isn't formatted APFS or Mac OS Extended (Journaled), or has been used for Time Machine backups but hasn't been erased, this checkbox will either not be present, or won't be selectable after unlocking. Erase and reformat the drive for this option to be available.