The Power of Merging Libraries
Aperture 3 has added a whole host of functions for the control of Libraries. It’s possible to export anything as a Library and to import or merge libraries. Merging is one of the more powerful features as it allows Libraries with similar contents to be combined, preserving changes.
Let’s say for example that a photographer has a Library on their work desktop and their travel laptop, and both of them contain the same content when the photographer goes on the road. While on location the photographer imports into the Library as normal. With Aperture 2, when returning back to the office it would be necessary to export each Project from the location shoot and then import each of those into the desktop Aperture Library. This would take a lot of time and disk space as the images exported from the original Project would live in the laptop Library and wherever they were exported to, before they were imported into the desktop Library. In essence there would be three copies of each file.
The alternate approach would be to overwrite the desktop Library with the laptop on, but that has its own issues.
By being able to merge Libraries, it’s now possible in this same situation for the photographer to shoot in the field on their laptop and simply tell Aperture to merge the two Libraries, which will have the effect of only importing files that have change. (These files can be the new images, or any shots from the original Library that were edited on the laptop.)
Here’s how to do that.
Start with a Library

Here’s our working Library, the one that’s on the desktop. Now we’ll want to import the Library from the laptop.
Import

From the File menu select Library/Project
Navigate to Library

Navigate to your Library on your laptop.
Note: The names of the Libraries do NOT have to match. In fact, the contents don’t have to match at all. This same process works for adding a new Library instead of merging one, essentially sucking one whole Library into another. Just click Add below instead of Merge.
Merge Libraries

Click the button to Merge your Libraries.
Conflict Management

Select what you’d like to happen if there is a conflict in the Library. (A conflict would arise if you had a file on the original Library that you edited on the laptop in this case.) You can either have the original Library or the new Library take precedent.)
Merged

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4 Comments
Keith Heneghan (2 comments.)
February 16th, 2010
Hi David,
I’ve followed your instructions, however, I get this message when I try to import my library:
“Error importing library
The library could not be imported because it is a duplicate of the library currently running.”
Any idea what I’m doing wrong?
I’m using the Aperture 3 Trial
Keith Heneghan (2 comments.)
February 16th, 2010
Hi David,
I figured out what my problem was.
I had copied my library from one computer to the other so basically it was the same library instead of two different ones.
It appears you cannot then merge the two.
Thought I’d post an update incase anyone else ever has a similar problem.
Thanks for all the tips.
Ken
February 18th, 2010
Wait…
So merging doesn’t really merge?
From the looks of it if laptop edits photo A, and Desktop edits photo B then you can only have one of those edits? If that’s the case then that’s pretty lame.
How hard would it be to go – oh, we now have one master with two versions?
If that dialog is for metadata then I can understand.
Ken
February 18th, 2010
Posting without sleep – I meant if Laptop and Desktop both edited photo A