Apple Aperture Late-Breaking News - Manual (Page 19)

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To stop building previews Library-wide and build previews on a project-by-project basis:
1 Choose Window > Show Task List.
2 Select the “Processing previews” task, then click the Cancel Task button.
3 Close the Background Task List window.
4 In the Projects panel, select Library and choose Maintain Previews For All Projects from
the Project Action pop-up menu (with a gear icon).
No checkmark or dash (–) next to the menu item indicates that preview maintenance is
disabled for the entire Library.
5 In the Projects panel, individually select the projects for which you want previews
created, then do one of the following:
 Control-click each project and choose Update Previews for Project from the
shortcut menu.
 Select each project and choose Maintain Previews for Project from the Project Action
pop-up menu (with a gear icon).
A checkmark next to the Maintain Previews for Project menu item indicates that
preview maintenance is enabled for the selected project.
Generating Previews for Projects You Intend to Keep Offline
A JPEG preview is displayed when a referenced image’s master file is offline or cannot
be found. This makes previews a great way of maintaining high picture quality while
conserving the disk space that master files (especially RAW files) require.
To use previews for offline referenced images:
1 Make sure the external hard drive containing the referenced master files you want to
keep offline is connected to your computer.
If the master files you want to keep offline are currently stored on your computer, you
must convert the images to referenced images and move the master files to an external
hard disk. You can do this by selecting the project containing the images whose master
files you want to keep offline, choosing File > Relocate Masters for Project, selecting an
external hard disk location for the master files, and then clicking Relocate Masters.
2 Control-click the project containing the images whose master files you want to keep
offline, then choose Update Previews from the shortcut menu.
3 When the previews are built (you can tell by choosing Window > Show Task List), you
can disconnect the hard disk containing the master files.
Even though the master files are offline, you can browse, search, and assign metadata
to preview images. You can even use the Loupe to zoom in on preview images,
because they are high-quality JPEG files.