3.3

Chapter 5 Displaying Photos in the Viewer 116
The Previews pane appears.
For more information about the Previews pane, see Previews Preferences on page 565.
Controlling Previews with the Library Action Pop-Up Menu
You turn automatic preview maintenance on or o on a project-by-project basis.
To have Aperture automatically update previews in a single project only
1 In the Library inspector, select the projects whose photos you want to maintain previews for.
2 Choose Maintain Previews For Project from the Library Action pop-up menu (with a gear icon).
A checkmark appears next to the Maintain Previews For Project menu command. Aperture will
now automatically update previews when photos are imported into the projects, as well as when
versions are created or adjusted.
Note: Turning on automatic preview maintenance does not generate the previews. It only tells
Aperture what to do the next time a photo is imported or a version is created or adjusted. To
generate previews, you can use the shortcut menus described in Controlling Previews with
Shortcut Menus on page 116 .
Controlling Previews with Shortcut Menus
You can control previews in projects by Control-clicking a project in the Library inspector and
choosing an item from the shortcut menu that appears. In addition, you can control previews for
single photos or for a selection of photos by Control-clicking photos in the Browser.
In the Library inspector, you can delete all the previews for a project or update all the previews
for a project.
To delete all the JPEG previews for a project
m In the Library inspector, select the project whose JPEG previews you want to delete, then choose
Photos > Delete Previews for Project.
To update all the JPEG previews in a project
m In the Library inspector, select the project whose JPEG previews you want to update, then
choose Photos > Update Previews for Project.
If previews are already up to date and you choose Update Previews, Aperture alerts you that no
work is required. However, you can force the rebuilding of previews (see the following steps).
To force the rebuilding of JPEG previews in a project
m In the Library inspector, select the project whose JPEG previews you want to force Aperture to
update, hold down the Option key, then choose Photos > Generate Previews for Project.