Rendering preview images – Apple Aperture 2 User Manual
Page 201
Chapter 6
Displaying Images in the Viewer
201
II
Note: Because slideshows that use the Best quality setting cannot begin until all preview
images are up to date, preview generation is done in the foreground with a Cancel button
to stop the operation. In all other cases, previews are created in the background.
Rescheduling JPEG Preview Maintenance
For projects in which automatic preview maintenance is disabled, canceled previews
can be rescheduled.
To reschedule JPEG preview maintenance, do one of the following:
m
In the Projects inspector, select the project whose JPEG previews you want to start
updating again, then choose Images > Update Previews for Project.
m
Control-click the project, then choose Update Previews for Project from the shortcut menu.
Note: Each time you open Aperture, it checks for out-of-date previews in those
projects whose automatic preview maintenance option is enabled and then schedules
the previews for regeneration. If you don’t want previews updated automatically,
disable automatic preview maintenance for your projects. For more information, see
“
Controlling Previews with the Project Action Pop-Up Menu
Rendering Preview Images
Aperture renders preview images in four situations:
 When a library is upgraded—provided that the “Create previews for existing images”
checkbox is selected in the Welcome to Aperture dialog
 When an image is imported, or a version is created, rotated, or adjusted—provided
that the Maintain Previews item is enabled in the Project Action pop-up menu (with
a gear icon)
 When you Control-click the library, a project, or an image selection and choose
Update Previews from the shortcut menu
 Immediately before a slideshow, if the previews are not up to date, and the preset
uses the Best quality setting
When rendering a group of preview images, Aperture uses the current application
preference settings for compression quality and picture size, not the settings that were
specified when preview rendering began. For example, if you have the quality set to 6,
and then halfway through rendering you change the setting to 8, the previews that
have not yet been rendered will be compressed at setting 8. Already rendered previews
are unaffected.