Apple Aperture Late-Breaking News - Manual (Page 17)

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Viewing Preview Generation Progress in the Background Task List Window
Aperture renders preview images in the background; however, there may be times
when you want to stop this operation. You can view the progress of the preview render
operation, as well as cancel this operation, in the Background Task List window.
To stop building previews:
1 Choose Window > Show Task List.
2 In the Background Task List window, select the “Processing previews” task, then click
the Cancel Task button.
3 Close the Background Task List window.
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 panel, select the project whose JPEG previews you want to start
updating again, then choose Image > Update Previews (or Control-click the project and
choose Update Previews 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Note: Each time you open Aperture, it checks for out-of-date previews in those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 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 ” on page 13.
Select this task, then click
the Cancel Task button.