Operation Manual

Rescheduling JPEG Preview Maintenance
Preview maintenance can be rescheduled for projects in which automatic preview
maintenance is turned off.
To reschedule JPEG preview maintenance
Do one of the following:
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In the Library inspector, select the project whose JPEG previews you want to start updating
again, then choose Photos > Update Previews.
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Control-click the project, then 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Note: Each time you open Aperture, it checks for out-of-date previews in those projects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 turned on and then schedules the
previews for regeneration. If you don’t want previews updated automatically, turn off
automatic preview maintenance for your projects. For more information, see Controlling
Previews with the Library 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 selected in the Library 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 slideshow
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. Previously rendered previews are
unaffected.
To update previews to use new size and compression settings
1 In the Browser, select the images you want to update.
2 Hold down the Option key while Control-clicking the image selection, then choose
Generate Previews from the shortcut menu.
244 Chapter 6 Displaying Images in the Viewer