Apple Aperture - Manual (Page 161)

Chapter 6 Displaying Images in the Viewer 161
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To change preview options:
1 Choose Aperture > Preferences, or press Command-comma (,).
2 In the Previews area of the Preferences window, do any of the following:
 To set Aperture to create previews for the images in all new projects and new
Libraries: Select the “New projects automatically generate previews” checkbox.
Deselect this option if you don’t want previews created for images in new projects.
 To enable sharing of JPEG preview images with other applications: Select the “Share
previews with other applications” checkbox.
 To change the image quality of the previews: Drag the Preview Quality slider. The
higher the quality you select, the more disk space the preview requires.
3 Close the Preferences window.
You can turn the creation of preview images on for specific projects in the Projects
panel or for the entire Library, and Aperture automatically creates previews as new
versions are created or modified. When a preview exists for an image, you can drag it
into other applications.
To turn the creation of previews on or off for specific projects:
1 Select the project or Library in the Projects panel.
2 Choose Maintain Previews for Project from the Project Actions pop-up menu to turn
high-resolution preview creation on or off.
A checkmark beside the command indicates that high-resolution preview creation is
turned on.
To turn the creation of previews on or off for the entire Library:
1 Select the Library in the Projects panel.
2 Choose Maintain Previews for All Projects from the Project Actions pop-up menu to
turn high-resolution preview creation on or off.
A checkmark beside the command indicates that high-resolution preview creation is
turned on.
You can also have Aperture create or update previews for selected images. When you
turn the creation of previews off, Aperture does not delete previews that were created
previously. It stops creating new previews from then on.