Apple Aperture Late-Breaking News - Manual (Page 15)

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To force the rebuilding of JPEG previews in a project:
1 In the Projects panel, hold down the Option key while Control-clicking the project
whose JPEG previews you want to force Aperture to update.
2 Choose Generate Previews for Project from the shortcut menu.
In the Browser, you can select one or more images and either delete or update the
JPEG previews.
To delete JPEG previews for an image selection:
1 In the Browser, select an image or group of images whose JPEG previews you want
to delete.
2 Control-click the image selection, then choose Delete Previews from the shortcut menu.
Hold down the
Option key while
Control-clicking a project
to make Generate
Previews for Project
appear in the
shortcut menu.
Choose Delete Previews.