Operation Manual

2 Control-click the image selection, then choose Delete Previews from the shortcut menu.
To update JPEG previews for an image selection
1 In the Browser, select an image or group of images whose JPEG previews you want to
update.
2 Control-click the image selection, then choose Update Previews from the shortcut menu.
You can also force the rebuilding of previews for an image selection.
To force the rebuilding of JPEG previews for an image selection
1 In the Browser, select an image or group of images whose JPEG previews you want to
force Aperture to update.
2 Hold down the Option key while Control-clicking the image selection, then choose
Generate Previews from the shortcut menu.
Note: The commands for deleting, updating, and generating previews are also available
in the Photos menu.
Viewing Preview Generation Progress in the Activity 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 the operation, in the Activity window.
To stop the building of previews
1 Choose Window > Show Activity.
2 In the Activity window, select the “Building JPEG previews” task, then click the Cancel
Task button.
3 Close the Activity 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.
243Chapter 6 Displaying Images in the Viewer