Apple Aperture - Manual (Page 162)

162 Part II Photo Editing
To create or update previews for selected images:
1 In the Browser, select the images you want to update with new previews.
2 Choose Images > Update Previews.
Note: You can also force Aperture to update previews for images by selecting the
images you want to update and then holding down Option and choosing Images >
Generate Previews from the shortcut menu.
You can also delete the previews for selected images.
To delete the previews for selected images:
1 In the Browser, select the images whose previews you want to delete.
2 Choose Images > Delete Previews.
Quickly Accessing Commands
You can access commands via a shortcut menu, as an alternative to using the menu bar
at the top of the screen or pop-up menus within a window.
To view the shortcut menu:
m Position the pointer over the Viewer, then Control-click (press the Control key and click).
Note: Although accessing commands from shortcut menus can help you work more
quickly, keep in mind that not all commands are available in shortcut menus.