Open Aperture preferences
Choose Aperture > Preferences, then click Previews.
The Previews pane appears.
For more information about the Previews pane, see Previews preferences.
Aperture provides four preference settings for controlling previews. These settings apply to all libraries.
Choose Aperture > Preferences, then click Previews.
The Previews pane appears.
For more information about the Previews pane, see Previews preferences.