When you adjust images in a book in Aperture, the controls may respond slowly, making the images difficult to edit.
As a workaround, edit images in the Viewer, where the controls will respond much more quickly. To do this:
- In the album, select the thumbnail for the image you wish to adjust.
- Click the "Show Viewer for this Browser" button near the top-left of the Browser.
Your selected image replaces the album page in the Viewer. - Press F to enter full screen mode, then make your adjustments.