Apple Aperture 2 - Manual (Page 404)

404 Part III Performing Image Adjustments
After adding a Crop overlay to an image, you can always change its size and shape.
To change the size and shape of a Crop overlay:
m Drag a resize handle on the Crop overlay to change the size of the crop.
You can adjust the placement of the crop by moving the Crop overlay across the image.
To adjust the placement of the crop:
m Drag the Crop overlay to the appropriate position.
You can also set the Crop overlay to a specific aspect ratio using the Crop HUD.
Drag a resize handle to
resize the Crop overlay.
Drag the Crop overlay
to adjust its position.