Keys for using the Clone Source

Show Clone Source (overlays image)

Alt + Shift

Opt + Shift

Nudge Clone Source

Alt + Shift + arrow keys

Opt + Shift + arrow keys

Rotate Clone Source

Alt + Shift + < or >

Opt + Shift + < or >

Scale (increase or reduce size) Clone Source

Alt + Shift + [ or ]

Opt + Shift + [ or ]