Scroll image with grabber

Center image

Spacebar + click

Spacebar + click

Zoom in

Spacebar + Command + click

Spacebar + Ctrl + click

Zoom out

Spacebar + Command + Option + click

Spacebar + Ctrl + Alt + click

Rotate image

Spacebar + Option + drag

Spacebar + Alt + drag

Constrain rotate to 90 degrees

Shift + Option + Spacebar + drag

Spacebar + Alt + Shift + drag

Orient screen to default view

Shift + Option + click

Shift + Alt + click