Digital BW, The Print

Victor writes:

> Second is that, when you hold down <alt>/<option>
> while dragging the black and white points up and 
> down, Photoshop shows you the actual parts of the
> image that will be clipped. Try it if you don't
> already know about it. You'll be amazed!

This option apparently doesn't work under Windows except in 256-color mode.