This was a very good reply to a Lux forum question I had, but I don't know enough to fill in the details of the explanation. Can someone give a more detailed explanation of the process? I know how to get the Photoshop contrasty image, but am unsure of what to do in modo. A small version of the original image is in the Lux thread.
EDIT: never mind, I got a very good elaboration at the Luxology thread above.