Hey ho Duncan, just wish I had found this thread when I started out. Impetuous me. No thought about how the image would be recorded and then how to get it to B&W, although I did know from one of Sassan's pics that channel mixing was involved.
I am a bit of a numpty in CS so the Persimon pic was mainly done in NX2. As some info in that direction may be useful to Andy when he gets his camera, I have done a series of screen grabs of the route I took in NX2.
Attached is a set of 5 screen grabs.
Don