Just thought I'd share this, in order to make things a little easier for anyone who attempt the same thing. I just followed the instructions on
Bob Franke's webpage and automated it.
As used in the following images:
http://www.iceinspace.com.au/forum/s...d.php?t=181486
http://www.iceinspace.com.au/forum/s...d.php?t=181430
Just start with an RGB image that is setup as
S->R
H->G
O->B
Then run the action over it.
I've set this up in Photoshop CC 2020, but it should work on older versions of CC.
https://github.com/RobertPascale-Ast...otoshopActions
In future, if I think of anything useful to add, I'll update the actions.