Thanks for the comments Nick and Louie
I noticed a lot of images of Lagoon were processed in this colour so I had a try at it myself.
I'm just a beginner in this processing game so any hints are welcome
We're working with very basic equipment. Just the Skywatcher 8" Newt EQ5 mount with dual drives with a " rack and pinion focuser "

and the basic Pentax ist DL.
Barb