Yes thanks for that Marek, I have Tom`s Rspec and very good it is. I think I might have not explained what I`m looking for adequately ;-).
I have the software such as Tom`s to create a profile from a horizontal spectrum such as the one above, what I was seeking from PI if possible is a way of bringing out the dark and light lines from the spectra I suppose what I`m looking for is a way of making the light lines brighter and the dark lines darker if that makes sense. I would liken it to trying to bring out the dust lanes of a faint nebula for instance and I`m assuming that somewhere deep within PI is a way of doing that, or maybe not ??.
Regards
Steve