I think the colour in the background is the real issue not the star colours. I think the first star colours were ok. To remove the green in the background you can get a plug in for PS called deep sky colours (HLVG). Sorry I don't have a link for you.
I do wonder though what you are trying to do about the tilt you have in image? This really spoils the image so much. It does make the stars look a little out of focus. Which is a real shame as the rest of the data is pretty good Martin. Are you using a field flattener too? I cannot remember what you are using. Jus want to see your work really shine. Please don't be offended by this.
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