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Yes, sorry Steve, I did mean around the edges of the frame. To me it looks like amp glow, which is when the sensor heats up to much during a long exposure and "leaks" into the image. Next time I would try and let the camera cool down longer between exposures and I would also try doing separate dark frames at the end of the night and not use in camera noise reduction. To try and remove it from this image I would use the selective colour tool in Photoshop to pull down the magenta slider in both the red and magenta channels. The image would probably look fairly green so I would also then either have a play with the green channel or just use the free "Hasta La Vista Green" Photoshop filter plugin to remove the green. I would have also duplicated the image before I started playing with it, so that I could mask back in those magenta nebula regions that would be effected by the above actions.
What image editing software do you have access to? If you would like, with your permission, i could have a play with this image and detail the steps I took. I'm by no means an image editing expert but I'm happy to help if I can.
Cheers
Greg
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