Hi
All the colour in this one comes from RGB data, colour balanced on foreground stars and with blue pushed a little to partially compensate for the dust extinction. It was composed using the RGB colour data and Ha as luminance, so the stars have essentially undefined outer regions - minimised as much as possible, but still noticeable.
full res:
http://www.astrobin.com/full/247005/None/?real=&mod=
Thanks for looking. Regards Ray