Only things like color balance and maybe reduction of vignetting on the scan. The original was done with 35 mm film and printed on old-fasioned photographic paper. The comet, the star cluster, and the moon were all there, though the crescent moon is grossly overexposed and just looks like a bright blob.

I was a fanatical astrophotographer back in the early 198o's. Here's my astrophoto page with some examples: http://members.aol.com/petealway/Astrophotos.htm