As with all CCD imaging, one is never happy with the results. As with the previous image. A bit 'blue' for my liking, and I am told a bit oversaturated, obscuring some of the detail. So, having spent even more time fiddling with the data I think I may have improved it a little.
Processed an combined in MaximDL, added luminance in Photoshop CS2, Noise reduced with Noise Ninja 2.
Some info on M 81