One of the most beautiful galaxies in the sky NGC6744 is one I imaged recently but never was happy with the processing.
I reprocessed it and got a far better result.
For some reason there was a green gradient in the data - perhaps some misty thin cloud at one point. Thanks to Russell Croman's gradient Xterminator it was handled.
7 hours LRGB STL11 camera, RCOS 12.5 inch, Astrodon filters from my dark site observatory at 770 metres altitude which is quite high for Australia.
http://www.pbase.com/image/96539963
Greg.