Well, I should be out shooting but an impending storm sent clouds early, just 20 minutes into the Red channel of M45. New images will have to wait. Instead I'll offer up this experiment I did on combining Ha with RGB as my early efforts using Ha as the L were never very pleasing. I had meager data to work with so not a very fair test, but thought you might enjoy it.
Larry
http://www.freewebs.com/drivewayastronomy/workspace.htm
Larry
http://www.freewebs.com/drivewayastronomy/workspace.htm