Rowland you make some good points and they probably explain why my individual subs look so bright and dynamic and the stacked end produce looks dull and dark. I do use bias frames, darks, and occassionally flats, but I hear so much conflicting opinions on this. I accept there is probably one technique for DSLRs (Canons), and another for CCD camera image processing. My setup/preferences in DSS may also be part of the problem. I still have no idea which of the stacker apps is the best choice for my images, they all seem to have their fans.
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