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Gday Sandy
Some answers that may be of use. Firstly I am pretty sure that NR in Canons is a good approximation of dark frame subtraction (I am not a DSLR man tho)
IN CS2 try image->adjustments->color balance and play around with the sliders to see what they all do. Dropping the red makes a big difference in your image (I just did it) especially in mid tones and highlights - just click on the radio button to change them then move sliders
The darkened edges are probably some form of vignetting due to the combination of otics and camera (As I said I am not a DSLR guy but this is what I would say it is - I am ducking here in case I am wrong but I am pretty sure DSLRs suffer fom this as CCDs do). Flat Frames will fix it if it is vignetting. unfortunately I have no idea about Canon S/ware and what it is capable of - others may be able help. Google flat frames and you get an absolute mile of info on how to do it.
Anyway this may be some starting points for you
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