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As you can see from my images of M27, I cannot capture the red on the fringes of the 'bubble', which you seem to have done very well. I have tried increasing the red saturation and messed with the hue etc. but that only messes with the colour balance of the overall image. I believe that the EOS Rebel XS (1000D) is very similar to my 450D in all but a small reduction in pixels, so have you any ideas as to what I am doing wrong (I am assuming that your Rebel is unmodified wrt the IR blocking filter)?
Appreciate any suggestions,