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Not sure about the 400D but the 40D is relatively red sensitive for an unmodded DSLR.
You can try selecting curves in Photoshop and trying different curve shapes to bring up the red channel.
With the Omega Centauri image you can get rid of the gradients (the green background on one half and the red on the other) using Gradient Xterminator (it has a free trial and is the best tool there is for that).
You can also do gradient removal in Photoshop.
There is a free tutorial on it I think it is called Wade Observatory or google gradient removal tutorial. But really nothing works as well as Gradient Xterminator.
Greg.
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