Looking at the channels, the blue suffered the most - that's ok, blue is the hardest to get focussed anyway. You've got some colour balance work to do - when you use the RGB combine in Astra Image, do you adjust the colour weights? I normally leave red at 1.0 as a reference and then adjust the other two until I get a colour that's close to what I want.
The only mind-bending part is that you reduce the amount of a colour by *increasing* it's value, seems backwards to me but that's the way they did it...
For reference the rings should be a sort of blue-white colour and the planet a light yellowish-brown.
Bird
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