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Its a really impressive image Doug, I mean really nice. Its worth that little bit of extra processing to bring up the colours.
Star colours are easier with CCD cameras I presume because they are 16 bit and 4 different filters. With DSLRs it can be a bit of a fight. If the image exposure is too long it seems the colour washes out. The 40D is 14bit so I bet a lot of that colour data is still there ready to be brought out.
Sometimes with CCD shots the stars seem to go all white too. But there is usually a bit of colour data buried in them that can be brought out. Othertimes the stars can be very colourful.
Tom Davis on this list is one processor who has mastered star colours. Look at his images and you'll see perfect star colour processing and notice how much it makes the image interesting.
Greg.
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