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Bert, that is an interesting point that colours don't exist.
But as far as what we'd see if we approach a galaxy, I think that's limited to "how" we see. We either look at the object with our eyes or use sensitive cameras to look at the same object and since both methods use our eyes, I think its safe to say that astrophotography images are a close enough representation of what's visually there, with variations in sensitivity / colour interpretation.
when we're looking at the light from a galaxy that left millions of years ago, its pretty much an extension of that galaxy and would be the same if we were to use the same camera in a spacecraft close to the galaxy millions of years ago.
I've always wondered about post processing AP images and how we tweak colours to achieve a pleasant or "correct" colour interpretation, but if our OSC cameras are correctly designed, do we really need to correct colour that much?
Its like audio amplifiers, you could have a 25 band graphic equalizer to adjust various frequencies, but the professional ones don't use tone controls and are designed to have a flat response at all frequencies and that delivers a natural output.
Only difference is that our ears are less sensitive to the lows and highs and that's why you'll see the graphic equalizer sliders adjusted to a "U", where the lows and highs are amplified relative to mids for our ears.
again, modifying the signal to suit our ears.
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