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It takes quite a bit more light energy entering our eyes for our colour receptors to respond and see colour, than for our black and white ones to respond. Plus we have many more black and white receptors than colour. (they are called rods and cones, but I can never remember which is which).
Even in really big telescopes (and I mean BIG) the colour from even very bright neb is never like what we see in photos.
I've often wondered why someone hasn't taken telescope manufacturers to the cleaners over the blattant false advertising on the outside of their boxes. You will never see images of nebula and galaxies with the nacked eye as they are portrayed there.
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