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Hi Robert
I think that there are astrophotographers who de-bayer their images from the raw capture mode to preserve the equivalent B&W resolution, but then they seem to end up with a B&W image with a grid pattern overlaying the image, which is the bayer grid.
Image processing can somehow either minimise or remove these artifacts from what I understand.
As far as I know, the only colour ccd that can "match" a B&W ccd is where there are 3 stacked, separate physical layers than register R, G & B so that resolution is not lost. They are very rare and expensive.
Hopefully someone who has a clearer and deeper understanding of the specific issues you have asked about can provide more details, as my knowledge is a little piece meal from casual reading.
Cheers
Dennis
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