Perhaps, I've misread it, and if not it might add fuel to conspiracy theories, but is it correct that the Global Surveyor, pretty much unlike most color cameras constructed, does not show the green color, but only the red and the blue?

If I read a quote like below than I would conclude: no green.
found at http://marsprogram.jpl.nasa.gov/mgs/...2_Science_cvr/


If that's true, is there a reason for it? For me, not being an expert on photography, mind you, it seems unusual to have chosen that as a technological choice.

It's true that the wide-angle camera is two-color (the narrow-angle camera is black-and-white). I couldn't find an explanation why.

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The Viking cameras must have been the same. I've plenty of the NSSDC CD-ROMs, some with color. The description said, they used red and blue images and a synthetic green to make them. Could it be that Mars through a green filter is pretty unstructured so it would be a waste to make green filter images?

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"Flying in space is risky business, but just staying on this planet is risky business too." - John Young, astronaut

According to this website, the Vikings did have RGB coloring (just a brief impression based on the charts there):
http://mars-news.de/color/filter.html

Thanks. Then maybe they took green images not so often for the reason I thought of.

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"Flying in space is risky business, but just staying on this planet is risky business too." - John Young, astronaut