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Originally Posted by Ut
Hrmm, since this has been brought up...
I've always wondered why they don't have some sort of white calibration reference in the photos. Through the filters, it'd look red, blue, or green. Combining the three images and adjusting until the reference was white should give you true colour, shouldn't it? Of course, if it were so simple, it'd be that simple.
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People do stick colour calibration charts on these beasties. (The Damian Hurst one on the ill-fated Beagle 2, for example.)
What your method does is correct to apparent reflectance, which is more directly related to material properties than "true colour", and hence in some ways, more useful.
