JGC:

...are equally artificial, but like 'race' they're useful intellectual constructs which allow us to better organize and manipulate complex ideas. It isn't surprising that different cultures would use a commonterm to convey different meanings, or that in the absence of the ready ability to discriminate on the basis of genotype they would apply the term on the basis of phenotype.

And of course we often can't ever know whether or not an individual in a photograph is 'truly' white, but why would one feel a need to?

I agree with this also-so it is all a matter of perception because the perception that the woman on the cover is "whte" and the man is "black" is the underlying basis of this discussion.