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If you are interested, take a look at this fascinating -certainly in the context of this discussion- article from a few years ago, the "White's Illusion" that plagues the human brain can also occur in "any system that tries to emulate human vision." (quote from the article, emphasis mine)

So what does it say about me that "White's Illusion" looks like two equally grey boxes to me. I have to really do some concentrating to get the one on the left to look darker.

The first paragraph says "Like most people, you should see one block of grey as darker than the other," it just means you're not like most people, as far as your vision goes, your vision is more accurate the the physical world than most people's. Everybody is different one way or another, and even people with very "correct" vision will sense colors slightly differently from each other.