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The statement I take objection to is this:

> The fact that colors influence colors around them means that there are far more than 256^3 viewable colors: the spatial axis is like a fourth channel.

That the perception of color is influenced by surrounding colors is true, but that this adds a "fourth channel" is [citation needed].

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I'm not sure I buy that it means there are more absolute viewable colors there, but rather there are merely different interpretations of the same colors. We do have fairly strong confirmation that our brain doesn't interpret color absolutely but can adjust based on luminescence (see: all examples of shadow illusions) and patterns (see: https://www.youtube.com/watch?v=mf5otGNbkuc), perhaps that's what is meant by a "fourth channel"?

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