Hmm, I'm not going to attempt to figure it out, because I don't have time.
But, my initial thought process flows in the direction that each coloered pixel has a numeric value or a pantone number or something of the sort. Then, hmm, perhaps there is an identifiable pattern to the number combinations (the colors that are next to each other.) That pattern could then ultimately lead to a cross ref to the alphabet. But, I'm sure there is some high level mathematics in there as well that you need to plug these numbers into.
That's about where the flow stops. If I think of anything else I'll post, but doubt I will.