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Portraits!
There's 187 of them, the remaining ones either crash the game or render as glitched graphics.
So the colors swap like this:
And to uncorrupt it, you just do it again, which of course swaps them right back.
And the way that trick works (without a lookup table or anything like that) is right here:
See those highlighted 16 colors? They're the palette for this image. To corrupt a color, it just inverts the index.
if you know what this means, please call our 1-800 number immediately. trained operators are standing by.