If similarity relations among colors are fixed by neural opponent-process structures rather than by physical reflectance properties, then color similarity judgments have false presuppositions about their own subject matter.

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color similarity judgments(as used in epistemology and philosophy of perception): The opinions or assessments we make when we decide whether two colors look similar to each other.
false presuppositions(as used in logic and philosophy of language): Hidden assumptions that something assumes must be true, but actually aren't—like if you asked 'Is that unicorn blue?' you'd be falsely presupposing that unicorns exist.
neural opponent-process structures(as used in neuroscience and philosophy of color): A system in your brain where certain color receptors work in opposing pairs (like red vs. green, blue vs. yellow), which might be what actually determines how similar colors seem to us.
physical reflectance properties(as used in philosophy of perception): The actual, measurable way objects bounce different wavelengths of light—the objective physical facts about color that exist independent of our perception.

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