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Then you have destroyed what it means to be quantitative. A range implies that two things can be measured with the same kind of measurement. Sweet and sour cannot be measured with the same kind of measurement. Indeed, they are perceived by the same sense mode, but this is exactly what I mean by qualitative aspects that are not dependent on some prior (implicit) measurement. This is not precise enough. I'm going to assume that you already know that cones of the eye are not sensitive to specific colors per se, but sensitive to a range of wavelengths, ranges of wavelengths that we name as colors by convention. But those cones are not sensitive to anything else about color, particularly the impact of luminosity and saturation. That part of perception occurs further in visual processing. For this reason, we can't say that cones are "just" specialized for certain colors. Instead, they are "just" specialized for certain wavelengths. In some way, your body does "care" that the colors are on a spectrum, that's what makes it possible to compare colors in a fully commensurable way! Not to mention that specialization to "just" different colors would only add further support to what I'm saying: your body is capable of detecting differences of kind (without reliance on a quantitative feature) in addition to differences of quantitative measurement. Color perception is so complex that qualitative differences might be a better picture to the whole story. I was confident enough to say that it is a quantity, but I think after reading your post just now, I wouldn't call it a quantity anymore (I like your last sentence). It doesn't alter the point I was getting at though, so everything else I wrote stays the same.

Never fear, the Gods of the Copybook Headings always put things aright again.