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>
>I see hexadecimals as absolute, even though our perception of them depends
>on the monitor being used and its settings. In the same sense, then, PMS
>numbers are absolute, even though our perception of them depends on the
>medium they are printed on, the light source, etc.
>
Er, um, absolutes, huh? Well, sorta.
Red, green, and blue are defined spectral lines with known wavelengths. So, yes, they are absolute in the sense that they can be measured with instruments (with whatever margin of error is inherent in the measurement process).
PMS colors (either kind), also vary within extremely small neighborhoods in color space, because the people at Pantone do a great job producing their books (involving accurate scaling of inks, accurate press work, etc.). But PMS colors are defined in terms of visual matching of one sample with a reference standard (the PMS book), not in terms of numbers. Still, I suppose you could say they are absolute within the margin of error of the equipment used.
The "equivalence" between the two systems depends on whose theory of color perception you subscribe to and therefore what algorithm you use to do the conversion; and, in any case, cultural and individual differences between people affect what we see as "same" when viewing additive and subtractive color renditions.
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