AP1 was designed to produce more reasonable ‘RGB’ grading (so that the dials move in the direction of R and G and B), to pick up critical yellows and golds along the spectral locus (to get that entire edge of the locus), and to clearly encompass Rec.2020 primaries by just a small amount. (in addition to the other comments above). Getting rid of the negative blue primary location in AP0 was also a goal.
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