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A comment on How to Choose Colours Procedurally. Parent comment

Re:How to Choose Colours Procedurally by taliesinb on Monday September 02, 2013 @08:32AM (#6314838)
You can look at it that way. You can also see it as a modification of cylindrical LAB.

Explain your "slightly rotated" comment?

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Re:How to Choose Colours Procedurally by jacobolus on Monday September 02, 2013 @11:58PM (#6318782)
From Lindbloom’s site: “The mapping was done such that Munsell hue 2.5RP has a UP Lab hue angle of zero degrees. This particular rotation was chosen to allow greater chroma encoding of blue colors in the lower right quadrant of the a/b plane.”

Also, to be completely precise, it should be noted that the lightness dimension of UPLab was left the same as CIELAB’s lightness, rather than using Munsell value. Only a and b were adjusted to reflect Munsell hue/chroma.

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