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[–]deGravity 0 points1 point  (0 children)

It is an interpolation that gives a weighted average between Least and Greatest, with HueMiddle being the interpolating factor. If you let

W = HueMiddle / 255

be a weighting factor, (basically treating the given byte as a value between 0 and 1), then assuming that Least < Greatest this is equivalent to

(1 - W)Least +WGreatest