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ABSTRACT For purposes of data analysis and data interpretation, it is important to have uniform representation of hue derived from the Hunter L, a, b color space. Using the standard calculation for hue Arc tan (b/a), positive signed results are generated for the first quadrant +a, +b only. The other quadrants should be handled so that a 360° representation is accommodated and results are expressed as positive signed numbers. Second quadrant ‐a, +b and third quadrant −a, −b calculations should be: hue = 180+Arc tan(b/a). Fourth quadrant +a, −b calculations should be: hue = 360+ Arc tan(b/a). Furthermore when planning statistical analysis of data which transverse the IV and I quadrant, tranformations of the data will continue increasing in hue angle from 361° on up as high as appropriate. A spreadsheet macro for achieving these results can be easily derived.
McLELLAN et al. (Thu,) studied this question.