The loci in CIE space of colors with a given difference from a standard are
calculated from the Adams-Nickerson equation. The calculation is carried out by
means of a point-by-point transformation from an intermediate chromatic value
space to CIE space. Digital computers are used for the entire calculation and
transformation. The calculated quasi-ellipsoids may be compared with those
observed by Brown and MacAdam. For routine decision work, an approximation
involving the intersection of three right cylinders based on projections of the
original ellipsoid is employed.
© 1957 Optical Society of America
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