Am 26.11.2016 um 17:13 schrieb Mike Horvath:
> How do you plot this horseshoe shape? Is the diagram plotted in CIE XYZ
> or CIE xyY color space?

It can be considered a plot of CIE xyY at some arbitrary unity Y.

Alternatively, it can be considered a plot of the slice X+Y+Z=1 of the
CIE XYZ colour space projected onto the XY plane.

> How do you tell if a point is inside or outside
> this curve?

By comparing against empirically established tables. There's no way
around that.

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