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As I understand, on ordinary monitor I could only see a subset (e.g. sRGB) of the horseshoe shape of visibile color.

Is there any lab device that could generate all the visible colors and project them onto the CIE 1931 chromaticity diagram?

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    It's theoretically doable, but only as an emissive device and it would be incredibly expensive, It isn't even theoretically possible for reflective (passive) surfaces due to Macadam limits. – doug Feb 10 at 8:17
  • @doug how would you do it, even theoretically? All the points around the edge of the horseshoe would need to be a pure single frequency of light. – Mark Ransom Feb 12 at 5:15
  • @MarkRansom Of course. But one can approximate it well within arbitrary dE limits below perceptual level with much fewer single freq. sources. Since the xy chromaticity of two wavelengths follows along a line between the two on the horseshoe one just needs to increase the density where the curve is greatest. Probably doable with well under 100 specific wavelengths such that max dE would be under 1. It's obviously not practical but would certainly be possible. – doug Feb 12 at 5:48

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