## CIE (2012) 2-deg “physiologically-relevant”
xyz chromaticity coordinates

### Data key

**Columns**

- Wavelength (nm)
- chromaticity
coordinate
- chromaticity
coordinate
- chromaticity
coordinate

### Notes

The CIE (2012) 2-deg
“physiologically-relevant” , , and chromaticity
coordinates are related to the CIE (2012) 2-deg , and CMFs by:

The , and CMFs are linear
transformations of the cone fundamentals according to:

where , and are the Stockman & Sharpe
(2000) or CIE (2006) 2-deg cone fundamentals tabulated here.

The proposed CIE standard is also concerned about defining the
precision of the CMFs. Thus, the coefficients of the
transformation are defined to 8 decimal places (as in the equations above), the
CMFs themselves are calculated from the cone fundamentals given in linear (energy) units
to 9 sf (given here), and the
results in linear (energy) units are tabulated to 7 significant figures. Finally,
the chromaticity coordinates are defined to 5 dp.

The functions are provided here at 0.1, 1
and 5 nm steps.

Please note that these are proposals that have yet to be
ratified by the full TC 1-36 committee or the CIE.

### References

Stockman, A., & Sharpe, L. T.
(2000). Spectral sensitivities of the middle- and long-wavelength sensitive
cones derived from measurements in observers of known genotype. *Vision
Research*,* 40,* 1711-1737.

CIE (2006). Fundamental chromaticity
diagram with physiological axes. Parts 1 and 2. Technical Report 170-1. Vienna: Central
Bureau of the Commission Internationale de l' Éclairage.