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In color perception Invariant hues (or invariable hues ^[1]) are perceived[ [hues]] of monochromatic light that do not change with intensity, that do not show the Bezold–Brücke shift, that is, do not change with changes in illumination.

There are four invariant hues: blue, green, yellow, and red&nbsp The four invariant hues are:

• 478nm (blue)
• 510nm (green) ^[2][3]
• 578nm (yellow)
• 493c (red; i.e. complementary wavelength to 493nm)^[4]

References

1. ↑ Reber, A.S. & Reber, E.S.(2001) The Penguin Dictionary of Psychology
2. ↑ Pridmore, R.W. (1999)."Bezold-Brucke hue-shift as functions of luminance level, luminance ratio ....etc" .Vision Research ;39:3873-3891.
3. ↑ Kuehni,R. (2004) "Variability in unique hue selection: A surprising phenomenon." Color Research & Applic ; 29:158-162
4. ↑ Pridmore, R.W. (1999)."Bezold-Brucke hue-shift as functions of luminance level, luminance ratio ....etc" .Vision Research ;39:3873-3891.

Further reading

Pridmore, R.W (1999). "Unique and binary hues as functions of luminance and illuminant color temperature, and relations with invariant hues." Vision Research ;39:3892-3908.