Note: The exact definition gives Y as a fifth-power function of V, so that tabular or iterative methods are needed to find V as a function of Y. However, V can be estimated within ± 0.1 by V=11.6 (Y/100)1/3 – 1.6, or within ± 0.6 by V=Y1/2, where Y is the luminance factor expressed in percent.
* Newhall SM, Nickerson D, Judd DB. Final Report of the O.S.A. Subcommittee on the Spacing of the Munsell Colors. Journal of the Optical Society of America. Jul 1943;33:385.« Back to Definitions Index