File:Lightness approximations.svg Source: en.wikipedia.org/wiki/File:Lightness_approximations.svg

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Summary

Four Lightness scales plotted as functions of normalized luminance. Munsell Renotation; ^[1] a fifth-order polynomial in Munsell Value; Hunter's rational function; ^[2] Square Root; ^[3] and Ladd and Pinney's modified cube root^[4] are shown. Ladd and Pinney's modified cube root is truncated (no negative values appear).

Licensing

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References

^ S M Newhall, D Nickerson, D B Judd, "Final report of the OSA subcommittee on spacing of the Munsell colors." Journal of the Optical Society of America, 33:385 (1943).
^ Dorothy Nickerson, "Munsell renotation used to study color space of Hunter and Adams." Journal of the Optical Society of America, 40:1:85 (1950).
^ I G Priest, K S Gibson, H J McNichols, "An examination of the Munsell color system. I: spectral and total reflection and the Munsell scale of Value." Technical paper 167, United States Bureau of Standards, 1920.
^ J H Ladd and J E Pinney, "Empirical relationships with the Munsell Value scale." Proceedings of the Institute of Radio Engineers, 43:1137 (1955).

[Newhall1943-1] S M Newhall, D Nickerson, D B Judd, "Final report of the OSA subcommittee on spacing of the Munsell colors." Journal of the Optical Society of America, 33:385 (1943).

[Nickerson1950-2] Dorothy Nickerson, "Munsell renotation used to study color space of Hunter and Adams." Journal of the Optical Society of America, 40:1:85 (1950).

[Priest1920-3] I G Priest, K S Gibson, H J McNichols, "An examination of the Munsell color system. I: spectral and total reflection and the Munsell scale of Value." Technical paper 167, United States Bureau of Standards, 1920.

[Ladd1955-4] J H Ladd and J E Pinney, "Empirical relationships with the Munsell Value scale." Proceedings of the Institute of Radio Engineers, 43:1137 (1955).

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