All I can find is 'Munsell Conversion - Version 6.22'. I've known this utility for quite a while now. But I did not think it would do the trick. Because, all along, I was under the impression that it could only convert FROM a Munsell notation TO Lab, XYZ, RGB, CMYK or xy. But now, thank's to you and my insistance, I've discovered that it can.
- Best way to convert your DXF to RGB file in seconds. 100% free, secure and easy to use! Convertio — advanced online tool that solving any problems with any files.
- Conversions between Munsell and RGB Systems. Here is a helpful online discussion about the problem of converting Munsell specifications to RGB coordinates. The discussion above suggested this free software for Munsell conversions. It is helpful for visualization, but only runs on PCs.
Description
xyYtoMunsell
Converts xyY coordinates into a Munsell specification, by interpolating over the extrapolated Munsell renotation dataUsage
Arguments
xyY | a numeric Nx3 matrix with CIE xyY coordinates in the rows,or a vector that can be converted to such a matrix, by row. These are for viewing in an environment with Illuminant C, with Y=100. |
xyC | a numeric 2-vector with xy chromaticity of Illuminant C.It can also be one of the strings given in MunsellToxyY() . |
hcinterp | either 'bicubic' or 'bilinear' (partial matching enabled).See MunsellToxyY() for details. |
vinterp | either 'cubic' or 'linear' (partial matching enabled).See MunsellToxyY() for details. |
VfromY | passed as the parameter which to the function VfromY() .See VfromY() for details.Option 'MGO' is not allowed because then Y>100 when V=10. |
warn | if an xyY cannot be mapped(usually because the root finder has wandered afar),its H and V are set to NA in the returned data.frame .Just before returning, if any rows have NA , and this argument is TRUE ,then a warning is logged. |
perf | if perf is TRUE , then extra performance related metricsare appended to the returned data.frame , see Value. |
Details
See
MunsellToxyY()
and the User Guide - Appendix C.Value
a
data.frame
with N rows and these columns:xyY | The input xyY |
HVC | the computed HVC. H is automatically wrapped to (0,100]. In case of failure, H and C are NA . |
SAMPLE_NAME | a character vector - the Munsell notation for HVC |
If
perf
is TRUE
then there are these additional columns:time.elapsed | elapsed time in seconds. If available, the function microbenchmark::get_nanotime() is used. |
iterations | the number of iterations of rootSolve::multiroot() |
evalations | the number of forward (HVC rarrow xyY) function evaluations Protein electrophoresis mnemonic. |
estim.precis | the estimated precision from rootSolve::multiroot() .This is in the HC plane for the Munsell Value easily computed from Y. |
If the rownames of xyY are not
NULL
and have no duplicates,they are copied to the returned data frame.Warning
Even when
vinterp='cubic'
the function xyY rarrow HVC is not C^1on the plane V=1.This is because of a change in Value spacing:when V≥1 the Value spacing is 1, but when V≤1 the Value spacing is 0.2.Author(s)
Jose Gama and Glenn Davis
Source
Paul Centore 2014The Munsell and Kubelka-Munk Toolboxhttp://centore.isletech.net/~centore/MunsellAndKubelkaMunkToolbox/MunsellAndKubelkaMunkToolbox.html
http://www.rit.edu/science/pocs/renotation
http://www.rit-mcsl.org/MunsellRenotation/all.dat
http://www.rit-mcsl.org/MunsellRenotation/real.dat
http://www.rit.edu/science/pocs/renotation
http://www.rit-mcsl.org/MunsellRenotation/all.dat
http://www.rit-mcsl.org/MunsellRenotation/real.dat
References
Judd, Deane B.The 1931 I.C.I. Standard Observer and Coordinate System for Colorimetry.Journal of the Optical Society of America.Vol. 23. pp. 359-374.October 1933.
Newhall, Sidney M.,Dorothy Nickerson,Deane B. Judd.Final Report of the O.S.A. Subcommitte on the Spacing of the Munsell Colors.Journal of the Optical Society of America.Vol. 33. No. 7. pp. 385-418.July 1943.
Kelly, Kenneth L.Kasson S. Gibson.Dorothy Nickerson.Tristimulus Specification of the Munsell Book of Color from SpectrophometricMeasurementsNational Bureau of Standards RP1549Volume 31. August 1943.
Judd, Deane B. and Günther Wyszecki.Extension of the Munsell Renotation System to Very Dark Colors.Journal of the Optical Society of America.Vol. 46. No. 4. pp. 281-284.April 1956.
Paul Centore 2014The Munsell and Kubelka-Munk Toolboxhttp://centore.isletech.net/~centore/MunsellAndKubelkaMunkToolbox/MunsellAndKubelkaMunkToolbox.html
See Also
MunsellToxyY()
,multiroot()
,get_nanotime()