Rgb To Munsell Converter Weight

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  1. Rgb To Munsell Converter Weight Calculator
  2. Munsell To Ral Color Conversion

Munsell To Rgb Color Conversion; Pms To Rgb Converter; Color code converter. Color code converter. HEX value is 6 digits (rrggbb). RGB values are in range of 0.255. Temperature conversion. How does one take a color expressed in an RGB value (say, three coordinates from 0-255) and produce from it a color temperature in kelvin (or mireds)? To convert from Munsell to sRGB, rst use the Munsell renotation to nd the corresponding CIE coordinates for that Munsell colour. Then use the sRGB standard to convert from those CIE coordinates to sRGB coordinates. Tables 1 through 41 show these results. When the cells in the table are shaded grey, clipping was needed to produce the sRGB triple. Non-standard Munsell notation (e.g. '7.9YR 2.7/2.0') can be matched (nearest-neighbor, no interpolation) to the closest color within the munsell sRGB/CIELAB look-up table via getClosestMunsellChip. A more accurate estimate of sRGB values from non-standard notation.

Description

MunsellToxyY Converts a Munsell specification into xyY coordinates, by interpolating over the extrapolated Munsell renotation data

Munsell converter

Usage

Arguments

MunsellSpec

a numeric Nx3 matrix or a vector that can be converted tosuch a matrix.Each row has Munsell HVC, where H is Hue Number,and V and C are the standard Munsell Value and Chroma.The Hue is automatically wrapped to the interval (0,100].MunsellSpec can also be a character N-vector with standard Munsell notation; it is converted to an Nx3 matrix.

xyC

a numeric 2-vector with xy chromaticity of Illuminant C.It can also be one of the strings in the first column of this table;it is then replaced by the corresponding xy in the second column.

xy white point reference
'NBS'c(0.3101,0.3163) Kelly, et. al. [RP1549] (1943). Rheinboldt et al. (1960)
'JOSA'c(0.31012,0.31631) Judd, Deane B. (1933)
'NTSC'c(0.310,0.316) NTSC (1953)
'CIE'c(0.31006,0.31616) CIE:15 2004

The default 'NBS' is probably what is intended by Newhall et. al.although no xy for C appears in that paper.This is the C used in the first computer program for conversion:Rheinboldt et al. (1960).The other options are provided so that a neutral Munsell chip has the xy thatthe user expects. Alternative values of xyC should not be too farfrom the above.If hcinterp is 'bicubic',this parameter only affects chips with Chroma < 4 (except Chroma=2).If hcinterp is 'bilinear',this parameter only affects chips with Chroma < 2.

hcinterp

either 'bicubic' or 'bilinear' (partial matching enabled).In the bicubic case, for a general input point, the output value is interpolatedusing a 4x4 subgrid of the lookup table, and the interpolation function is class C^1(except at the neutrals).In the bilinear case, the interpolation uses a 2x2 subgrid,and the function is class C^0.

vinterp

either 'cubic' or 'linear' (partial matching enabled).In the cubic case, for a general input point, the output value is interpolatedusing 4 planes of constant Value, and the interpolation function is class C^1.In the linear case, the interpolation uses 2 planes and the function is class C^0.

YfromV

passed as the parameter which to the function YfromV().See YfromV() for details.Option 'MGO' is not allowed because then Y>100 when V=10.

warn

if a chip cannot be mapped (usually because the Chroma is too large),its x and y are set to NA in the returneddata.frame.Just before returning, if any rows have NA, and this argument is TRUE,then a warning is logged.

Details

In case hcinterp='bicubic' or vinterp='cubic' a Catmull-Rom spline is used;see the article Cubic Hermite spline.This spline has the nice property that it is local and requires at most 4 points.And if the knot spacing is uniform:1) the resulting spline is C^1,2) if the knots are on a line, the interpolated points are on the line too.

Value

a data.frame with these columns:

SAMPLE_NAME

the original MunsellSpec if that was a character vector.Or the Munsell notation string converted from HVC.

HVC

the input Nx3 matrix

xyY

the computed output matrix, with CIE xyY coordinates of MunsellSpec illuminated by Illuminant C. In case of error, x and y are set to NA.

Warning

Even when vinterp='cubic' the function HVC rarrow xyY 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.

Note

When making plots in planes of constant Value,option hcinterp='bicubic' makes fairly smooth ovals,and hcinterp='bilinear' makes polygons.The ovals are smooth even when vinterp='linear',but the function is not class C^1 at the planes of integer Value.To get a fully C^1 function (except at the neutrals and on the plane V=1),hcinterp and vinterp must be set to the defaults.

Author(s)

Jose Gama and Glenn Davis

Source

Munsell color chart online

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

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.

Rgb To Munsell Converter Weight

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.

National Television System Committee.[Report and Reports of Panel No. 11, 11-A, 12-19,with Some supplementary references cited in the Reports,and the Petition for adoption of transmission standardsfor color television before the Federal Communications Commission](1953)

Rgb To Munsell Converter Weight Calculator

Rheinboldt, Werner C. and John P. Menard.Mechanized Conversion of Colorimetric Data to Munsell Renotations.Journal of the Optical Society of America.Vol. 50, Issue 8, pp. 802-807.August 1960.

Wikipedia.Cubic Hermite spline.https://en.wikipedia.org/wiki/Cubic_Hermite_spline

Rgb To Munsell Converter Weight

Paul Centore 2014The Munsell and Kubelka-Munk Toolboxhttp://centore.isletech.net/~centore/MunsellAndKubelkaMunkToolbox/MunsellAndKubelkaMunkToolbox.html

See Also

Examples

Example output

Source: R/munsell2rgb.R

Convert sRGB color coordinates to the closest n Munsell chips in the munsell lookup table.

Arguments

color

a data.frame or matrix object containing sRGB coordinates in the range of (0,1)

colorSpace

distance metric (colorspace) to use for finding the closest chip: CIE2000 is the most accurate but requires farver >= 2.0.3, Euclidean distance in CIELAB is a close second, while Euclidean distance in sRGB is not at all accurate and should only be used for demonstration purposes.

nClosest

number of closest Munsell colors to return (valid range is 1-20)

Value

an (NA-padded) data.frame containing hue, value, chroma, and distance (dE00 when colorSpace = 'CIE2000', Euclidean distance otherwise) to nearest matching color.

Note

This function is fully vectorized and will pad output with NA-records when NA are present in color.

Munsell

References

Munsell To Ral Color Conversion

Author

D.E. Beaudette

Examples

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