aqp (version 1.40)

rgb2munsell: sRGB to Munsell Color Conversion

Description

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

Usage

rgb2munsell(color, colorSpace = c("CIE2000", "LAB", "sRGB"), nClosest = 1)

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.

References

http://ncss-tech.github.io/AQP/ http://www.brucelindbloom.com/index.html?ColorCalcHelp.html http://www.cis.rit.edu/mcsl/online/munsell.php https://www.munsellcolourscienceforpainters.com/MunsellAndKubelkaMunkToolbox/MunsellAndKubelkaMunkToolbox.html

Examples

# NOT RUN {
# Munsell notation to sRGB triplets [0-1] 
color <- munsell2rgb(
  the_hue = c('10YR', '2.5YR'), 
  the_value = c(3, 5), 
  the_chroma = c(5, 6), 
  return_triplets = TRUE
)

# result is a data.frame
color

# sRGB triplets to closest Munsell color 
# dE00 distandce metric
# result is a data.frame
rgb2munsell(color)

# }