rgb2munsell | R Documentation |
Convert sRGB color coordinates to the closest n
Munsell chips in the munsell
lookup table. This function will be replaced by col2Munsell()
in aqp 2.1.
rgb2munsell(color, colorSpace = c("CIE2000", "LAB", "sRGB"), nClosest = 1)
color |
a |
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) |
an (NA-padded) data.frame
containing hue
, value
, chroma
, and distance (dE00 when colorSpace = 'CIE2000'
, Euclidean distance otherwise) to nearest matching color.
This function is fully vectorized and will pad output with NA-records when NA are present in color
.
D.E. Beaudette
http://ncss-tech.github.io/AQP/ http://www.brucelindbloom.com/index.html?ColorCalcHelp.html https://www.munsellcolourscienceforpainters.com/MunsellAndKubelkaMunkToolbox/MunsellAndKubelkaMunkToolbox.html http://www.cis.rit.edu/mcsl/online/munsell.php
# keep examples from using more than 2 cores
data.table::setDTthreads(Sys.getenv("OMP_THREAD_LIMIT", unset = 2))
# Munsell notation to sRGB triplets [0-1]
color <- munsell2rgb(
the_hue = c('10YR', '2.5YR', '5YR'),
the_value = c(3, 5, 2.5),
the_chroma = c(5, 6, 2),
return_triplets = TRUE
)
# result is a data.frame
color
# back-transform sRGB -> closest Munsell color
# sigma is the dE00 color contrast metric
rgb2munsell(color)
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