Visualize Spectral Mixing of Munsell Colors

Source: R/plotColorMixture.R

Lattice visualization demonstrating subtractive mixtures of colors in Munsell notation and associated spectra.

plotColorMixture(
  x,
  w = rep(1, times = length(x))/length(x),
  mixingMethod = c("reference", "exact"),
  n = 1,
  swatch.cex = 6,
  label.cex = 0.85,
  showMixedSpec = FALSE,
  overlapFix = TRUE
)

Arguments

x

vector of colors in Munsell notation, should not contain duplicates

w

vector of weights, can sum to any number

mixingMethod

approach used to simulate a mixture:

  • reference : simulate a subtractive mixture of pigments, selecting n closest reference spectra

  • exact: simulate a subtractive mixture of pigments, color conversion via CIE1931 color-matching functions (see mixMunsell)

n

number of closest mixture candidates when mixingMethod = 'reference' (see mixMunsell), results can be hard to interpret when n > 2

swatch.cex

scaling factor for color swatch

label.cex

scaling factor for swatch labels

showMixedSpec

show weighted geometric mean (mixed) spectra as dotted line (only when mixingMethod = 'reference')

overlapFix

attempt to "fix" overlapping chip labels via fixOverlap

Value

a lattice graphics object

Details

If present, names attribute of x is used for the figure legend.

Author

D.E. Beaudette

Examples


# color chips
chips <- c('5B 5/10', '5Y 8/8')
names(chips) <- chips

# weights
wt <- c(1, 1)

plotColorMixture(
x = chips, 
w = wt, 
swatch.cex = 4, 
label.cex = 0.65, 
showMixedSpec = TRUE, 
mixingMethod = 'reference'
)


plotColorMixture(
  x = chips, 
  w = wt, 
  swatch.cex = 4, 
  label.cex = 0.65, 
  mixingMethod = 'exact'
)