Calculates rgb values from spectra based on human colour matching functions.

spec2rgb(rspecdata, alpha = 1)

Arguments

rspecdata

(required) a data frame, possibly of class rspec, which contains a column containing a wavelength range, named 'wl', and spectra data in remaining columns.

alpha

alpha value to use for colours (defaults to 1, opaque).

Value

A character vector consisting of hexadecimal colour values for passing to further plotting functions.

References

CIE(1932). Commission Internationale de l'Eclairage Proceedings, 1931. Cambridge: Cambridge University Press.

Examples

data(teal) spec2rgb(teal)
#> Acrecca-1 Acrecca-2 Acrecca-3 Acrecca-4 Acrecca-5 Acrecca-6 #> "#24B461FF" "#00A65FFF" "#00945EFF" "#00825CFF" "#006E5CFF" "#00585AFF" #> Acrecca-7 Acrecca-8 Acrecca-9 Acrecca-10 Acrecca-11 Acrecca-12 #> "#084756FF" "#1A364EFF" "#222A44FF" "#24223AFF" "#2B2439FF" "#292230FF"
# Plot data using estimated perceived colour plot(teal, col = spec2rgb(teal), type = "overlay")