CET Perceptually Uniform Color Maps

Extract n RGB Hexadecimal colors from the perceptually uniform color maps developed by Peter Kovesi.

Usage

cet_pal(n, name = "rainbow", alpha = 1)

Arguments

n

A numeric value greater than one indicating how many colors to use from the color map.

name

A string indicating the color map to use. There are 51 options available. Please see cet_color_maps() for more information. By default, the "rainbow" color scheme is used.

alpha

A numeric value between \([0, 1]\) that indicates the level of transparency.

Value

A character vector containing the RGB hexadecimal representation of the requested color map.

References

Peter Kovesi. Good Colour Maps: How to Design Them. arXiv:1509.03700 cs.GR 2015

Examples

# Grab 8 colors from rainbow or rainbow_bgyr_35-85_c73_n256
colors = cet_pal(8)
plot(1:8, 1:8, col=colors, pch=19, cex=3, xlab="", ylab="")


# Grab 25 colors from coolwarm or diverging_bwr_40-95_c42_n256
colors = cet_pal(25, name = "coolwarm")
plot(1:25, 1:25, col=colors, pch=19, cex=3, xlab="", ylab="")