HCL (and HSV) Color Palettes Corresponding to Base R Palettes
Color palettes based on the HCL (and HSV) color space to replace base R palettes.
rainbow_hcl( n, c = 50, l = 70, start = 0, end = 360 * (n - 1)/n, gamma = NULL, fixup = TRUE, alpha = 1, ... ) heat_hcl( n, h = c(0, 90), c. = c(100, 30), l = c(50, 90), power = c(1/5, 1), gamma = NULL, fixup = TRUE, alpha = 1, ... ) terrain_hcl( n, h = c(130, 0), c. = c(80, 0), l = c(60, 95), power = c(1/10, 1), gamma = NULL, fixup = TRUE, alpha = 1, ... ) diverging_hsv( n, h = c(240, 0), s = 1, v = 1, power = 1, gamma = NULL, fixup = TRUE, alpha = 1, ... )
n |
the number of colors (>= 1) to be in the palette. |
c, c. |
chroma value in the HCL color description. |
l |
luminance value in the HCL color description. |
start |
the hue at which the rainbow begins. |
end |
the hue at which the rainbow ends. |
gamma |
Deprecated. |
fixup |
logical. Should the color be corrected to a valid RGB value before correction? |
alpha |
numeric vector of values in the range |
... |
Other arguments passed to |
h |
hue value in the HCL or HSV color description, has to be in [0, 360] for HCL and in [0, 1] for HSV colors. |
power |
control parameter determining how chroma and luminance should be increased (1 = linear, 2 = quadratic, etc.). |
s |
saturation value in the HSV color description. |
v |
value value in the HSV color description. |
Based on the general qualitative, sequential, and diverging hcl_palettes
within the colorspace package, convenience functions are provided as
alternatives to standard base R palettes (which are highly saturated
and too flashy).
rainbow_hcl computes a rainbow of colors via qualitative_hcl
defined by different hues given a single value of each chroma and luminance.
It corresponds to rainbow which computes a rainbow in HSV
space.
heat_hcl is an implementation of heat.colors in
HCL space based on a call to sequential_hcl. Similarly,
terrain_hcl palette also calls sequential_hcl with different
parameters, providing colors similar in spirit to terrain.colors
in HCL space.
diverging_hsv (and equivalently its alias diverge_hsv)
provides an HSV-based version of diverging_hcl. Its purpose
is mainly didactic to show that HSV-based diverging palettes are less
appealing, more difficult to read and more flashy than HCL-based diverging
palettes. diverging_hsv is similar to cm.colors.
A character vector with (s)RGB codings of the colors in the palette.
Zeileis A, Hornik K, Murrell P (2009). Escaping RGBland: Selecting Colors for Statistical Graphics. Computational Statistics & Data Analysis, 53, 3259–3270. doi: 10.1016/j.csda.2008.11.033 Preprint available from https://www.zeileis.org/papers/Zeileis+Hornik+Murrell-2009.pdf.
Stauffer R, Mayr GJ, Dabernig M, Zeileis A (2015). Somewhere over the Rainbow: How to Make Effective Use of Colors in Meteorological Visualizations. Bulletin of the American Meteorological Society, 96(2), 203–216. doi: 10.1175/BAMS-D-13-00155.1
## convenience demo function wheel <- function(col, radius = 1, ...) pie(rep(1, length(col)), col = col, radius = radius, ...) ## compare base and colorspace palettes ## (in color and desaturated) par(mar = rep(0, 4), mfrow = c(2, 2)) ## rainbow color wheel wheel(rainbow_hcl(12)) wheel(rainbow(12)) wheel(desaturate(rainbow_hcl(12))) wheel(desaturate(rainbow(12))) ## diverging red-blue colors swatchplot( diverging_hsv(7), desaturate(diverging_hsv(7)), diverging_hcl(7, c = 100, l = c(50, 90)), desaturate(diverging_hcl(7, c = 100, l = c(50, 90))), nrow = 2 ) ## diverging cyan-magenta colors swatchplot( cm.colors(7), desaturate(cm.colors(7)), diverging_hcl(7, "Cyan-Magenta"), ## or, similarly: Tropic desaturate(diverging_hcl(7, "Cyan-Magenta")), nrow = 2 ) ## heat colors swatchplot( heat.colors(12), desaturate(heat.colors(12)), heat_hcl(12), desaturate(heat_hcl(12)), nrow = 2 ) ## terrain colors swatchplot( terrain.colors(12), desaturate(terrain.colors(12)), terrain_hcl(12), desaturate(terrain_hcl(12)), nrow = 2 )
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.