Colorblind-safe palettes (qualitative, sequential, diverging)

Returns n colors from a colour-vision-deficiency-safe palette. The "qualitative" palette is the Okabe & Ito set (distinguishable under deuteranopia / protanopia); "sequential" is viridis; and "diverging" is a CVD-safe blue-red diverging ramp. Shared across all ecosystem visualizations so figures are consistent and accessible.

Usage

physioPalette(n = 8L, type = c("qualitative", "sequential", "diverging"))

Arguments

n

Number of colors to return.

type

Palette family: "qualitative" (default), "sequential" or "diverging".

Value

Character vector of n hex colors. The qualitative palette has only 8 colour-vision-safe entries; requesting n > 8 qualitative colours emits a warning and returns a best-effort interpolation that is no longer reliably distinguishable under colour-vision deficiency (no qualitative palette is). Prefer faceting or a sequential encoding for more than 8 categories.

References

Okabe, M. & Ito, K. (2008). Color Universal Design. Garnier et al. (viridis). Zeileis et al. (2020). colorspace, JSS 96(1).

Examples

physioPalette(4)
#> [1] "#000000" "#E69F00" "#56B4E9" "#009E73"
physioPalette(7, "sequential")
#> [1] "#4B0055" "#353E7C" "#007094" "#009B95" "#00BE7D" "#96D84B" "#FDE333"
physioPalette(5, "diverging")
#> [1] "#002F70" "#879FDB" "#F6F6F6" "#DA8A8B" "#5F1415"