HFV-branded continuous color scale — scale_color_hfv

A sequential or diverging colorspace HCL ramp, tuned and CVD-checked against protanopia, deuteranopia, and tritanopia in the Ramp Lab review (plans/ramp-lab/REVIEW.md).

Usage

scale_color_hfv_c(
  palette = c("sequential", "diverging"),
  direction = 1,
  na.value = .brands$hfv$na_color,
  guide = "colorbar",
  ...
)

scale_colour_hfv_c(
  palette = c("sequential", "diverging"),
  direction = 1,
  na.value = .brands$hfv$na_color,
  guide = "colorbar",
  ...
)

Arguments

palette: One of "sequential" (default) or "diverging"
direction: For palette = "sequential", 1 (default) maps higher values to darker colors; -1 reverses so higher values are lighter. For palette = "diverging", 1 (default) maps low values toward the first arm and high values toward the second, as constructed in the Ramp Lab review; -1 swaps which arm represents low vs. high.
na.value: Default color for NA values (#d6dadd, HFV Light Gray)
guide: Legend representation for scale
...: Other arguments passed on to ggplot2::continuous_scale()

Value

A ggplot2::continuous_scale() object.

Diverging palette usage

7-class diverging maps built from these ramps lose sign distinction in their innermost class pair under protanopia (structural to the shared cream center) — always pair a palette = "diverging" map with a legend or direct labels. See plans/DECISIONS.md (2026-07-18).

Examples

library(ggplot2)
ggplot(mtcars, aes(wt, mpg, color = disp)) +
  geom_point() +
  scale_color_hfv_c()