Preview the depictr palettes

Displays the colours returned by depictr_palette() as labelled swatches. It is useful when choosing how many groups to show, selecting a palette type, or documenting a figure. Each swatch's hex label is drawn in near-black or white, whichever is more legible against that tile (chosen by the tile's relative luminance), so labels stay readable on both light and dark colours.

Usage

palette_preview(
  n = 8,
  type = c("qualitative", "sequential", "diverging", "all"),
  cvd = c("none", "deutan", "protan", "tritan")
)

Arguments

n

Number of colours to preview.

type

Palette type to preview: "qualitative", "sequential", "diverging", or "all" to show all three.

cvd

Colour-vision-deficiency simulation for the tiles: "none" (the default, true colours), "deutan" (red-green, deuteranopia), "protan" (red-green, protanopia) or "tritan" (blue-yellow, tritanopia).

Value

A ggplot2::ggplot object.

Details

Set cvd to render the swatches as they would appear under a colour-vision deficiency, using the Machado et al. (2009) simulation. The tiles are recoloured to the simulated appearance while the labels keep the original hex code, so you can check at a glance whether two groups would still be told apart by a colourblind reader.

References

Machado GM, Oliveira MM, Fernandes LAF (2009). “A physiologically-based model for simulation of color vision deficiency.” IEEE Transactions on Visualization and Computer Graphics, 15(6), 1291–1298. doi:10.1109/TVCG.2009.113 .

Examples

palette_preview()

palette_preview(7, type = "sequential")

palette_preview(type = "all")

palette_preview(cvd = "deutan")