# BuRd

Canonical URL: https://colorcurio.us/colormaps/tol.BuRd
Source type: Colormap
Type: diverging
Collection: tol
Attribution: Paul Tol, "Colour Schemes" (SRON/EPS/TN/09-002)
License: BSD-3-Clause
Source: https://sronpersonalpages.nl/~pault/
Tags: diverging, cvd-friendly, blue-red
Stops: 256

## Summary

BuRd is a diverging colormap from the tol collection. Inspect its perceptual lightness, chroma, and hue profile on colorcurio.us.

Diverging blue→white→red.

## Perceptual profile (OKLCh)

- Lightness: 0.505 → 0.491 (range 0.484, min 0.491, max 0.975); non-monotonic; midpoint 0.975
- Chroma: min 0.000, max 0.185, mean 0.082
- Hue: 252.4° → 22.4° (span 229.9°), path monotonic-ccw; quadrants: blue, azure, orange, red
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 119.7, mean/step 0.469, max step 0.617, smoothness 0.802, speed 0.469

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 110.1; preserves order: yes
- Deuteranopia: ΔE total 107.7; preserves order: yes
- Tritanopia: ΔE total 122.2; preserves order: yes

## Related

- Family: https://colorcurio.us/colormaps/families/tol
- All colormaps: https://colorcurio.us/colormaps