# RdBu

Canonical URL: https://colorcurio.us/colormaps/colorbrewer.RdBu
Source type: Colormap
Type: diverging
Collection: colorbrewer
Attribution: Cynthia Brewer & Mark Harrower, ColorBrewer 2.0
License: Apache-2.0
Source: https://colorbrewer2.org/
Tags: diverging, colorbrewer, red-blue
Stops: 256

## Summary

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

ColorBrewer 2.0 diverging 'RdBu' (11-class anchors).

## Perceptual profile (OKLCh)

- Lightness: 0.327 → 0.313 (range 0.662, min 0.313, max 0.975); non-monotonic; midpoint 0.975
- Chroma: min 0.001, max 0.184, mean 0.093
- Hue: 14.2° → 255.5° (span 241.3°), path monotonic-cw; quadrants: red, orange, azure, blue
- Endpoint temperature: warm → cool
- Perceptual ΔE: total 155.3, mean/step 0.609, max step 0.822, smoothness 0.810, speed 0.609

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 144.7; preserves order: yes
- Deuteranopia: ΔE total 143.4; preserves order: yes
- Tritanopia: ΔE total 157.9; preserves order: yes

## Related

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