# GnBu

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

## Summary

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

ColorBrewer 2.0 sequential multi-hue 'GnBu' (9-class anchors).

## Perceptual profile (OKLCh)

- Lightness: 0.984 → 0.379 (range 0.605, min 0.379, max 0.984); monotonic; midpoint 0.792
- Chroma: min 0.017, max 0.133, mean 0.084
- Hue: 125.3° → 256.2° (span 131.0°), path monotonic-cw; quadrants: green, mint, cyan, azure, blue
- Endpoint temperature: neutral → cool
- Perceptual ΔE: total 89.6, mean/step 0.351, max step 0.530, smoothness 0.663, speed 0.351

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 80.2; preserves order: yes
- Deuteranopia: ΔE total 80.2; preserves order: yes
- Tritanopia: ΔE total 71.2; preserves order: yes

## Related

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