# BuPu

Canonical URL: https://colorcurio.us/colormaps/colorbrewer.BuPu
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, blue-purple, light-start
Stops: 256

## Summary

BuPu 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 'BuPu' (9-class anchors).

## Perceptual profile (OKLCh)

- Lightness: 0.988 → 0.293 (range 0.694, min 0.293, max 0.988); monotonic; midpoint 0.684
- Chroma: min 0.005, max 0.183, mean 0.086
- Hue: 211.0° → 329.6° (span 119.3°), path monotonic-cw; quadrants: blue, violet, magenta, rose
- Endpoint temperature: cool → cool
- Perceptual ΔE: total 82.2, mean/step 0.323, max step 0.536, smoothness 0.675, speed 0.323

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 74.0; preserves order: yes
- Deuteranopia: ΔE total 69.9; preserves order: yes
- Tritanopia: ΔE total 94.9; preserves order: yes

## Related

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