# Blues

Canonical URL: https://colorcurio.us/colormaps/colorbrewer.Blues
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, single-hue, blue, single-hue, light-start
Stops: 256

## Summary

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

ColorBrewer 2.0 single-hue sequential 'Blues' (9-class anchors).

## Perceptual profile (OKLCh)

- Lightness: 0.986 → 0.322 (range 0.664, min 0.322, max 0.986); monotonic; midpoint 0.723
- Chroma: min 0.007, max 0.138, mean 0.080
- Hue: 247.9° → 259.1° (span 27.9°), path monotonic-cw; quadrants: blue, azure
- Endpoint temperature: cool → cool
- Perceptual ΔE: total 72.8, mean/step 0.286, max step 0.393, smoothness 0.720, speed 0.286

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 66.2; preserves order: yes
- Deuteranopia: ΔE total 69.3; preserves order: yes
- Tritanopia: ΔE total 71.8; preserves order: yes

## Related

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