# Blues (perceptual)

Canonical URL: https://colorcurio.us/colormaps/colorcet.blues
Source type: Colormap
Type: sequential
Collection: colorcet
Attribution: Kovesi 2015 — "Good Colour Maps: How to Design Them" (arXiv:1509.03700)
License: CC-BY-4.0
Source: https://raw.githubusercontent.com/holoviz/colorcet/main/assets/CET/linear_blue_95-50_c20_n256.csv
Tags: perceptually-uniform, bathymetry, cartographic, single-hue
Stops: 256

## Summary

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

## Perceptual profile (OKLCh)

- Lightness: 0.957 → 0.567 (range 0.390, min 0.567, max 0.957); monotonic; midpoint 0.763
- Chroma: min 0.000, max 0.107, mean 0.059
- Hue: 179.0° → 246.5° (span 78.0°), path monotonic-cw; quadrants: blue
- Endpoint temperature: null → cool
- Perceptual ΔE: total 43.1, mean/step 0.169, max step 0.258, smoothness 0.830, speed 0.169

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 40.3; preserves order: yes
- Deuteranopia: ΔE total 45.1; preserves order: yes
- Tritanopia: ΔE total 44.1; preserves order: yes

## Related

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