# Bluered

Canonical URL: https://colorcurio.us/colormaps/plotly.bluered
Source type: Colormap
Type: diverging
Collection: plotly
Attribution: plotly.js / plotly.py contributors
License: MIT
Source: https://github.com/plotly/plotly.py/blob/main/_plotly_utils/colors/plotlyjs.py
Tags: diverging
Stops: 256

## Summary

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

Pure blue↔red 2-stop diverging.

## Perceptual profile (OKLCh)

- Lightness: 0.452 → 0.628 (range 0.235, min 0.393, max 0.628); non-monotonic; midpoint 0.419
- Chroma: min 0.189, max 0.313, mean 0.228
- Hue: 264.1° → 29.2° (span 125.2°), path monotonic-cw; quadrants: blue, violet, magenta, rose, red
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 71.9, mean/step 0.282, max step 0.461, smoothness 0.564, speed 0.282

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 71.9; preserves order: yes
- Deuteranopia: ΔE total 82.2; preserves order: yes
- Tritanopia: ΔE total 88.1; preserves order: yes

## Related

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