# BRG

Canonical URL: https://colorcurio.us/colormaps/matplotlib.brg
Source type: Colormap
Type: sequential
Collection: matplotlib
Attribution: matplotlib developers
License: matplotlib (BSD-derived)
Source: https://github.com/matplotlib/matplotlib/blob/main/lib/matplotlib/_cm.py
Tags: rainbow
Stops: 256

## Summary

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

Blue→red→green legacy ramp.

## Perceptual profile (OKLCh)

- Lightness: 0.452 → 0.866 (range 0.473, min 0.393, max 0.866); non-monotonic; midpoint 0.626
- Chroma: min 0.114, max 0.313, mean 0.213
- Hue: 264.1° → 142.5° (span 238.4°), path monotonic-cw; quadrants: blue, violet, magenta, rose, red, orange, yellow, chartreuse, green
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 161.9, mean/step 0.635, max step 1.442, smoothness 0.514, speed 0.635

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 121.2; preserves order: no
- Deuteranopia: ΔE total 123.5; preserves order: no
- Tritanopia: ΔE total 187.6; preserves order: no

## Related

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