# PRGn

Canonical URL: https://colorcurio.us/colormaps/tol.PRGn
Source type: Colormap
Type: diverging
Collection: tol
Attribution: Paul Tol, "Colour Schemes" (SRON/EPS/TN/09-002)
License: BSD-3-Clause
Source: https://sronpersonalpages.nl/~pault/
Tags: diverging, cvd-friendly, purple-green
Stops: 256

## Summary

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

Diverging purple→white→green.

## Perceptual profile (OKLCh)

- Lightness: 0.435 → 0.505 (range 0.540, min 0.435, max 0.975); non-monotonic; midpoint 0.975
- Chroma: min 0.001, max 0.156, mean 0.076
- Hue: 321.5° → 148.7° (span 193.5°), path monotonic-cw; quadrants: magenta, green
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 123.9, mean/step 0.486, max step 0.706, smoothness 0.786, speed 0.486

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 111.9; preserves order: yes
- Deuteranopia: ΔE total 107.5; preserves order: yes
- Tritanopia: ΔE total 112.8; preserves order: yes

## Related

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