# Roma

Canonical URL: https://colorcurio.us/colormaps/crameri.roma
Source type: Colormap
Type: diverging
Collection: crameri
Attribution: Crameri 2018, Scientific Colour Maps (https://www.fabiocrameri.ch/colourmaps/)
License: CC-BY-4.0
Source: https://www.fabiocrameri.ch/colourmaps/
Tags: scientific, perceptually-uniform, red-blue
Stops: 256

## Summary

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

Diverging rainbow alternative. Sourced from ScientificColourMaps8/roma/roma.txt.

## Perceptual profile (OKLCh)

- Lightness: 0.385 → 0.367 (range 0.532, min 0.367, max 0.898); non-monotonic; midpoint 0.898
- Chroma: min 0.068, max 0.174, mean 0.111
- Hue: 33.5° → 262.7° (span 229.3°), path monotonic-cw; quadrants: orange, yellow, chartreuse, green, mint, cyan, azure, blue
- Endpoint temperature: warm → cool
- Perceptual ΔE: total 155.3, mean/step 0.609, max step 0.623, smoothness 0.989, speed 0.609

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 136.9; preserves order: yes
- Deuteranopia: ΔE total 132.0; preserves order: yes
- Tritanopia: ΔE total 141.0; preserves order: yes

## Related

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