# Isolum CM 70

Canonical URL: https://colorcurio.us/colormaps/colorcet.isolum-cm70
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/isoluminant_cm_70_c39_n256.csv
Tags: isoluminant, overlay
Stops: 256

## Summary

Isolum CM 70 is a sequential colormap from the colorcet collection. Inspect its perceptual lightness, chroma, and hue profile on colorcurio.us.

## Perceptual profile (OKLCh)

- Lightness: 0.732 → 0.761 (range 0.029, min 0.732, max 0.761); monotonic; midpoint 0.749
- Chroma: min 0.097, max 0.152, mean 0.113
- Hue: 223.4° → 0.3° (span 136.8°), path monotonic-cw; quadrants: azure, blue, violet, magenta, rose, red
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 55.3, mean/step 0.217, max step 0.281, smoothness 0.810, speed 0.217

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 17.8; preserves order: yes
- Deuteranopia: ΔE total 28.3; preserves order: yes
- Tritanopia: ΔE total 63.8; preserves order: no

## Related

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