# IsoL

Canonical URL: https://colorcurio.us/colormaps/niccoli.IsoL
Source type: Colormap
Type: sequential
Collection: niccoli
Attribution: Matteo Niccoli — pmkmp.m (MATLAB Central FX 28982)
License: BSD-3 (Niccoli, mycarta)
Source: https://github.com/mycarta/PMKMP/blob/master/pmkmp/pmkmp.m
Tags: isoluminant, rainbow, overlay
Stops: 256

## Summary

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

Lab-based isoluminant rainbow at L*=60; for interval data with external lighting.

## Perceptual profile (OKLCh)

- Lightness: 0.672 → 0.653 (range 0.096, min 0.576, max 0.672); non-monotonic; midpoint 0.603
- Chroma: min 0.100, max 0.271, mean 0.176
- Hue: 328.8° → 29.7° (span 299.1°), path monotonic-ccw; quadrants: magenta, violet, blue, azure, cyan, mint, green, chartreuse, yellow, orange, red
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 164.7, mean/step 0.646, max step 1.335, smoothness 0.486, speed 0.646

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 84.1; preserves order: no
- Deuteranopia: ΔE total 87.6; preserves order: no
- Tritanopia: ΔE total 148.7; preserves order: no

## Related

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