# nealmckee/penumbra

Penumbra Color Theme

Repository: https://github.com/nealmckee/penumbra
Canonical: https://ross.abutalabs.com/products/penumbra
Language: Julia
License: MIT
License Family: permissive
Last push: 2022-09-13T06:47:06+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 1875, "days_push": 1450, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1422, forks 32 (observed 2026-08-28T04:04:41.128928+00:00)

## What it is
Penumbra is a mathematically balanced color scheme built in a perceptually uniform color space, providing light and dark themes plus high-contrast variants. It ships color values as TSV data and swatches, with accent palettes suitable for encoding quantitative information in data visualizations.

## Use cases
- find a color theme for my code editor
- get a perceptually uniform color palette for data visualization
- need a dark and light theme with balanced contrast
- colors for a chart with accessible contrast levels
- high contrast theme for visual impairment
- export color values as rgb hex and hsl

## When to choose
- you want a scientifically designed theme with controlled luminance, chroma, and hue
- you need accent palettes for encoding quantitative data
- you need enhanced-contrast variants for mild visual impairments

## When to avoid
- you need a theme for a specific editor distributed as a plugin rather than raw color values
- you require WCAG color-vision-deficiency-safe palettes, which this scheme is explicitly unsuitable for

## Facets
- artifact type: dataset
- maturity: maintenance
- function: theme, data-visualization, accessibility
- domain: web-design, data-visualization, accessibility
- platform: cross-platform
- tags: color-scheme, editor-theme, oklab, perceptually-uniform, julia, dark-theme, light-theme

## Member repositories
- nealmckee/penumbra (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:41.128928+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:37:42.592593+00:00, confidence not recorded.
  - readme: https://github.com/nealmckee/penumbra (fetched 2026-08-28T04:04:41.128928+00:00, sha 6ddb39d3ecaa)
- Data as of 2026-08-30T08:39:29.467469+00:00.