safepalette

Colorblind-safe color palettes — generate, check, and fix. Ask for N safe colors, test a palette you have, or repair one that fails — protanopia, deuteranopia, tritanopia.

pip install safepalette

import safepalette as sp

sp.generate(5)                          # 5 colorblind-safe hex colors (Okabe-Ito based)
sp.is_safe(["#d7191c", "#1a9641"])      # False — red & green collapse under deutan/protan
sp.fix(["#d7191c", "#1a9641"])["colors"] # a safe palette near the originals
sp.OKABE_ITO                            # the canonical 8-color safe palette

API

• generate(n, **opts) → up to n colorblind-safe hex colors. n <= 8 is the Okabe–Ito palette (safe by design); above 8 it extends only with colors that keep the whole set passing. Large n may return fewer than n — never an unsafe color.
• is_safe(colors, **opts) → True/False.
• fix(colors, **opts) → {"colors", "drift", "pass", "residual"}, a safe palette near the originals.
• check(colors, **opts) → the full per-type conflict report.

How it decides

check and fix are opticquiz-cvd's check_palette and fix_palette — Machado, Oliveira & Fernandes (2009) + CIEDE2000, open access: https://doi.org/10.5281/zenodo.21310578 . The generator is seeded with the Okabe–Ito safe palette (Wong, Nature Methods, 2011). No colorimetry is reimplemented here.

Not a legal audit

A screening/design aid for the color-distinguishability axis, not a WCAG/ADA audit.

Licence

MIT.