Daltonization

Fidaner error-redistribution: the information lost to a dichromat is shifted into channels they can still see. If you're building a "color blind mode", these are the colors you'd put on screen.

swatch("#ff0000").daltonize("deutan");
swatch("#ff0000").daltonize("protan", { severity: 0.8 });

The corrected color may look shifted to a trichromat — that's expected. What matters is that a CVD viewer can now distinguish it from its neighbors.

Verify the fix by running the daltonized color back through simulation:

const red       = swatch("#ff0000");
const corrected = red.daltonize("deutan");
corrected.simulate("deutan");   // should be more distinct than red.simulate("deutan")

The §03 panel of the playground shows all three steps side-by-side: Original (sim) → Daltonized → Daltonized (sim).