trichromacy

Normal (three-cone) color vision — and anomalous trichromacy. A normal trichromat sees true color; anomalous trichromacy (protanomaly / deuteranomaly / tritanomaly) is a milder, shifted deficiency, modeled as a partial simulation.

npm install trichromacy

const trichromacy = require("trichromacy");
trichromacy.simulate("#d7191c");                 // "#d7191c" — true color
trichromacy.anomalous("#d7191c", "deutan", 0.5); // mild deuteranomaly
const png = trichromacy.anomalousImage("./chart.png", "deutan", { severity: 0.5 });

• simulate(color) → the color unchanged (normal trichromatic vision).
• anomalous(color, type, severity=0.5) → a color under anomalous trichromacy; severity 0..1 (0 = normal, 1 = full dichromacy).
• anomalousImage(input, type, opts?) → a recolored PNG Buffer; opts.severity default 0.5.

Built on cvdsim. For full dichromacies see dichromacy; for total color blindness see achromatopsia. A simulation, not a diagnosis.

Licence

MIT.