perceive-cvd

Colorblind (color vision deficiency) simulation using Brettel and Viénot models — in Rust.

Part of the Perceive accessibility platform. Live demo — drag an image in and see it through different types of color vision deficiency.

Features

Brettel et al. (1997) — accurate two-half-plane simulation with configurable severity
Viénot et al. (1999) — fast single-matrix simulation for real-time use
All CVD types — protanopia, deuteranopia, tritanopia, achromatopsia
Severity control — simulate partial color vision deficiency (0.0–1.0)
#![no_std] compatible
WASM ready — powers CVD preview in @perceive/color

Quick Start

use perceive_color::Color;
use perceive_cvd::{simulate, simulate_fast, CvdType, Severity};

let red = Color::from_hex("#ff0000").unwrap();

// Accurate simulation with severity
let protan_50 = simulate(red, CvdType::Protan, Severity::new(0.5));

// Full dichromacy (fast path)
let deutan_full = simulate_fast(red, CvdType::Deutan);

// Simulate all types for a color palette review
for cvd in [CvdType::Protan, CvdType::Deutan, CvdType::Tritan] {
    let sim = simulate(red, cvd, Severity::FULL);
    println!("{cvd:?}: {}", sim.to_hex());
}

Models

Model	Function	Accuracy	Speed	Severity
Brettel 1997	`simulate()`	High (two half-planes)	Normal	0.0–1.0
Viénot 1999	`simulate_fast()`	Good (single matrix)	Fast	Full only

CVD Types

Type	Affected Cones	Prevalence
Protan	L-cones (red)	~1.3% of males
Deutan	M-cones (green)	~5.0% of males
Tritan	S-cones (blue)	~0.01%
Achromat	All	~0.003%

License