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Compare models (Brettel, Viénot, Machado-like), inspect chromaticity shifts, confusion lines, ΔE (CIE76 & CIEDE2000), and simulate images with tunable severity.

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Base color
Model & settings
Severity 100%
Image simulation
JPG/PNG (max 1200×1200). Simulated canvas next to original.
Research notes
Protanopia is the absence of functional L-cones. Brettel and Viénot implement analytic LMS reductions derived from cone response theory; the Machado-like option blends identity and dichromatic projection to approximate severity ramps. ΔE2000 is included for perceptual accuracy.
Swatches — Reference vs Protanopia
Reference
HEX: — • RGB: — • xy: —
Protanopia
HEX: — • RGB: — • xy: —
ΔE76
—
ΔE2000
—
Deep preview
Reference
Simulated
Chromaticity (CIE xy)
Confusion line
Protan confusion point: —
Image simulation

Models operate in linear sRGB. ΔE2000 is computed locally. Chromaticity visualizes D65 xy shifts and the protan confusion line for explanatory purposes.

Cone channel weights