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Simulate full achromatopsia (complete grayscale) and achromatomaly severity blends. Compare HSP (perceptual) vs Rec.709 luminance, tune severity and inspect ΔE & chromaticity shift toward the achromatic point (D65).

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Base color
Model & settings
Achromatomaly severity100%
Image simulation
Upload JPG/PNG (max 1200×1200). Simulated canvas next to original.
Research notes
Achromatomaly lets you blend between full color and full achromatopsia for research. HSP produces perceptually plausible brightness while Rec.709 follows luminance standards. Preserve contrast applies a light local stretch to keep tonal separation in grayscale.
Swatches — Reference vs Achromatomaly
Reference
HEX: — • RGB: — • xy: —
Achromatomaly
HEX: — • RGB: — • xy: —
ΔE (CIE76)
—
ΔE (CIEDE2000)
—
Deep preview
Reference
Simulated
Chromaticity (CIE xy)
Achromatic axis (to D65)
D65 white point: 0.313, 0.329
Image simulation

Simulations operate in linear sRGB for better perceptual correctness. ΔE2000 implemented locally. Use the severity slider to blend from normal (0%) to full achromatopsia (100%).

Multi-condition comparison
5
Compare normal, Condition A and Condition B across multiple severities. If an image is loaded it will be processed into the grid, otherwise color swatches are shown.