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Compare grayscale strategies: linear-light luminance, Rec.709, Lab L-channel, HSL lightness, and desaturation blend. Includes severity, deep multi-pass, ΔE, and image simulation.

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Base color
Grayscale mode
Severity 100%
Image simulation
JPG/PNG (max 1200×1200). Simulated canvas next to original.
Swatches — Reference vs Grayscale
Reference
HEX: — • RGB: —
Grayscale
HEX: — • RGB: —
ΔE76
—
ΔE2000
—
Deep preview
Reference
Grayscale
Chromaticity (CIE xy)
Coordinates
Reference xy: —
Grayscale xy: —
Image simulation

Modes operate in sRGB. Linear-light luminance linearizes before weighting; Rec.709 applies sRGB coefficients directly; Lab maps to the L-channel and back; HSL uses the lightness midpoint; Desat blends toward gray. Not a clinical tool.

Channel weights