Cone Knockout

Toggle S, M, L cones on/off to simulate dichromacy and monochromacy. See how the perceived spectrum collapses.

Active cones
S-cone 437 nm
M-cone 533 nm
L-cone 564 nm
Normal trichromat
Spectrum view
Physical
spectrum
550 nm
As
perceived
550 nm
With all three cones active, each wavelength produces a unique pattern of S, M, L responses — the full rainbow is visible.
Wavelength probe — click the spectrum above to select
S
M
L
Normal trichromat
Perceived (active cones)