Color Blindness Simulator

How it works

Each color-blindness type is a fixed 3×3 matrix applied directly to the color's red, green and blue channels (0-255) — every output channel is a weighted mix of the input channels, then clamped back to 0-255 and rounded. This is the standard simplified approach most on-screen simulators use, not a physically exact model of any one person's vision — real color vision deficiency varies in severity from person to person, so treat this as a useful approximation rather than a diagnosis.

Protanopia and deuteranopia are red-green deficiencies — reds, greens, browns and oranges become harder to tell apart. Tritanopia is a much rarer blue-yellow deficiency — blues and yellows are the pair that gets confused instead.