HueComb

Rage

#ff1133

A red that is about as vivid as sRGB can show at this lightness. It is light — black text sits on it comfortably, white text does not.

Hex

#ff1133

RGB

255, 17, 51

OKLCh

63.4% 0.252 24.2°

CIELAB (D50)

54.9, 80.1, 50.5

What is true of this colour, and of no other

  • 9 other named colours sit within ΔE00 2 of it.
  • It sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
  • As text on white it measures APCA Lc 63.8; on black, Lc -37.9. The sign is the polarity, which the WCAG ratio discards.
  • Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
  • protanopia and deuteranopia and tritanopia shift it by ΔE00 43.3 and 50.1 and 55.6 — no red cone.

Text on this colour

White text

3.90:1 — large text only

Black text

5.38:1 — passes AA

Black text is the better of the two at5.38:1. That is enough for body text.

As text on white, it needs to change

#ee002c is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved, and some saturation was given up to stay inside sRGB.

Try it against your own background

The same colour, with one cone missing

As you see it

#ff1133

protanopia

#606036 · ΔE00 43.3

deuteranopia

#94941b · ΔE00 50.1

tritanopia

#bbbb00 · ΔE00 55.6

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isHornet Sting at ΔE00 0.615: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

8 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.