HueComb

Hotspot

#ff4433

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

#ff4433

RGB

255, 68, 51

OKLCh

66.2% 0.225 29.6°

CIELAB (D50)

58.6, 70.0, 53.8

What is true of this colour, and of no other

  • 2 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 60.3; on black, Lc -41.4. 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 41.8 and 46.3 and 50.8 — no red cone.

Text on this colour

White text

3.43:1 — large text only

Black text

6.13:1 — passes AA

Black text is the better of the two at6.13:1. That is enough for body text.

As text on white, it needs to change

#e62619 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.

Try it against your own background

The same colour, with one cone missing

As you see it

#ff4433

protanopia

#717136 · ΔE00 41.8

deuteranopia

#9c9c1d · ΔE00 46.3

tritanopia

#bfbf00 · ΔE00 50.8

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isRed Orange at ΔE00 0.99: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

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