HueComb

Red Coral

#ff4040

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

#ff4040

RGB

255, 64, 64

OKLCh

66.0% 0.227 26.0°

CIELAB (D50)

58.3, 71.5, 46.7

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 60.6; on black, Lc -41.1. 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 41.2 and 47.2 and 53.2 — no red cone.

Text on this colour

White text

3.47:1 — large text only

Black text

6.06:1 — passes AA

Black text is the better of the two at6.06:1. That is enough for body text.

As text on white, it needs to change

#e7222b 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

#ff4040

protanopia

#6f6f42 · ΔE00 41.2

deuteranopia

#9b9b30 · ΔE00 47.2

tritanopia

#bfbf00 · ΔE00 53.2

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTomato Frog at ΔE00 0.71: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

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