HueComb

First Blood

#ed1c24

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

#ed1c24

RGB

237, 28, 36

OKLCh

60.3% 0.235 27.0°

CIELAB (D50)

51.6, 74.0, 53.8

What is true of this colour, and of no other

  • 13 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
  • It uses 96% of the chroma sRGB can show at this lightness and hue — close enough to the boundary that a wider display would show it slightly more vividly.
  • As text on white it measures APCA Lc 68.0; on black, Lc -33.6. 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 42.3 and 47.5 and 51.9 — no red cone.

Text on this colour

White text

4.38:1 — large text only

Black text

4.79:1 — passes AA

Black text is the better of the two at4.79:1. That is enough for body text.

As text on white, it needs to change

#eb1722 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

#ed1c24

protanopia

#5b5b28 · ΔE00 42.3

deuteranopia

#8a8a00 · ΔE00 47.5

tritanopia

#aeae00 · ΔE00 51.9

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isIrritated Ibis at ΔE00 0.473: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

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