HueComb

Imperial Red

#ec2938

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

#ec2938

RGB

236, 41, 56

OKLCh

61.0% 0.226 24.1°

CIELAB (D50)

52.4, 71.8, 43.7

What is true of this colour, and of no other

  • 9 other named colours sit within ΔE00 2 of it.
  • It uses 92% 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 67.4; on black, Lc -34.3. 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 40.3 and 47.1 and 53.3 — no red cone.

Text on this colour

White text

4.25:1 — large text only

Black text

4.94:1 — passes AA

Black text is the better of the two at4.94:1. That is enough for body text.

As text on white, it needs to change

#e72134 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

#ec2938

protanopia

#5f5f3a · ΔE00 40.3

deuteranopia

#8c8c28 · ΔE00 47.1

tritanopia

#aeae00 · ΔE00 53.3

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isPoppy Power at ΔE00 0.283: 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.