HueComb

Ottoman Red

#ee2222

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

#ee2222

RGB

238, 34, 34

OKLCh

60.7% 0.233 27.9°

CIELAB (D50)

52.1, 73.3, 55.2

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 94% 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 67.5; on black, Lc -34.1. 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 42.3 and 47.0 and 51.3 — no red cone.

Text on this colour

White text

4.30:1 — large text only

Black text

4.89:1 — passes AA

Black text is the better of the two at4.89:1. That is enough for body text.

As text on white, it needs to change

#ea1b1d 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

#ee2222

protanopia

#5d5d26 · ΔE00 42.3

deuteranopia

#8c8c00 · ΔE00 47.0

tritanopia

#afaf00 · ΔE00 51.3

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isKen Masters Red at ΔE00 0.693: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

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