HueComb

Blood Donor

#ea1822

A red that is about as vivid as sRGB can show at this lightness. It is mid — the hardest range to put text on, either colour struggles.

Hex

#ea1822

RGB

234, 24, 34

OKLCh

59.6% 0.234 27.0°

CIELAB (D50)

50.8, 73.8, 53.8

What is true of this colour, and of no other

  • 15 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 68.9; on black, Lc -32.7. 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 42.2 and 47.2 and 51.8 — no red cone.

Text on this colour

White text

4.51:1 — passes AA

Black text

4.65:1 — passes AA

Black text is the better of the two at4.65:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#ea1822

protanopia

#595926 · ΔE00 42.2

deuteranopia

#888800 · ΔE00 47.2

tritanopia

#acac00 · ΔE00 51.8

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSilken Ruby at ΔE00 0.655: 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.