HueComb

Alarm

#ec0003

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

#ec0003

RGB

236, 0, 3

OKLCh

59.2% 0.243 29.0°

CIELAB (D50)

50.3, 76.2, 65.0

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 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 68.9; on black, Lc -32.8. 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 43.4 and 45.8 and 50.4 — no red cone.

Text on this colour

White text

4.60:1 — passes AA

Black text

4.57:1 — passes AA

White text is the better of the two at4.60:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#ec0003

protanopia

#57570e · ΔE00 43.4

deuteranopia

#888800 · ΔE00 45.8

tritanopia

#acac00 · ΔE00 50.4

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isMVS Red at ΔE00 0.571: 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.