HueComb

Sanguinary

#f01a4d

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

#f01a4d

RGB

240, 26, 77

OKLCh

61.3% 0.236 17.3°

CIELAB (D50)

52.5, 76.0, 31.8

What is true of this colour, and of no other

  • 9 other named colours sit within ΔE00 2 of it.
  • 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 66.9; on black, Lc -34.7. 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 36.6 and 48.1 and 58.1 — no red cone.

Text on this colour

White text

4.23:1 — large text only

Black text

4.96:1 — passes AA

Black text is the better of the two at4.96:1. That is enough for body text.

As text on white, it needs to change

#eb0d49 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

#f01a4d

protanopia

#5c5c4f · ΔE00 36.6

deuteranopia

#8c8c42 · ΔE00 48.1

tritanopia

#b0b000 · ΔE00 58.1

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isRed Crayon at ΔE00 0.35: 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.