HueComb

Hotter Than Hell

#ff4455

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

#ff4455

RGB

255, 68, 85

OKLCh

66.6% 0.222 21.0°

CIELAB (D50)

58.9, 70.9, 35.6

What is true of this colour, and of no other

  • 3 other named colours sit within ΔE00 2 of it.
  • 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 59.8; on black, Lc -41.9. 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 38.3 and 46.8 and 55.8 — no red cone.

Text on this colour

White text

3.38:1 — large text only

Black text

6.21:1 — passes AA

Black text is the better of the two at6.21:1. That is enough for body text.

As text on white, it needs to change

#e52540 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

#ff4455

protanopia

#717157 · ΔE00 38.3

deuteranopia

#9c9c4b · ΔE00 46.8

tritanopia

#bfbf00 · ΔE00 55.8

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isWatermelon at ΔE00 1.003: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. 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.