HueComb

Bluerocratic

#1f66ff

A blue 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

#1f66ff

RGB

31, 102, 255

OKLCh

56.7% 0.238 262.7°

CIELAB (D50)

46.8, 25.3, -83.4

What is true of this colour, and of no other

  • 5 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 72.2; on black, Lc -29.5. 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 7.9 and 8.2 and 9.6 — no red cone.

Text on this colour

White text

4.77:1 — passes AA

Black text

4.40:1 — large text only

White text is the better of the two at4.77:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#1f66ff

protanopia

#6161ff · ΔE00 7.9

deuteranopia

#5858ff · ΔE00 8.2

tritanopia

#4d4dff · ΔE00 9.6

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isHeroic Blue at ΔE00 0.615: 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.