HueComb

Bohemian Blue

#0000aa

A blue that is about as vivid as sRGB can show at this lightness. It is dark — it carries white text and needs care with black.

Hex

#0000aa

RGB

0, 0, 170

OKLCh

33.4% 0.231 264.1°

CIELAB (D50)

17.6, 50.4, -82.7

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 96.7; on black, Lc 0.0. 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.
  • All three dichromacies see it as very nearly the same colour you do: its hue is not the part carrying its identity.

Text on this colour

White text

13.29:1 — passes AA

Black text

1.58:1 — fails AA

White text is the better of the two at13.29:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#0000aa

protanopia

#0000aa · ΔE00 0.0

deuteranopia

#0000aa · ΔE00 0.0

tritanopia

#0000aa · ΔE00 0.0

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTraditional Royal Blue at ΔE00 0.476: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.