Noble Knight
#394d78
A blue that is nearly neutral — the hue shows only against a true grey. It is mid — the hardest range to put text on, either colour struggles.
Hex
#394d78
RGB
57, 77, 120
OKLCh
42.4% 0.076 264.4°
CIELAB (D50)
32.6, 2.2, -27.4
What is true of this colour, and of no other
- 4 other named colours sit within ΔE00 2 of it.
- It uses only 26% of the chroma available at this lightness and hue — there is a far more vivid version of this colour inside sRGB.
- As text on white it measures APCA Lc 88.8; on black, Lc -13.4. 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 6.5 and 6.1 and 5.7 — no red cone.
Text on this colour
White text
8.38:1 — passes AA
Black text
2.51:1 — fails AA
White text is the better of the two at8.38:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#394d78
protanopia
#4b4b78 · ΔE00 6.5
deuteranopia
#484878 · ΔE00 6.1
tritanopia
#444492 · ΔE00 5.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTakaka at ΔE00 1.221: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- TakakaΔE00 1.221 · #3d4d78
- Daring IndigoΔE00 1.782 · #374874
- DragonflyΔE00 1.782 · #314a76
- ExpressionismΔE00 1.816 · #39497b
- SailboatΔE00 2.029 · #314a72
- St. TropazΔE00 2.077 · #39527d
- Dive InΔE00 2.095 · #3c4d85
- Midnight InterludeΔE00 2.118 · #32496f
- AirforceΔE00 2.143 · #364d70
- High AltarΔE00 2.205 · #334f7b
- Hydrogen BlueΔE00 2.353 · #33476d
- Jazzy BlueΔE00 2.459 · #3a4c88
9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.