Royal Blue
#4169e1
A blue that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#4169e1
RGB
65, 105, 225
OKLCh
56.0% 0.188 266.4°
CIELAB (D50)
46.8, 17.8, -66.7
What is true of this colour, and of no other
- 3 other named colours sit within ΔE00 2 of it.
- It uses 78% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 73.2; on black, Lc -28.5. 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 6.9 and 6.8 and 7.7 — no red cone.
Text on this colour
White text
4.85:1 — passes AA
Black text
4.33:1 — large text only
White text is the better of the two at4.85:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#4169e1
protanopia
#6565e1 · ΔE00 6.9
deuteranopia
#5f5fe1 · ΔE00 6.8
tritanopia
#5858ff · ΔE00 7.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isBluetiful at ΔE00 0.701: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- BluetifulΔE00 0.701 · #3c69e7
- The Rainbow FishΔE00 1.832 · #4466ee
- Han BlueΔE00 1.832 · #446ccf
- Secret of ManaΔE00 2.191 · #4166f5
- God of RainΔE00 2.478 · #4466cc
- Retro BlueΔE00 2.587 · #2b62f4
- Gentian FlowerΔE00 2.677 · #3366ff
- CornflowerΔE00 2.76 · #5170d7
- BluerocraticΔE00 2.907 · #1f66ff
- Heroic BlueΔE00 3.192 · #1166ff
- Blue TitmouseΔE00 3.317 · #4466ff
- Bright BlueΔE00 3.371 · #0165fc
8 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.