Galactic Highway
#3311bb
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
#3311bb
RGB
51, 17, 187
OKLCh
38.8% 0.231 275.9°
CIELAB (D50)
24.2, 51.7, -81.9
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses 95% of the chroma sRGB can show at this lightness and hue — close enough to the boundary that a wider display would show it slightly more vividly.
- As text on white it measures APCA Lc 93.1; on black, Lc -9.3. 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
10.83:1 — passes AA
Black text
1.94:1 — fails AA
White text is the better of the two at10.83:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#3311bb
protanopia
#1717bb · ΔE00 2.6
deuteranopia
#1f1fbb · ΔE00 3.1
tritanopia
#2626ac · ΔE00 4.3
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isIndigo Blue at ΔE00 1.533: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Indigo BlueΔE00 1.533 · #3a18b1
- Interdimensional BlueΔE00 1.999 · #360ccc
- Busty BlueΔE00 2.013 · #3300cc
- Deep Daijin BlueΔE00 2.145 · #3311aa
- Evil EyeΔE00 2.808 · #1100cc
- Deep Sea ExplorationΔE00 2.963 · #2000b1
- Sea GrapeΔE00 3.107 · #3300aa
- Lady of the SeaΔE00 3.158 · #0000cc
- Too Dark TonightΔE00 3.171 · #0011bb
- Medium BlueΔE00 3.183 · #0000cd
- True BlueΔE00 3.194 · #010fcc
- VesperΔE00 3.28 · #0011cc
9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.