Warm Blue
#4b57db
A blue that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#4b57db
RGB
75, 87, 219
OKLCh
52.7% 0.199 273.4°
CIELAB (D50)
42.3, 28.4, -70.5
What is true of this colour, and of no other
- One other named colour sits within ΔE00 2 of it.
- It uses 75% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 78.0; on black, Lc -23.8. 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
5.70:1 — passes AA
Black text
3.69:1 — large text only
White text is the better of the two at5.70:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#4b57db
protanopia
#5656db · ΔE00 2.0
deuteranopia
#5454db · ΔE00 2.0
tritanopia
#5151e5 · ΔE00 2.4
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isDark Soft Violet at ΔE00 1.662: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Dark Soft VioletΔE00 1.662 · #4d52de
- Qing Dynasty DragonΔE00 2.07 · #4455ee
- Gorgonzola BlueΔE00 2.191 · #4455cc
- Aquarius Mood IndigoΔE00 3.009 · #4d5af3
- Arcane BrewΔE00 3.011 · #5260e1
- Free Speech BlueΔE00 3.11 · #4156c5
- Savoy BlueΔE00 3.34 · #4b61d1
- MonarchistΔE00 3.642 · #4b62d2
- Veteran’s Day BlueΔE00 3.693 · #2e58e8
- Hooloovoo BlueΔE00 3.736 · #4455ff
- Saturated SkyΔE00 4.3 · #4b4cfc
- Sylph of MoonlightΔE00 4.326 · #524efb
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.