St. Tropaz
#39527d
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
#39527d
RGB
57, 82, 125
OKLCh
43.9% 0.078 260.8°
CIELAB (D50)
34.4, 0.5, -27.7
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses 42% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 87.1; on black, Lc -15.0. 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.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 8.0 and 7.5 and 6.6 — no red cone.
Text on this colour
White text
7.84:1 — passes AA
Black text
2.68:1 — fails AA
White text is the better of the two at7.84:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#39527d
protanopia
#50507d · ΔE00 8.0
deuteranopia
#4c4c7d · ΔE00 7.5
tritanopia
#47479d · ΔE00 6.6
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isDeep Azure at ΔE00 1.236: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Deep AzureΔE00 1.236 · #3e5580
- High AltarΔE00 1.325 · #334f7b
- Bunting BlueΔE00 1.474 · #35537c
- Fun BlueΔE00 1.597 · #335083
- Blue QuartzΔE00 1.956 · #335287
- Noble KnightΔE00 2.077 · #394d78
- St. TropezΔE00 2.206 · #325482
- Tory BlueΔE00 2.309 · #374e88
- OvertakeΔE00 2.45 · #33557f
- AirforceΔE00 2.473 · #364d70
- Glimpse of VoidΔE00 2.492 · #335588
- AssassinΔE00 2.5 · #2d4f83
9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.