Calypso
#3d7188
A cyan 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
#3d7188
RGB
61, 113, 136
OKLCh
52.2% 0.066 228.7°
CIELAB (D50)
44.8, -12.8, -18.4
What is true of this colour, and of no other
- 8 other named colours sit within ΔE00 2 of it.
- It uses 65% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 76.6; on black, Lc -25.2. 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 18.2 and 18.1 and 15.5 — no red cone.
Text on this colour
White text
5.36:1 — passes AA
Black text
3.92:1 — large text only
White text is the better of the two at5.36:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#3d7188
protanopia
#6d6d88 · ΔE00 18.2
deuteranopia
#656589 · ΔE00 18.1
tritanopia
#5c5ccc · ΔE00 15.5
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isAm I Blue? at ΔE00 0.833: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Am I Blue?ΔE00 0.833 · #417086
- Crashing WavesΔE00 1.013 · #3e6f87
- Bengal BlueΔE00 1.127 · #38738b
- AstralΔE00 1.296 · #376f89
- Bering WaveΔE00 1.521 · #3d6d84
- Living StreamΔE00 1.682 · #37708c
- Santorini BlueΔE00 1.819 · #416d83
- DownpourΔE00 1.964 · #43718b
- Soul SearchΔE00 2.23 · #377290
- English RiverΔE00 2.462 · #3c768a
- Lake StreamΔE00 2.48 · #3e6b83
- Big Ocean WaveΔE00 2.573 · #34708f
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.