Underwater World
#657f7a
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
#657f7a
RGB
101, 127, 122
OKLCh
57.5% 0.031 182.2°
CIELAB (D50)
51.0, -10.6, -0.5
What is true of this colour, and of no other
- 3 other named colours sit within ΔE00 2 of it.
- It uses only 30% of the chroma available at this lightness and hue — there is a far more vivid version of this colour inside sRGB.
- As text on white it measures APCA Lc 69.8; on black, Lc -31.8. 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.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 11.4 and 12.3 and 24.2 — no red cone.
Text on this colour
White text
4.31:1 — large text only
Black text
4.87:1 — passes AA
Black text is the better of the two at4.87:1. That is enough for body text.
As text on white, it needs to change
#627c77 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.
The same colour, with one cone missing
As you see it
#657f7a
protanopia
#7c7c7a · ΔE00 11.4
deuteranopia
#78787b · ΔE00 12.3
tritanopia
#7373b1 · ΔE00 24.2
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isAspen Valley at ΔE00 1.02: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Aspen ValleyΔE00 1.02 · #687f7a
- Teal StencilΔE00 1.036 · #627f7b
- Sabiasagi BlueΔE00 1.737 · #6a7f7a
- Refreshing GreenΔE00 2.01 · #617a74
- Salal LeavesΔE00 2.055 · #637d74
- PenzanceΔE00 2.057 · #627e75
- Dark LagoonΔE00 2.371 · #6a7f7d
- Studio Blue GreenΔE00 2.426 · #6d817b
- Forest EdgeΔE00 2.48 · #627b72
- Bournonite GreenΔE00 2.503 · #637a72
- StockleafΔE00 2.56 · #647b72
- Stream BurbleΔE00 2.586 · #5e7e7d
11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.