Hong Kong Taxi
#a8102a
A red that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#a8102a
RGB
168, 16, 42
OKLCh
46.8% 0.180 21.0°
CIELAB (D50)
36.4, 57.7, 30.2
What is true of this colour, and of no other
- 6 other named colours sit within ΔE00 2 of it.
- It uses 96% 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 84.3; on black, Lc -17.7. 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 33.2 and 40.8 and 47.4 — no red cone.
Text on this colour
White text
7.57:1 — passes AA
Black text
2.77:1 — fails AA
White text is the better of the two at7.57:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#a8102a
protanopia
#3e3e2c · ΔE00 33.2
deuteranopia
#616120 · ΔE00 40.8
tritanopia
#7a7a00 · ΔE00 47.4
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isJester Red at ΔE00 0.857: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Jester RedΔE00 0.857 · #ac112c
- Haute RedΔE00 1.371 · #aa1829
- Cut RubyΔE00 1.688 · #a01c2d
- Tango RedΔE00 1.908 · #b10e2a
- Barbados CherryΔE00 1.96 · #af0a30
- IncarnadineΔE00 1.992 · #aa0022
- Red-Hot MamaΔE00 2.161 · #a91f29
- Christmas RedΔE00 2.167 · #b01b2e
- KirschΔE00 2.264 · #b2132b
- Castlevania HeartΔE00 2.408 · #a80020
- Haute CoutureΔE00 2.505 · #a0252a
- Scarlet SageΔE00 2.572 · #aa2335
9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.