Indigo
#4b0082
A violet that is saturated. It is dark — it carries white text and needs care with black.
Hex
#4b0082
RGB
75, 0, 130
OKLCh
33.9% 0.179 301.7°
CIELAB (D50)
19.7, 47.0, -54.3
What is true of this colour, and of no other
- 4 other named colours sit within ΔE00 2 of it.
- It sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
- As text on white it measures APCA Lc 97.2; on black, Lc 0.0. 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 9.8 and 11.1 and 46.0 — no red cone.
Text on this colour
White text
12.95:1 — passes AA
Black text
1.62:1 — fails AA
White text is the better of the two at12.95:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#4b0082
protanopia
#161682 · ΔE00 9.8
deuteranopia
#272782 · ΔE00 11.1
tritanopia
#34341c · ΔE00 46.0
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isIndigo Static at ΔE00 0.212: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Indigo StaticΔE00 0.212 · #4b0183
- Pigment IndigoΔE00 0.424 · #4d0082
- Invasive IndigoΔE00 0.635 · #49017e
- Indigo GirlsΔE00 1.778 · #4d0e88
- Grim PurpleΔE00 2.884 · #441188
- Pitch VioletΔE00 2.993 · #4a148c
- MarionberryΔE00 3.753 · #380282
- Royal PurpleΔE00 3.763 · #4b006e
- SQL Injection PurpleΔE00 3.771 · #5e0092
- American VioletΔE00 3.948 · #551b8c
- OccultΔE00 4.143 · #4b1e87
- Amarklor VioletΔE00 4.149 · #551199
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.