Purple Emperor
#6633bb
A violet that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#6633bb
RGB
102, 51, 187
OKLCh
46.8% 0.199 294.5°
CIELAB (D50)
34.7, 45.4, -64.3
What is true of this colour, and of no other
- One other named colour sits within ΔE00 2 of it.
- It uses 77% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 85.7; on black, Lc -16.4. 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 8.5 and 8.9 and 14.5 — no red cone.
Text on this colour
White text
7.62:1 — passes AA
Black text
2.76:1 — fails AA
White text is the better of the two at7.62:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#6633bb
protanopia
#3b3bbb · ΔE00 8.5
deuteranopia
#4747bb · ΔE00 8.9
tritanopia
#51517b · ΔE00 14.5
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isPurple Spot at ΔE00 1.363: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Purple SpotΔE00 1.363 · #652dc1
- Sagat PurpleΔE00 2.025 · #6a31ca
- Rabbit-Ear IrisΔE00 2.794 · #6225b8
- RoyaltyΔE00 3.223 · #5930a9
- Illustrious IndigoΔE00 3.342 · #5533bb
- Crown ChakraΔE00 3.86 · #701dce
- Puissant PurpleΔE00 3.996 · #7722cc
- Dragonlord PurpleΔE00 4.217 · #6241c7
- Nasu PurpleΔE00 4.241 · #5d21d0
- Blue PurpleΔE00 4.26 · #5729ce
- Grape HyacinthΔE00 4.372 · #5533cc
- Blue VioletΔE00 4.523 · #4e32b2
11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.