HueComb

Orion Nebula

#a55af4

A violet that is about as vivid as sRGB can show at this lightness. It is light — black text sits on it comfortably, white text does not.

Hex

#a55af4

RGB

165, 90, 244

OKLCh

62.8% 0.222 302.9°

CIELAB (D50)

53.2, 52.7, -66.5

What is true of this colour, and of no other

  • 2 other named colours sit within ΔE00 2 of it.
  • It uses 90% 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 65.9; on black, Lc -35.7. 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 13.6 and 13.4 and 58.1 — no red cone.

Text on this colour

White text

3.91:1 — large text only

Black text

5.37:1 — passes AA

Black text is the better of the two at5.37:1. That is enough for body text.

As text on white, it needs to change

#9b4fe8 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.

Try it against your own background

The same colour, with one cone missing

As you see it

#a55af4

protanopia

#6666f4 · ΔE00 13.6

deuteranopia

#7676f3 · ΔE00 13.4

tritanopia

#868650 · ΔE00 58.1

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isVega Violet at ΔE00 1.574: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

  • Vega VioletΔE00 1.574 · #aa55ff
  • Light Shōtoku PurpleΔE00 1.954 · #aa55ee
  • Aconite VioletΔE00 2.807 · #9c52f2
  • Lightish PurpleΔE00 3.045 · #a552e6
  • Forgotten KyawthuiteΔE00 3.318 · #955af2
  • Irrigo PurpleΔE00 3.45 · #9955ff
  • Purple HedonistΔE00 3.516 · #aa66ff
  • Navy Genesis EvangelionΔE00 3.581 · #9556eb
  • Lavender IndigoΔE00 3.668 · #9457eb
  • Pisces Vivid AmethystΔE00 4.529 · #ab46ec
  • Legendary LavenderΔE00 4.768 · #9d61d4
  • Violet VoltageΔE00 5.225 · #a669db

10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.