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Recognised as Colour

#663A89

  • #663A89
  • Violet
  • Dark
  • Nearest: Dark slateblue

#663A89 is a violet with RGB values 102, 58, 137 and HSL 273°, 41%, 38%. It is a dark colour, so white text on it reaches 8.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#663A89#663A89
HEX#663A89
RGBrgb(102, 58, 137)
RGB (0–1)0.4, 0.2275, 0.5373
RGB percentages40%, 22.7%, 53.7%
HSLhsl(273.4, 40.5%, 38.2%)
HSV / HSBhsv(273.4, 57.7%, 53.7%)
CMYK25.5%, 57.7%, 0%, 46.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,699,657
CSS custom property--colour: #663A89;

Brightness & contrast

Relative luminance0.07657WCAG 2.x, 0 is black and 1 is white
Perceived brightness85 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.3:1
Contrast with white8.3:1WCAG normal text: AAA
Contrast with black2.53:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#99C576

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1F4D8Cno red cones; affects about 1% of men; ΔE 27.3 from the original
Deuteranopia#2F4F87no green cones; the most common form, about 1% of men; ΔE 27.9 from the original
Tritanopia#61495Cno blue cones; rare, and affects men and women equally; ΔE 36.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.3:1WCAG large text: AAA
Contrast with black, large text2.53:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 10.7Rebecca purple · ΔE 13Midnight blue · ΔE 21.9Purple · ΔE 24.2Slate blue · ΔE 24.2Medium purple · ΔE 25.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10.71, a distinctly different colour
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5D893A
Analogous#3F3A89, #893A84
Triadic#89663A, #3A8966
Split complementary#84893A, #3A893F
Tetradic#893F3A, #5D893A, #3A8489

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CAB1DE
Lighter +30%#B28DCF
Lighter +20%#9969C0
Lighter +10%#8149AD
Darker −10%#4B2B65
Darker −20%#311C41
Darker −30%#160C1E
Darker −40%#000000
More saturated +25%#6922A1
Less saturated −25%#635271

Channel breakdown

R102
G58
B137
Red102 (40%)
Green58 (22.7%)
Blue137 (53.7%)
Hue273.42°
Saturation (HSL)40.51%
Lightness38.24%
Dominant channelBlue
Hex per channelR 66 · G 3A · B 89

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Every value on this page was computed from “663a89” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.