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Recognised as Colour

#663F80

  • #663F80
  • Violet
  • Dark
  • Nearest: Dark slateblue

#663F80 is a violet with RGB values 102, 63, 128 and HSL 276°, 34%, 37%. It is a dark colour, so white text on it reaches 8.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#663F80#663F80
HEX#663F80
RGBrgb(102, 63, 128)
RGB (0–1)0.4, 0.2471, 0.502
RGB percentages40%, 24.7%, 50.2%
HSLhsl(276, 34%, 37.5%)
HSV / HSBhsv(276, 50.8%, 50.2%)
CMYK20.3%, 50.8%, 0%, 49.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,700,928
CSS custom property--colour: #663F80;

Brightness & contrast

Relative luminance0.07938WCAG 2.x, 0 is black and 1 is white
Perceived brightness85.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.12:1
Contrast with white8.12:1WCAG normal text: AAA
Contrast with black2.59:1WCAG normal text: Fail
Greyscale equivalent#4C4C4C
Inverted#99C07F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2F4E82no red cones; affects about 1% of men; ΔE 24 from the original
Deuteranopia#3A507Eno green cones; the most common form, about 1% of men; ΔE 24.1 from the original
Tritanopia#634A59no blue cones; rare, and affects men and women equally; ΔE 30.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.12:1WCAG large text: AAA
Contrast with black, large text2.59:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12.8Rebecca purple · ΔE 21.3Midnight blue · ΔE 26.5Medium purple · ΔE 29.8Purple · ΔE 30Slate blue · ΔE 30.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.8, a distinctly different colour
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#59803F
Analogous#453F80, #803F7A
Triadic#80663F, #3F8066
Split complementary#7A803F, #3F8046
Tetradic#80463F, #59803F, #3F7A80

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9B2D9
Lighter +30%#B290C8
Lighter +20%#9A6EB7
Lighter +10%#8150A2
Darker −10%#4B2E5E
Darker −20%#301D3C
Darker −30%#140D19
Darker −40%#000000
More saturated +25%#6B2798
Less saturated −25%#615768

Channel breakdown

R102
G63
B128
Red102 (40%)
Green63 (24.7%)
Blue128 (50.2%)
Hue276°
Saturation (HSL)34.03%
Lightness37.45%
Dominant channelBlue
Hex per channelR 66 · G 3F · B 80

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Every value on this page was computed from “663f80” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.