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Recognised as Colour

#663B4C

  • #663B4C
  • Red
  • Dark
  • Nearest: Dim grey

#663B4C is a red with RGB values 102, 59, 76 and HSL 336°, 27%, 32%. It is a dark colour, so white text on it reaches 9.2:1 contrast (AAA for normal text). The nearest named colour is Dim grey.

Colour values

#663B4C#663B4C
HEX#663B4C
RGBrgb(102, 59, 76)
RGB (0–1)0.4, 0.2314, 0.298
RGB percentages40%, 23.1%, 29.8%
HSLhsl(336.3, 26.7%, 31.6%)
HSV / HSBhsv(336.3, 42.2%, 40%)
CMYK0%, 42.2%, 25.5%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,699,852
CSS custom property--colour: #663B4C;

Brightness & contrast

Relative luminance0.06475WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.15:1
Contrast with white9.15:1WCAG normal text: AAA
Contrast with black2.29:1WCAG normal text: Fail
Greyscale equivalent#454545
Inverted#99C4B3

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#40434Dno red cones; affects about 1% of men; ΔE 20.8 from the original
Deuteranopia#4B4B4Bno green cones; the most common form, about 1% of men; ΔE 21.6 from the original
Tritanopia#6C3941no blue cones; rare, and affects men and women equally; ΔE 7.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.15:1WCAG large text: AAA
Contrast with black, large text2.29:1WCAG large text: Fail

Named colours

Dim grey · ΔE 25.6Gray · ΔE 31.5Dark slate grey · ΔE 33.2Slate grey · ΔE 33.5Rosy brown · ΔE 34.5Light slate grey · ΔE 35.8
Nearest named CSS colourDim grey (#696969)ΔE 25.64, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3B6655
Analogous#663B62, #663F3B
Triadic#4C663B, #3B4C66
Split complementary#3B663F, #3B6266
Tetradic#62663B, #3B6655, #3F3B66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CAA3B2
Lighter +30%#B78398
Lighter +20%#A4637D
Lighter +10%#864E64
Darker −10%#462834
Darker −20%#25161C
Darker −30%#050304
Darker −40%#000000
More saturated +25%#7A2748
Less saturated −25%#524F50

Channel breakdown

R102
G59
B76
Red102 (40%)
Green59 (23.1%)
Blue76 (29.8%)
Hue336.28°
Saturation (HSL)26.71%
Lightness31.57%
Dominant channelRed
Hex per channelR 66 · G 3B · B 4C

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Every value on this page was computed from “663b4c” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.