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Recognised as Colour

#663F48

  • #663F48
  • Red
  • Dark
  • Nearest: Dim grey

#663F48 is a red with RGB values 102, 63, 72 and HSL 346°, 24%, 32%. It is a dark colour, so white text on it reaches 8.9:1 contrast (AAA for normal text). The nearest named colour is Dim grey.

Colour values

#663F48#663F48
HEX#663F48
RGBrgb(102, 63, 72)
RGB (0–1)0.4, 0.2471, 0.2824
RGB percentages40%, 24.7%, 28.2%
HSLhsl(346.2, 23.6%, 32.4%)
HSV / HSBhsv(346.2, 38.2%, 40%)
CMYK0%, 38.2%, 29.4%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,700,872
CSS custom property--colour: #663F48;

Brightness & contrast

Relative luminance0.06848WCAG 2.x, 0 is black and 1 is white
Perceived brightness77.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.86:1
Contrast with white8.86:1WCAG normal text: AAA
Contrast with black2.37:1WCAG normal text: Fail
Greyscale equivalent#484848
Inverted#99C0B7

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#454648no red cones; affects about 1% of men; ΔE 18.7 from the original
Deuteranopia#4E4D47no green cones; the most common form, about 1% of men; ΔE 19.4 from the original
Tritanopia#6C3C42no blue cones; rare, and affects men and women equally; ΔE 5.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.86:1WCAG large text: AAA
Contrast with black, large text2.37:1WCAG large text: Fail

Named colours

Dim grey · ΔE 22.6Gray · ΔE 28.8Dark slate grey · ΔE 30.6Slate grey · ΔE 32.1Rosy brown · ΔE 32.6Light slate grey · ΔE 34.5
Nearest named CSS colourDim grey (#696969)ΔE 22.56, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3F665D
Analogous#663F5B, #664A3F
Triadic#48663F, #3F4866
Split complementary#3F664A, #3F5B66
Tetradic#5B663F, #3F665D, #4A3F66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9A8B0
Lighter +30%#B68893
Lighter +20%#A26976
Lighter +10%#86525E
Darker −10%#462C32
Darker −20%#27181B
Darker −30%#070505
Darker −40%#000000
More saturated +25%#7B2A3D
Less saturated −25%#525252

Channel breakdown

R102
G63
B72
Red102 (40%)
Green63 (24.7%)
Blue72 (28.2%)
Hue346.15°
Saturation (HSL)23.64%
Lightness32.35%
Dominant channelRed
Hex per channelR 66 · G 3F · B 48

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Every value on this page was computed from “663f48” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.