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Recognised as Colour

#663B50

  • #663B50
  • Red
  • Dark
  • Nearest: Dim grey

#663B50 is a red with RGB values 102, 59, 80 and HSL 331°, 27%, 32%. It is a dark colour, so white text on it reaches 9.1:1 contrast (AAA for normal text). The nearest named colour is Dim grey.

Colour values

#663B50#663B50
HEX#663B50
RGBrgb(102, 59, 80)
RGB (0–1)0.4, 0.2314, 0.3137
RGB percentages40%, 23.1%, 31.4%
HSLhsl(330.7, 26.7%, 31.6%)
HSV / HSBhsv(330.7, 42.2%, 40%)
CMYK0%, 42.2%, 21.6%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,699,856
CSS custom property--colour: #663B50;

Brightness & contrast

Relative luminance0.06532WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.11:1
Contrast with white9.11:1WCAG normal text: AAA
Contrast with black2.31:1WCAG normal text: Fail
Greyscale equivalent#464646
Inverted#99C4AF

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3F4451no red cones; affects about 1% of men; ΔE 21.4 from the original
Deuteranopia#4A4B4Fno green cones; the most common form, about 1% of men; ΔE 21.8 from the original
Tritanopia#6C3A42no blue cones; rare, and affects men and women equally; ΔE 9.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.11:1WCAG large text: AAA
Contrast with black, large text2.31:1WCAG large text: Fail

Named colours

Dim grey · ΔE 26.4Gray · ΔE 32.2Slate grey · ΔE 33.4Dark slate grey · ΔE 33.9Rosy brown · ΔE 35.1Light slate grey · ΔE 35.7
Nearest named CSS colourDim grey (#696969)ΔE 26.45, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3B6651
Analogous#663B65, #663C3B
Triadic#50663B, #3B5066
Split complementary#3B663C, #3B6566
Tetradic#65663B, #3B6651, #3C3B66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CAA3B6
Lighter +30%#B7839C
Lighter +20%#A46383
Lighter +10%#864E69
Darker −10%#462837
Darker −20%#25161D
Darker −30%#050304
Darker −40%#000000
More saturated +25%#7A2750
Less saturated −25%#524F50

Channel breakdown

R102
G59
B80
Red102 (40%)
Green59 (23.1%)
Blue80 (31.4%)
Hue330.7°
Saturation (HSL)26.71%
Lightness31.57%
Dominant channelRed
Hex per channelR 66 · G 3B · B 50

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Every value on this page was computed from “663b50” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.