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Recognised as Colour

#663A4E

  • #663A4E
  • Red
  • Dark
  • Nearest: Dim grey

#663A4E is a red with RGB values 102, 58, 78 and HSL 333°, 28%, 31%. 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

#663A4E#663A4E
HEX#663A4E
RGBrgb(102, 58, 78)
RGB (0–1)0.4, 0.2275, 0.3059
RGB percentages40%, 22.7%, 30.6%
HSLhsl(332.7, 27.5%, 31.4%)
HSV / HSBhsv(332.7, 43.1%, 40%)
CMYK0%, 43.1%, 23.5%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,699,598
CSS custom property--colour: #663A4E;

Brightness & contrast

Relative luminance0.06401WCAG 2.x, 0 is black and 1 is white
Perceived brightness76 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.21:1
Contrast with white9.21:1WCAG normal text: AAA
Contrast with black2.28:1WCAG normal text: Fail
Greyscale equivalent#454545
Inverted#99C5B1

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3F434Fno red cones; affects about 1% of men; ΔE 21.6 from the original
Deuteranopia#4A4A4Dno green cones; the most common form, about 1% of men; ΔE 21.9 from the original
Tritanopia#6C3841no blue cones; rare, and affects men and women equally; ΔE 8.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.21:1WCAG large text: AAA
Contrast with black, large text2.28:1WCAG large text: Fail

Named colours

Dim grey · ΔE 26.7Gray · ΔE 32.5Slate grey · ΔE 34Dark slate grey · ΔE 34.1Rosy brown · ΔE 35.2Light slate grey · ΔE 36.2
Nearest named CSS colourDim grey (#696969)ΔE 26.7, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3A6652
Analogous#663A64, #663C3A
Triadic#4E663A, #3A4E66
Split complementary#3A663C, #3A6466
Tetradic#64663A, #3A6652, #3C3A66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CAA2B4
Lighter +30%#B8819A
Lighter +20%#A56180
Lighter +10%#874C67
Darker −10%#452835
Darker −20%#25151C
Darker −30%#040303
Darker −40%#000000
More saturated +25%#7A264C
Less saturated −25%#524E50

Channel breakdown

R102
G58
B78
Red102 (40%)
Green58 (22.7%)
Blue78 (30.6%)
Hue332.73°
Saturation (HSL)27.5%
Lightness31.37%
Dominant channelRed
Hex per channelR 66 · G 3A · B 4E

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Every value on this page was computed from “663a4e” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.