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Recognised as Colour

#333D81

  • #333D81
  • Blue
  • Dark
  • Nearest: Dark slateblue

#333D81 is a blue with RGB values 51, 61, 129 and HSL 232°, 43%, 35%. It is a dark colour, so white text on it reaches 9.9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#333D81#333D81
HEX#333D81
RGBrgb(51, 61, 129)
RGB (0–1)0.2, 0.2392, 0.5059
RGB percentages20%, 23.9%, 50.6%
HSLhsl(232.3, 43.3%, 35.3%)
HSV / HSBhsv(232.3, 60.5%, 50.6%)
CMYK60.5%, 52.7%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,358,081
CSS custom property--colour: #333D81;

Brightness & contrast

Relative luminance0.05626WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.88:1
Contrast with white9.88:1WCAG normal text: AAA
Contrast with black2.13:1WCAG normal text: Fail
Greyscale equivalent#404040
Inverted#CCC27E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#184783no red cones; affects about 1% of men; ΔE 10.8 from the original
Deuteranopia#084080no green cones; the most common form, about 1% of men; ΔE 8.4 from the original
Tritanopia#004D59no blue cones; rare, and affects men and women equally; ΔE 43.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.88:1WCAG large text: AAA
Contrast with black, large text2.13:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 8.7Midnight blue · ΔE 21.1Rebecca purple · ΔE 26.4Slate blue · ΔE 30.6Royal blue · ΔE 33.1Steel blue · ΔE 33.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 8.75, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#817733
Analogous#336481, #503381
Triadic#81333D, #3D8133
Split complementary#815033, #648133
Tetradic#813364, #817733, #338150

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A5ACDB
Lighter +30%#808ACD
Lighter +20%#5C68BE
Lighter +10%#414EA6
Darker −10%#252C5C
Darker −20%#161A38
Darker −30%#080913
Darker −40%#000000
More saturated +25%#1C2C98
Less saturated −25%#4A4E6A

Channel breakdown

R51
G61
B129
Red51 (20%)
Green61 (23.9%)
Blue129 (50.6%)
Hue232.31°
Saturation (HSL)43.33%
Lightness35.29%
Dominant channelBlue
Hex per channelR 33 · G 3D · B 81

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Every value on this page was computed from “333d81” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.