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Recognised as Colour

#181D83

  • #181D83
  • Blue
  • Dark
  • Nearest: Midnight blue

#181D83 is a blue with RGB values 24, 29, 131 and HSL 237°, 69%, 30%. It is a dark colour, so white text on it reaches 13.6:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#181D83#181D83
HEX#181D83
RGBrgb(24, 29, 131)
RGB (0–1)0.0941, 0.1137, 0.5137
RGB percentages9.4%, 11.4%, 51.4%
HSLhsl(237.2, 69%, 30.4%)
HSV / HSBhsv(237.2, 81.7%, 51.4%)
CMYK81.7%, 77.9%, 0%, 48.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,580,419
CSS custom property--colour: #181D83;

Brightness & contrast

Relative luminance0.02712WCAG 2.x, 0 is black and 1 is white
Perceived brightness51.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.62:1
Contrast with white13.62:1WCAG normal text: AAA
Contrast with black1.54:1WCAG normal text: Fail
Greyscale equivalent#232323
Inverted#E7E27C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003386no red cones; affects about 1% of men; ΔE 17.2 from the original
Deuteranopia#002881no green cones; the most common form, about 1% of men; ΔE 10.2 from the original
Tritanopia#003B4Fno blue cones; rare, and affects men and women equally; ΔE 60.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.62:1WCAG large text: AAA
Contrast with black, large text1.54:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 8.9Navy · ΔE 15.1Indigo · ΔE 16.1Rebecca purple · ΔE 18.4Dark blue · ΔE 19.1Dark slateblue · ΔE 21.4
Nearest named CSS colourMidnight blue (#191970)ΔE 8.93, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#837E18
Analogous#185383, #481883
Triadic#83181D, #1D8318
Split complementary#834818, #538318
Tetradic#831853, #837E18, #188348

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7F84E8
Lighter +30%#545BE0
Lighter +20%#2931D8
Lighter +10%#2027AE
Darker −10%#101358
Darker −20%#080A2D
Darker −30%#000002
Darker −40%#000000
More saturated +25%#050B96
Less saturated −25%#2B2F70

Channel breakdown

R24
G29
B131
Red24 (9.4%)
Green29 (11.4%)
Blue131 (51.4%)
Hue237.2°
Saturation (HSL)69.03%
Lightness30.39%
Dominant channelBlue
Hex per channelR 18 · G 1D · B 83

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Every value on this page was computed from “181d83” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.