Recognised as Colour

#181B39

#181B39
Blue
Dark
Nearest: Black

#181B39 is a blue with RGB values 24, 27, 57 and HSL 235°, 41%, 16%. It is a dark colour, so white text on it reaches 16.7:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#181B39#181B39

HEX#181B39

RGBrgb(24, 27, 57)

RGB (0–1)0.0941, 0.1059, 0.2235

RGB percentages9.4%, 10.6%, 22.4%

HSLhsl(234.5, 40.7%, 15.9%)

HSV / HSBhsv(234.5, 57.9%, 22.4%)

CMYK57.9%, 52.6%, 0%, 77.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer1,579,833

CSS custom property--colour: #181B39;

Brightness & contrast

Relative luminance0.01273WCAG 2.x, 0 is black and 1 is white

Perceived brightness31.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 16.74:1

Contrast with white16.74:1WCAG normal text: AAA

Contrast with black1.25:1WCAG normal text: Fail

Greyscale equivalent#1D1D1D

Inverted#E7E4C6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#0E1F3Ano red cones; affects about 1% of men; ΔE 5.2 from the original

Deuteranopia#0B1C38no green cones; the most common form, about 1% of men; ΔE 4.4 from the original

Tritanopia#0B2127no blue cones; rare, and affects men and women equally; ΔE 20.3 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text16.74:1WCAG large text: AAA

Contrast with black, large text1.25:1WCAG large text: Fail

Named colours

Black · ΔE 24.5 Dark slate grey · ΔE 33.1 Dark slateblue · ΔE 34.3 Midnight blue · ΔE 37.7 Dim grey · ΔE 39.9 Slate grey · ΔE 44.2

Nearest named CSS colourBlack (#000000)ΔE 24.51, a distinctly different colour

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#393618

Analogous#182C39, #251839

Triadic#39181B, #1B3918

Split complementary#392618, #2B3918

Tetradic#39182C, #393618, #183926

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#6169BC

Lighter +30%#454EA5

Lighter +20%#363D81

Lighter +10%#272C5D

Darker −10%#090A15

Darker −20%#000000

Darker −30%#000000

Darker −40%#000000

More saturated +25%#0E1343

Less saturated −25%#22232F

Channel breakdown

R24

G27

B57

Red24 (9.4%)

Green27 (10.6%)

Blue57 (22.4%)

Hue234.55°

Saturation (HSL)40.74%

Lightness15.88%

Dominant channelBlue

Hex per channelR 18 · G 1B · B 39

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#181B39

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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