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Recognised as Colour

#181B58

  • #181B58
  • Blue
  • Dark
  • Nearest: Midnight blue

#181B58 is a blue with RGB values 24, 27, 88 and HSL 237°, 57%, 22%. It is a dark colour, so white text on it reaches 15.7:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#181B58#181B58
HEX#181B58
RGBrgb(24, 27, 88)
RGB (0–1)0.0941, 0.1059, 0.3451
RGB percentages9.4%, 10.6%, 34.5%
HSLhsl(237.2, 57.1%, 22%)
HSV / HSBhsv(237.2, 72.7%, 34.5%)
CMYK72.7%, 69.3%, 0%, 65.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,579,864
CSS custom property--colour: #181B58;

Brightness & contrast

Relative luminance0.01683WCAG 2.x, 0 is black and 1 is white
Perceived brightness38.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.71:1
Contrast with white15.71:1WCAG normal text: AAA
Contrast with black1.34:1WCAG normal text: Fail
Greyscale equivalent#1F1F1F
Inverted#E7E4A7

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00265Ano red cones; affects about 1% of men; ΔE 10.8 from the original
Deuteranopia#002057no green cones; the most common form, about 1% of men; ΔE 7.1 from the original
Tritanopia#002B36no blue cones; rare, and affects men and women equally; ΔE 40.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.71:1WCAG large text: AAA
Contrast with black, large text1.34:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 16.4Dark slateblue · ΔE 18.4Rebecca purple · ΔE 30.6Indigo · ΔE 35.2Navy · ΔE 38.1Slate blue · ΔE 40.5
Nearest named CSS colourMidnight blue (#191970)ΔE 16.39, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#585518
Analogous#183B58, #351858
Triadic#58181B, #1B5818
Split complementary#583518, #3B5818
Tetradic#58183B, #585518, #185835

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#676CD5
Lighter +30%#3F45CB
Lighter +20%#2E34A8
Lighter +10%#232780
Darker −10%#0D0F30
Darker −20%#020208
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A0E66
Less saturated −25%#26284A

Channel breakdown

R24
G27
B88
Red24 (9.4%)
Green27 (10.6%)
Blue88 (34.5%)
Hue237.19°
Saturation (HSL)57.14%
Lightness21.96%
Dominant channelBlue
Hex per channelR 18 · G 1B · B 58

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Every value on this page was computed from “181b58” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.