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Recognised as Colour

#181C9F

  • #181C9F
  • Blue
  • Dark
  • Nearest: Dark blue

#181C9F is a blue with RGB values 24, 28, 159 and HSL 238°, 74%, 36%. It is a dark colour, so white text on it reaches 12.3:1 contrast (AAA for normal text). The nearest named colour is Dark blue.

Colour values

#181C9F#181C9F
HEX#181C9F
RGBrgb(24, 28, 159)
RGB (0–1)0.0941, 0.1098, 0.6235
RGB percentages9.4%, 11%, 62.4%
HSLhsl(238.2, 73.8%, 35.9%)
HSV / HSBhsv(238.2, 84.9%, 62.4%)
CMYK84.9%, 82.4%, 0%, 37.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,580,191
CSS custom property--colour: #181C9F;

Brightness & contrast

Relative luminance0.03528WCAG 2.x, 0 is black and 1 is white
Perceived brightness59.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.31:1
Contrast with white12.31:1WCAG normal text: AAA
Contrast with black1.71:1WCAG normal text: Fail
Greyscale equivalent#252525
Inverted#E7E360

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003CA3no red cones; affects about 1% of men; ΔE 22.5 from the original
Deuteranopia#002E9Dno green cones; the most common form, about 1% of men; ΔE 13.9 from the original
Tritanopia#00465Fno blue cones; rare, and affects men and women equally; ΔE 73.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.31:1WCAG large text: AAA
Contrast with black, large text1.71:1WCAG large text: Fail

Named colours

Dark blue · ΔE 8.5Navy · ΔE 10.1Indigo · ΔE 16.6Rebecca purple · ΔE 24.5Midnight blue · ΔE 24.9Slate blue · ΔE 27.7
Nearest named CSS colourDark blue (#00008B)ΔE 8.48, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9F9B18
Analogous#18609F, #57189F
Triadic#9F181C, #1C9F18
Split complementary#9F5818, #5F9F18
Tetradic#9F1860, #9F9B18, #189F58

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9497EF
Lighter +30%#686CE8
Lighter +20%#3C40E1
Lighter +10%#1F24CB
Darker −10%#111473
Darker −20%#0B0C46
Darker −30%#04051A
Darker −40%#000000
More saturated +25%#0106B6
Less saturated −25%#2F3288

Channel breakdown

R24
G28
B159
Red24 (9.4%)
Green28 (11%)
Blue159 (62.4%)
Hue238.22°
Saturation (HSL)73.77%
Lightness35.88%
Dominant channelBlue
Hex per channelR 18 · G 1C · B 9F

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Every value on this page was computed from “181c9f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.