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Recognised as Colour

#181E3F

  • #181E3F
  • Blue
  • Dark
  • Nearest: Black

#181E3F is a blue with RGB values 24, 30, 63 and HSL 231°, 45%, 17%. It is a dark colour, so white text on it reaches 16.2:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#181E3F#181E3F
HEX#181E3F
RGBrgb(24, 30, 63)
RGB (0–1)0.0941, 0.1176, 0.2471
RGB percentages9.4%, 11.8%, 24.7%
HSLhsl(230.8, 44.8%, 17.1%)
HSV / HSBhsv(230.8, 61.9%, 24.7%)
CMYK61.9%, 52.4%, 0%, 75.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,580,607
CSS custom property--colour: #181E3F;

Brightness & contrast

Relative luminance0.01482WCAG 2.x, 0 is black and 1 is white
Perceived brightness34 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 16.2:1
Contrast with white16.2:1WCAG normal text: AAA
Contrast with black1.3:1WCAG normal text: Fail
Greyscale equivalent#1F1F1F
Inverted#E7E1C0

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0F2240no red cones; affects about 1% of men; ΔE 4.8 from the original
Deuteranopia#0B1F3Eno green cones; the most common form, about 1% of men; ΔE 4.1 from the original
Tritanopia#05252Bno blue cones; rare, and affects men and women equally; ΔE 23.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text16.2:1WCAG large text: AAA
Contrast with black, large text1.3:1WCAG large text: Fail

Named colours

Black · ΔE 26.8Dark slateblue · ΔE 32.1Dark slate grey · ΔE 33.4Midnight blue · ΔE 35.9Dim grey · ΔE 39.8Steel blue · ΔE 43.3
Nearest named CSS colourBlack (#000000)ΔE 26.82, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3F3918
Analogous#18323F, #25183F
Triadic#3F181E, #1E3F18
Split complementary#3F2618, #313F18
Tetradic#3F1832, #3F3918, #183F26

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6070C3
Lighter +30%#4253AE
Lighter +20%#344189
Lighter +10%#263064
Darker −10%#0A0C1A
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0D164A
Less saturated −25%#232634

Channel breakdown

R24
G30
B63
Red24 (9.4%)
Green30 (11.8%)
Blue63 (24.7%)
Hue230.77°
Saturation (HSL)44.83%
Lightness17.06%
Dominant channelBlue
Hex per channelR 18 · G 1E · B 3F

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Every value on this page was computed from “181e3f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.