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Recognised as Colour

#181F79

  • #181F79
  • Blue
  • Dark
  • Nearest: Midnight blue

#181F79 is a blue with RGB values 24, 31, 121 and HSL 236°, 67%, 28%. It is a dark colour, so white text on it reaches 13.9:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#181F79#181F79
HEX#181F79
RGBrgb(24, 31, 121)
RGB (0–1)0.0941, 0.1216, 0.4745
RGB percentages9.4%, 12.2%, 47.5%
HSLhsl(235.7, 66.9%, 28.4%)
HSV / HSBhsv(235.7, 80.2%, 47.5%)
CMYK80.2%, 74.4%, 0%, 52.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,580,921
CSS custom property--colour: #181F79;

Brightness & contrast

Relative luminance0.02555WCAG 2.x, 0 is black and 1 is white
Perceived brightness49 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.9:1
Contrast with white13.9:1WCAG normal text: AAA
Contrast with black1.51:1WCAG normal text: Fail
Greyscale equivalent#242424
Inverted#E7E086

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00317Cno red cones; affects about 1% of men; ΔE 14.7 from the original
Deuteranopia#002877no green cones; the most common form, about 1% of men; ΔE 9.4 from the original
Tritanopia#00394Ano blue cones; rare, and affects men and women equally; ΔE 54.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.9:1WCAG large text: AAA
Contrast with black, large text1.51:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 3.1Dark slateblue · ΔE 16.6Rebecca purple · ΔE 19.4Indigo · ΔE 20.7Navy · ΔE 21.6Dark blue · ΔE 26
Nearest named CSS colourMidnight blue (#191970)ΔE 3.1, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#797218
Analogous#185079, #421879
Triadic#79181F, #1F7918
Split complementary#794218, #507918
Tetradic#79184F, #797218, #187941

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7980E4
Lighter +30%#4E58DC
Lighter +20%#2935CE
Lighter +10%#202AA4
Darker −10%#10144E
Darker −20%#070924
Darker −30%#000000
Darker −40%#000000
More saturated +25%#060F8B
Less saturated −25%#2A2F67

Channel breakdown

R24
G31
B121
Red24 (9.4%)
Green31 (12.2%)
Blue121 (47.5%)
Hue235.67°
Saturation (HSL)66.9%
Lightness28.43%
Dominant channelBlue
Hex per channelR 18 · G 1F · B 79

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Every value on this page was computed from “181f79” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.