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Recognised as Colour

#183B79

  • #183B79
  • Blue
  • Dark
  • Nearest: Dark slateblue

#183B79 is a blue with RGB values 24, 59, 121 and HSL 218°, 67%, 28%. It is a dark colour, so white text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#183B79#183B79
HEX#183B79
RGBrgb(24, 59, 121)
RGB (0–1)0.0941, 0.2314, 0.4745
RGB percentages9.4%, 23.1%, 47.5%
HSLhsl(218.4, 66.9%, 28.4%)
HSV / HSBhsv(218.4, 80.2%, 47.5%)
CMYK80.2%, 51.2%, 0%, 52.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,089
CSS custom property--colour: #183B79;

Brightness & contrast

Relative luminance0.04703WCAG 2.x, 0 is black and 1 is white
Perceived brightness62.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.82:1
Contrast with white10.82:1WCAG normal text: AAA
Contrast with black1.94:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E7C486

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#16427Bno red cones; affects about 1% of men; ΔE 5.4 from the original
Deuteranopia#003978no green cones; the most common form, about 1% of men; ΔE 2.2 from the original
Tritanopia#004A54no blue cones; rare, and affects men and women equally; ΔE 38.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.82:1WCAG large text: AAA
Contrast with black, large text1.94:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 15.6Midnight blue · ΔE 24.8Steel blue · ΔE 31.6Rebecca purple · ΔE 33Slate blue · ΔE 36.4Royal blue · ΔE 37.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 15.55, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#795618
Analogous#186C79, #261879
Triadic#79183B, #3B7918
Split complementary#792618, #6B7918
Tetradic#79186B, #795618, #187925

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#79A0E4
Lighter +30%#4E81DC
Lighter +20%#2965CE
Lighter +10%#2050A4
Darker −10%#10264E
Darker −20%#071124
Darker −30%#000000
Darker −40%#000000
More saturated +25%#06368B
Less saturated −25%#2A4067

Channel breakdown

R24
G59
B121
Red24 (9.4%)
Green59 (23.1%)
Blue121 (47.5%)
Hue218.35°
Saturation (HSL)66.9%
Lightness28.43%
Dominant channelBlue
Hex per channelR 18 · G 3B · B 79

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Every value on this page was computed from “183b79” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.