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Recognised as Colour

#183D83

  • #183D83
  • Blue
  • Dark
  • Nearest: Dark slateblue

#183D83 is a blue with RGB values 24, 61, 131 and HSL 219°, 69%, 30%. It is a dark colour, so white text on it reaches 10.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#183D83#183D83
HEX#183D83
RGBrgb(24, 61, 131)
RGB (0–1)0.0941, 0.2392, 0.5137
RGB percentages9.4%, 23.9%, 51.4%
HSLhsl(219.3, 69%, 30.4%)
HSV / HSBhsv(219.3, 81.7%, 51.4%)
CMYK81.7%, 53.4%, 0%, 48.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,611
CSS custom property--colour: #183D83;

Brightness & contrast

Relative luminance0.0517WCAG 2.x, 0 is black and 1 is white
Perceived brightness65.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.32:1
Contrast with white10.32:1WCAG normal text: AAA
Contrast with black2.03:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E7C27C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0D4586no red cones; affects about 1% of men; ΔE 6.1 from the original
Deuteranopia#003C82no green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#004E5Ano blue cones; rare, and affects men and women equally; ΔE 42.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.32:1WCAG large text: AAA
Contrast with black, large text2.03:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12.3Midnight blue · ΔE 21.7Rebecca purple · ΔE 29.4Slate blue · ΔE 31.8Royal blue · ΔE 32.5Steel blue · ΔE 33.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.27, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#835E18
Analogous#187283, #291883
Triadic#83183D, #3D8318
Split complementary#832918, #728318
Tetradic#831872, #835E18, #188329

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7FA3E8
Lighter +30%#5484E0
Lighter +20%#2966D8
Lighter +10%#2051AE
Darker −10%#102958
Darker −20%#08152D
Darker −30%#000102
Darker −40%#000000
More saturated +25%#053796
Less saturated −25%#2B4370

Channel breakdown

R24
G61
B131
Red24 (9.4%)
Green61 (23.9%)
Blue131 (51.4%)
Hue219.25°
Saturation (HSL)69.03%
Lightness30.39%
Dominant channelBlue
Hex per channelR 18 · G 3D · B 83

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Every value on this page was computed from “183d83” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.