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Recognised as Colour

#183D72

  • #183D72
  • Blue
  • Dark
  • Nearest: Dark slateblue

#183D72 is a blue with RGB values 24, 61, 114 and HSL 215°, 65%, 27%. 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

#183D72#183D72
HEX#183D72
RGBrgb(24, 61, 114)
RGB (0–1)0.0941, 0.2392, 0.4471
RGB percentages9.4%, 23.9%, 44.7%
HSLhsl(215.3, 65.2%, 27.1%)
HSV / HSBhsv(215.3, 78.9%, 44.7%)
CMYK78.9%, 46.5%, 0%, 55.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,594
CSS custom property--colour: #183D72;

Brightness & contrast

Relative luminance0.04747WCAG 2.x, 0 is black and 1 is white
Perceived brightness62 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.77:1
Contrast with white10.77:1WCAG normal text: AAA
Contrast with black1.95:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#E7C28D

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#224274no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#103A71no green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#004A52no blue cones; rare, and affects men and women equally; ΔE 33.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.77:1WCAG large text: AAA
Contrast with black, large text1.95:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 20.8Steel blue · ΔE 28.9Midnight blue · ΔE 30.5Dark slate grey · ΔE 36.5Slate grey · ΔE 37.1Rebecca purple · ΔE 38.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 20.82, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#724D18
Analogous#186A72, #201872
Triadic#72183D, #3D7218
Split complementary#722018, #6A7218
Tetradic#72186A, #724D18, #187220

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#74A1E2
Lighter +30%#4A85D9
Lighter +20%#2A6AC6
Lighter +10%#21549C
Darker −10%#0F2648
Darker −20%#06101E
Darker −30%#000000
Darker −40%#000000
More saturated +25%#073A83
Less saturated −25%#294061

Channel breakdown

R24
G61
B114
Red24 (9.4%)
Green61 (23.9%)
Blue114 (44.7%)
Hue215.33°
Saturation (HSL)65.22%
Lightness27.06%
Dominant channelBlue
Hex per channelR 18 · G 3D · B 72

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Every value on this page was computed from “183d72” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.