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Recognised as Colour

#183F77

  • #183F77
  • Blue
  • Dark
  • Nearest: Dark slateblue

#183F77 is a blue with RGB values 24, 63, 119 and HSL 215°, 66%, 28%. It is a dark colour, so white text on it reaches 10.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#183F77#183F77
HEX#183F77
RGBrgb(24, 63, 119)
RGB (0–1)0.0941, 0.2471, 0.4667
RGB percentages9.4%, 24.7%, 46.7%
HSLhsl(215.4, 66.4%, 28%)
HSV / HSBhsv(215.4, 79.8%, 46.7%)
CMYK79.8%, 47.1%, 0%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,589,111
CSS custom property--colour: #183F77;

Brightness & contrast

Relative luminance0.05081WCAG 2.x, 0 is black and 1 is white
Perceived brightness64.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.42:1
Contrast with white10.42:1WCAG normal text: AAA
Contrast with black2.02:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#E7C088

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#224479no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#0D3C76no green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#004C55no blue cones; rare, and affects men and women equally; ΔE 35.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.42:1WCAG large text: AAA
Contrast with black, large text2.02:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.4Steel blue · ΔE 28.5Midnight blue · ΔE 29.5Rebecca purple · ΔE 37.1Cornflower blue · ΔE 37.4Slate grey · ΔE 37.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.44, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#775018
Analogous#186F77, #211877
Triadic#77183F, #3F7718
Split complementary#772018, #6F7718
Tetradic#77186E, #775018, #187720

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#77A4E4
Lighter +30%#4D87DB
Lighter +20%#296CCC
Lighter +10%#2155A1
Darker −10%#0F294D
Darker −20%#071222
Darker −30%#000000
Darker −40%#000000
More saturated +25%#063C89
Less saturated −25%#2A4265

Channel breakdown

R24
G63
B119
Red24 (9.4%)
Green63 (24.7%)
Blue119 (46.7%)
Hue215.37°
Saturation (HSL)66.43%
Lightness28.04%
Dominant channelBlue
Hex per channelR 18 · G 3F · B 77

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Every value on this page was computed from “183f77” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.