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Recognised as Colour

#183A98

  • #183A98
  • Blue
  • Dark
  • Nearest: Dark slateblue

#183A98 is a blue with RGB values 24, 58, 152 and HSL 224°, 73%, 35%. It is a dark colour, so white text on it reaches 10:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#183A98#183A98
HEX#183A98
RGBrgb(24, 58, 152)
RGB (0–1)0.0941, 0.2275, 0.5961
RGB percentages9.4%, 22.7%, 59.6%
HSLhsl(224.1, 72.7%, 34.5%)
HSV / HSBhsv(224.1, 84.2%, 59.6%)
CMYK84.2%, 61.8%, 0%, 40.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,587,864
CSS custom property--colour: #183A98;

Brightness & contrast

Relative luminance0.05487WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.01:1
Contrast with white10.01:1WCAG normal text: AAA
Contrast with black2.1:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E7C567

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00489Bno red cones; affects about 1% of men; ΔE 11.3 from the original
Deuteranopia#003C96no green cones; the most common form, about 1% of men; ΔE 3.7 from the original
Tritanopia#005263no blue cones; rare, and affects men and women equally; ΔE 55.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.01:1WCAG large text: AAA
Contrast with black, large text2.1:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12.9Midnight blue · ΔE 14.8Rebecca purple · ΔE 20Slate blue · ΔE 20.7Royal blue · ΔE 22.5Indigo · ΔE 27.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.92, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#987618
Analogous#187A98, #361898
Triadic#98183A, #3A9818
Split complementary#983618, #7A9818
Tetradic#98187A, #987618, #189836

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8FA8ED
Lighter +30%#6386E6
Lighter +20%#3763DF
Lighter +10%#1F4BC4
Darker −10%#11296C
Darker −20%#0A1840
Darker −30%#030814
Darker −40%#000000
More saturated +25%#0230AE
Less saturated −25%#2E4482

Channel breakdown

R24
G58
B152
Red24 (9.4%)
Green58 (22.7%)
Blue152 (59.6%)
Hue224.06°
Saturation (HSL)72.73%
Lightness34.51%
Dominant channelBlue
Hex per channelR 18 · G 3A · B 98

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Every value on this page was computed from “183a98” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.