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Colour

#181F45

  • #181F45
  • Blue
  • Dark
  • Nearest: Dark slateblue

#181F45 is a blue with RGB values 24, 31, 69 and HSL 231°, 48%, 18%. It is a dark colour, so white text on it reaches 15.9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#181F45#181F45
HEX#181F45
RGBrgb(24, 31, 69)
RGB (0–1)0.0941, 0.1216, 0.2706
RGB percentages9.4%, 12.2%, 27.1%
HSLhsl(230.7, 48.4%, 18.2%)
HSV / HSBhsv(230.7, 65.2%, 27.1%)
CMYK65.2%, 55.1%, 0%, 72.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,580,869
CSS custom property--colour: #181F45;

Brightness & contrast

Relative luminance0.01604WCAG 2.x, 0 is black and 1 is white
Perceived brightness35.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.9:1
Contrast with white15.9:1WCAG normal text: AAA
Contrast with black1.32:1WCAG normal text: Fail
Greyscale equivalent#202020
Inverted#E7E0BA

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0C2446no red cones; affects about 1% of men; ΔE 5.9 from the original
Deuteranopia#052044no green cones; the most common form, about 1% of men; ΔE 4.8 from the original
Tritanopia#00282Eno blue cones; rare, and affects men and women equally; ΔE 27.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.9:1WCAG large text: AAA
Contrast with black, large text1.32:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 29Black · ΔE 30.2Midnight blue · ΔE 32.5Dark slate grey · ΔE 35.7Dim grey · ΔE 41.3Steel blue · ΔE 42.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 29.01, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#453E18
Analogous#183545, #281845
Triadic#45181F, #1F4518
Split complementary#452818, #354518
Tetradic#451835, #453E18, #184528

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6171C8
Lighter +30%#3F52B7
Lighter +20%#324191
Lighter +10%#25306B
Darker −10%#0B0E1F
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0C1751
Less saturated −25%#242739

Channel breakdown

R24
G31
B69
Red24 (9.4%)
Green31 (12.2%)
Blue69 (27.1%)
Hue230.67°
Saturation (HSL)48.39%
Lightness18.24%
Dominant channelBlue
Hex per channelR 18 · G 1F · B 45

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Every value on this page was computed from “181f45” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.