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Colour

#182A51

  • #182A51
  • Blue
  • Dark
  • Nearest: Dark slateblue

#182A51 is a blue with RGB values 24, 42, 81 and HSL 221°, 54%, 21%. It is a dark colour, so white text on it reaches 14.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#182A51#182A51
HEX#182A51
RGBrgb(24, 42, 81)
RGB (0–1)0.0941, 0.1647, 0.3176
RGB percentages9.4%, 16.5%, 31.8%
HSLhsl(221.1, 54.3%, 20.6%)
HSV / HSBhsv(221.1, 70.4%, 31.8%)
CMYK70.4%, 48.1%, 0%, 68.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,583,697
CSS custom property--colour: #182A51;

Brightness & contrast

Relative luminance0.02444WCAG 2.x, 0 is black and 1 is white
Perceived brightness44.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 14.1:1
Contrast with white14.1:1WCAG normal text: AAA
Contrast with black1.49:1WCAG normal text: Fail
Greyscale equivalent#292929
Inverted#E7D5AE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#182E52no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#0E2950no green cones; the most common form, about 1% of men; ΔE 1.9 from the original
Tritanopia#003339no blue cones; rare, and affects men and women equally; ΔE 27.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text14.1:1WCAG large text: AAA
Contrast with black, large text1.49:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 28Dark slate grey · ΔE 32.4Black · ΔE 32.4Midnight blue · ΔE 33.9Steel blue · ΔE 37.1Dim grey · ΔE 38.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 27.95, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#513F18
Analogous#184651, #231851
Triadic#51182A, #2A5118
Split complementary#512318, #465118
Tetradic#511846, #513F18, #185123

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6486D1
Lighter +30%#3D68C5
Lighter +20%#2F53A0
Lighter +10%#243E78
Darker −10%#0C162A
Darker −20%#010102
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0B255E
Less saturated −25%#252F44

Channel breakdown

R24
G42
B81
Red24 (9.4%)
Green42 (16.5%)
Blue81 (31.8%)
Hue221.05°
Saturation (HSL)54.29%
Lightness20.59%
Dominant channelBlue
Hex per channelR 18 · G 2A · B 51

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Every value on this page was computed from “182a51” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.