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Colour

#183D64

  • #183D64
  • Blue
  • Dark
  • Nearest: Dark slate grey

#183D64 is a blue with RGB values 24, 61, 100 and HSL 211°, 61%, 24%. It is a dark colour, so white text on it reaches 11.1:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#183D64#183D64
HEX#183D64
RGBrgb(24, 61, 100)
RGB (0–1)0.0941, 0.2392, 0.3922
RGB percentages9.4%, 23.9%, 39.2%
HSLhsl(210.8, 61.3%, 24.3%)
HSV / HSBhsv(210.8, 76%, 39.2%)
CMYK76%, 39%, 0%, 60.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,580
CSS custom property--colour: #183D64;

Brightness & contrast

Relative luminance0.04452WCAG 2.x, 0 is black and 1 is white
Perceived brightness59.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.11:1
Contrast with white11.11:1WCAG normal text: AAA
Contrast with black1.89:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E7C29B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2B3F66no red cones; affects about 1% of men; ΔE 4 from the original
Deuteranopia#203863no green cones; the most common form, about 1% of men; ΔE 4.9 from the original
Tritanopia#00464Bno blue cones; rare, and affects men and women equally; ΔE 26.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.11:1WCAG large text: AAA
Contrast with black, large text1.89:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 27.3Steel blue · ΔE 28.4Dark slateblue · ΔE 29.4Slate grey · ΔE 32.3Dim grey · ΔE 33.1Light slate grey · ΔE 34.8
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 27.33, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#643F18
Analogous#186364, #191864
Triadic#64183D, #3D6418
Split complementary#641918, #636418
Tetradic#641863, #643F18, #186419

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6CA3DC
Lighter +30%#4389D2
Lighter +20%#2C6FB6
Lighter +10%#22568D
Darker −10%#0E243B
Darker −20%#040B12
Darker −30%#000000
Darker −40%#000000
More saturated +25%#083D74
Less saturated −25%#283D54

Channel breakdown

R24
G61
B100
Red24 (9.4%)
Green61 (23.9%)
Blue100 (39.2%)
Hue210.79°
Saturation (HSL)61.29%
Lightness24.31%
Dominant channelBlue
Hex per channelR 18 · G 3D · B 64

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Every value on this page was computed from “183d64” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.