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Recognised as Colour

#183B58

  • #183B58
  • Blue
  • Dark
  • Nearest: Dark slate grey

#183B58 is a blue with RGB values 24, 59, 88 and HSL 207°, 57%, 22%. It is a dark colour, so white text on it reaches 11.6:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#183B58#183B58
HEX#183B58
RGBrgb(24, 59, 88)
RGB (0–1)0.0941, 0.2314, 0.3451
RGB percentages9.4%, 23.1%, 34.5%
HSLhsl(207.2, 57.1%, 22%)
HSV / HSBhsv(207.2, 72.7%, 34.5%)
CMYK72.7%, 33%, 0%, 65.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,056
CSS custom property--colour: #183B58;

Brightness & contrast

Relative luminance0.04027WCAG 2.x, 0 is black and 1 is white
Perceived brightness55.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.63:1
Contrast with white11.63:1WCAG normal text: AAA
Contrast with black1.81:1WCAG normal text: Fail
Greyscale equivalent#363636
Inverted#E7C4A7

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2E3C59no red cones; affects about 1% of men; ΔE 5.7 from the original
Deuteranopia#253657no green cones; the most common form, about 1% of men; ΔE 6.1 from the original
Tritanopia#004245no blue cones; rare, and affects men and women equally; ΔE 20.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.63:1WCAG large text: AAA
Contrast with black, large text1.81:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 21.3Dim grey · ΔE 29.6Steel blue · ΔE 30.8Slate grey · ΔE 30.9Black · ΔE 31.8Light slate grey · ΔE 33.7
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 21.34, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#583518
Analogous#185855, #181B58
Triadic#58183B, #3B5818
Split complementary#58181B, #585518
Tetradic#551858, #583518, #1B5818

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#67A3D5
Lighter +30%#3F8BCB
Lighter +20%#2E71A8
Lighter +10%#235680
Darker −10%#0D2030
Darker −20%#020508
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A3C66
Less saturated −25%#263A4A

Channel breakdown

R24
G59
B88
Red24 (9.4%)
Green59 (23.1%)
Blue88 (34.5%)
Hue207.19°
Saturation (HSL)57.14%
Lightness21.96%
Dominant channelBlue
Hex per channelR 18 · G 3B · B 58

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Every value on this page was computed from “183b58” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.