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Colour

#183F4E

  • #183F4E
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#183F4E is a cyan with RGB values 24, 63, 78 and HSL 197°, 53%, 20%. It is a dark colour, so white text on it reaches 11.3:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#183F4E#183F4E
HEX#183F4E
RGBrgb(24, 63, 78)
RGB (0–1)0.0941, 0.2471, 0.3059
RGB percentages9.4%, 24.7%, 30.6%
HSLhsl(196.7, 52.9%, 20%)
HSV / HSBhsv(196.7, 69.2%, 30.6%)
CMYK69.2%, 19.2%, 0%, 69.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,589,070
CSS custom property--colour: #183F4E;

Brightness & contrast

Relative luminance0.04299WCAG 2.x, 0 is black and 1 is white
Perceived brightness56.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.29:1
Contrast with white11.29:1WCAG normal text: AAA
Contrast with black1.86:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E7C0B1

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#373E4Fno red cones; affects about 1% of men; ΔE 10.3 from the original
Deuteranopia#2F384Eno green cones; the most common form, about 1% of men; ΔE 11.1 from the original
Tritanopia#004344no blue cones; rare, and affects men and women equally; ΔE 12.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.29:1WCAG large text: AAA
Contrast with black, large text1.86:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 12Dim grey · ΔE 25.2Slate grey · ΔE 29Black · ΔE 29.2Teal · ΔE 31.6Light slate grey · ΔE 31.9
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 12.02, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4E2718
Analogous#184E42, #18244E
Triadic#4E183F, #3F4E18
Split complementary#4E1824, #4E4218
Tetradic#42184E, #4E2718, #244E18

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#63B1CF
Lighter +30%#3C9EC3
Lighter +20%#307E9C
Lighter +10%#245F75
Darker −10%#0C2027
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0B455B
Less saturated −25%#253941

Channel breakdown

R24
G63
B78
Red24 (9.4%)
Green63 (24.7%)
Blue78 (30.6%)
Hue196.67°
Saturation (HSL)52.94%
Lightness20%
Dominant channelBlue
Hex per channelR 18 · G 3F · B 4E

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Every value on this page was computed from “183f4e” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.