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Recognised as Colour

#173A39

  • #173A39
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#173A39 is a cyan with RGB values 23, 58, 57 and HSL 178°, 43%, 16%. It is a dark colour, so white text on it reaches 12.3:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#173A39#173A39
HEX#173A39
RGBrgb(23, 58, 57)
RGB (0–1)0.0902, 0.2275, 0.2235
RGB percentages9%, 22.7%, 22.4%
HSLhsl(178.3, 43.2%, 15.9%)
HSV / HSBhsv(178.3, 60.3%, 22.7%)
CMYK60.3%, 0%, 1.7%, 77.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,233
CSS custom property--colour: #173A39;

Brightness & contrast

Relative luminance0.03504WCAG 2.x, 0 is black and 1 is white
Perceived brightness50 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.35:1
Contrast with white12.35:1WCAG normal text: AAA
Contrast with black1.7:1WCAG normal text: Fail
Greyscale equivalent#323232
Inverted#E8C5C6

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#363739no red cones; affects about 1% of men; ΔE 13.1 from the original
Deuteranopia#313339no green cones; the most common form, about 1% of men; ΔE 13.5 from the original
Tritanopia#013C3Ano blue cones; rare, and affects men and women equally; ΔE 4.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text12.35:1WCAG large text: AAA
Contrast with black, large text1.7:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 9.4Black · ΔE 25.7Dim grey · ΔE 26.1Teal · ΔE 31.2Slate grey · ΔE 33.5Gray · ΔE 34.3
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 9.38, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3A1718
Analogous#173A27, #172A3A
Triadic#39173A, #3A3917
Split complementary#3A172A, #3A2717
Tetradic#27173A, #3A1718, #2A3A17

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#5EBFBC
Lighter +30%#42A8A5
Lighter +20%#348381
Lighter +10%#255F5D
Darker −10%#091515
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0D4443
Less saturated −25%#21302F

Channel breakdown

R23
G58
B57
Red23 (9%)
Green58 (22.7%)
Blue57 (22.4%)
Hue178.29°
Saturation (HSL)43.21%
Lightness15.88%
Dominant channelGreen
Hex per channelR 17 · G 3A · B 39

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Every value on this page was computed from “173a39” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.