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Colour

#173F58

  • #173F58
  • Blue
  • Dark
  • Nearest: Dark slate grey

#173F58 is a blue with RGB values 23, 63, 88 and HSL 203°, 59%, 22%. 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

#173F58#173F58
HEX#173F58
RGBrgb(23, 63, 88)
RGB (0–1)0.0902, 0.2471, 0.3451
RGB percentages9%, 24.7%, 34.5%
HSLhsl(203.1, 58.6%, 21.8%)
HSV / HSBhsv(203.1, 73.9%, 34.5%)
CMYK73.9%, 28.4%, 0%, 65.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,544
CSS custom property--colour: #173F58;

Brightness & contrast

Relative luminance0.04442WCAG 2.x, 0 is black and 1 is white
Perceived brightness58.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.12:1
Contrast with white11.12:1WCAG normal text: AAA
Contrast with black1.89:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E8C0A7

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#333F59no red cones; affects about 1% of men; ΔE 7.9 from the original
Deuteranopia#2B3958no green cones; the most common form, about 1% of men; ΔE 8.9 from the original
Tritanopia#004548no blue cones; rare, and affects men and women equally; ΔE 17.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.12:1WCAG large text: AAA
Contrast with black, large text1.89:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 17.9Dim grey · ΔE 27.6Slate grey · ΔE 29.1Steel blue · ΔE 30.4Black · ΔE 31.9Light slate grey · ΔE 31.9
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 17.94, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#583017
Analogous#175851, #171E58
Triadic#58173F, #3F5817
Split complementary#58171E, #585117
Tetradic#511758, #583017, #1E5817

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#64ABD7
Lighter +30%#3C95CC
Lighter +20%#2C79A9
Lighter +10%#225C80
Darker −10%#0C2230
Darker −20%#020507
Darker −30%#000000
Darker −40%#000000
More saturated +25%#094266
Less saturated −25%#253C4A

Channel breakdown

R23
G63
B88
Red23 (9%)
Green63 (24.7%)
Blue88 (34.5%)
Hue203.08°
Saturation (HSL)58.56%
Lightness21.76%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 58

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Every value on this page was computed from “173f58” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.