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Colour

#173B59

  • #173B59
  • Blue
  • Dark
  • Nearest: Dark slate grey

#173B59 is a blue with RGB values 23, 59, 89 and HSL 207°, 59%, 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

#173B59#173B59
HEX#173B59
RGBrgb(23, 59, 89)
RGB (0–1)0.0902, 0.2314, 0.349
RGB percentages9%, 23.1%, 34.9%
HSLhsl(207.3, 58.9%, 22%)
HSV / HSBhsv(207.3, 74.2%, 34.9%)
CMYK74.2%, 33.7%, 0%, 65.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,521
CSS custom property--colour: #173B59;

Brightness & contrast

Relative luminance0.04031WCAG 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#E8C4A6

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2E3C5Ano red cones; affects about 1% of men; ΔE 5.8 from the original
Deuteranopia#243658no green cones; the most common form, about 1% of men; ΔE 6.1 from the original
Tritanopia#004246no blue cones; rare, and affects men and women equally; ΔE 20.6 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 22Dim grey · ΔE 30Steel blue · ΔE 30.6Slate grey · ΔE 31.1Black · ΔE 32.3Light slate grey · ΔE 33.9
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 21.95, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#593517
Analogous#175956, #171A59
Triadic#59173B, #3B5917
Split complementary#59171A, #595617
Tetradic#561759, #593517, #1A5917

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#65A3D7
Lighter +30%#3C8BCD
Lighter +20%#2C71AA
Lighter +10%#215682
Darker −10%#0D2030
Darker −20%#020508
Darker −30%#000000
Darker −40%#000000
More saturated +25%#093C67
Less saturated −25%#253A4B

Channel breakdown

R23
G59
B89
Red23 (9%)
Green59 (23.1%)
Blue89 (34.9%)
Hue207.27°
Saturation (HSL)58.93%
Lightness21.96%
Dominant channelBlue
Hex per channelR 17 · G 3B · B 59

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Every value on this page was computed from “173b59” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.