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Recognised as Colour

#173F71

  • #173F71
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173F71 is a blue with RGB values 23, 63, 113 and HSL 213°, 66%, 27%. It is a dark colour, so white text on it reaches 10.6:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173F71#173F71
HEX#173F71
RGBrgb(23, 63, 113)
RGB (0–1)0.0902, 0.2471, 0.4431
RGB percentages9%, 24.7%, 44.3%
HSLhsl(213.3, 66.2%, 26.7%)
HSV / HSBhsv(213.3, 79.6%, 44.3%)
CMYK79.6%, 44.2%, 0%, 55.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,569
CSS custom property--colour: #173F71;

Brightness & contrast

Relative luminance0.04929WCAG 2.x, 0 is black and 1 is white
Perceived brightness62.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.57:1
Contrast with white10.57:1WCAG normal text: AAA
Contrast with black1.99:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E8C08E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#264373no red cones; affects about 1% of men; ΔE 2.9 from the original
Deuteranopia#163B70no green cones; the most common form, about 1% of men; ΔE 3.1 from the original
Tritanopia#004B52no blue cones; rare, and affects men and women equally; ΔE 32.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.57:1WCAG large text: AAA
Contrast with black, large text1.99:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 23Steel blue · ΔE 27.6Midnight blue · ΔE 33Dark slate grey · ΔE 34.1Slate grey · ΔE 35.3Light slate grey · ΔE 37.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 23.02, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#714917
Analogous#176C71, #1C1771
Triadic#71173F, #3F7117
Split complementary#711C17, #6C7117
Tetradic#71176C, #714917, #17711C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#72A4E2
Lighter +30%#4788DA
Lighter +20%#286EC6
Lighter +10%#20579B
Darker −10%#0E2747
Darker −20%#06101C
Darker −30%#000000
Darker −40%#000000
More saturated +25%#063D82
Less saturated −25%#284160

Channel breakdown

R23
G63
B113
Red23 (9%)
Green63 (24.7%)
Blue113 (44.3%)
Hue213.33°
Saturation (HSL)66.18%
Lightness26.67%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 71

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Every value on this page was computed from “173f71” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.