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Recognised as Colour

#173E9F

  • #173E9F
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173E9F is a blue with RGB values 23, 62, 159 and HSL 223°, 75%, 36%. It is a dark colour, so white text on it reaches 9.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173E9F#173E9F
HEX#173E9F
RGBrgb(23, 62, 159)
RGB (0–1)0.0902, 0.2431, 0.6235
RGB percentages9%, 24.3%, 62.4%
HSLhsl(222.8, 74.7%, 35.7%)
HSV / HSBhsv(222.8, 85.5%, 62.4%)
CMYK85.5%, 61%, 0%, 37.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,359
CSS custom property--colour: #173E9F;

Brightness & contrast

Relative luminance0.06131WCAG 2.x, 0 is black and 1 is white
Perceived brightness72.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.43:1
Contrast with white9.43:1WCAG normal text: AAA
Contrast with black2.23:1WCAG normal text: Fail
Greyscale equivalent#3D3D3D
Inverted#E8C160

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004DA2no red cones; affects about 1% of men; ΔE 12.1 from the original
Deuteranopia#00409Dno green cones; the most common form, about 1% of men; ΔE 3.6 from the original
Tritanopia#005768no blue cones; rare, and affects men and women equally; ΔE 57.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.43:1WCAG large text: AAA
Contrast with black, large text2.23:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 14.2Midnight blue · ΔE 16.8Slate blue · ΔE 19.2Royal blue · ΔE 20.3Rebecca purple · ΔE 20.3Indigo · ΔE 28.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 14.21, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9F7817
Analogous#17829F, #34179F
Triadic#9F173E, #3E9F17
Split complementary#9F3417, #829F17
Tetradic#9F1782, #9F7817, #179F34

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#93ADEF
Lighter +30%#668CE9
Lighter +20%#3A6AE2
Lighter +10%#1D4FCC
Darker −10%#112D72
Darker −20%#0A1B46
Darker −30%#040A19
Darker −40%#000000
More saturated +25%#0034B6
Less saturated −25%#2E4888

Channel breakdown

R23
G62
B159
Red23 (9%)
Green62 (24.3%)
Blue159 (62.4%)
Hue222.79°
Saturation (HSL)74.73%
Lightness35.69%
Dominant channelBlue
Hex per channelR 17 · G 3E · B 9F

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Every value on this page was computed from “173e9f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.