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Recognised as Colour

#173F73

  • #173F73
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173F73 is a blue with RGB values 23, 63, 115 and HSL 214°, 67%, 27%. It is a dark colour, so white text on it reaches 10.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173F73#173F73
HEX#173F73
RGBrgb(23, 63, 115)
RGB (0–1)0.0902, 0.2471, 0.451
RGB percentages9%, 24.7%, 45.1%
HSLhsl(213.9, 66.7%, 27.1%)
HSV / HSBhsv(213.9, 80%, 45.1%)
CMYK80%, 45.2%, 0%, 54.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,571
CSS custom property--colour: #173F73;

Brightness & contrast

Relative luminance0.04975WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.53:1
Contrast with white10.53:1WCAG normal text: AAA
Contrast with black1.99:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E8C08C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#254475no red cones; affects about 1% of men; ΔE 3.3 from the original
Deuteranopia#143B72no green cones; the most common form, about 1% of men; ΔE 3 from the original
Tritanopia#004B53no blue cones; rare, and affects men and women equally; ΔE 32.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.53:1WCAG large text: AAA
Contrast with black, large text1.99:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 21.8Steel blue · ΔE 27.8Midnight blue · ΔE 31.8Dark slate grey · ΔE 35.4Slate grey · ΔE 36.1Light slate grey · ΔE 38.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 21.84, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#734B17
Analogous#176D73, #1D1773
Triadic#73173F, #3F7317
Split complementary#731D17, #6D7317
Tetradic#73176D, #734B17, #17731D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#73A4E3
Lighter +30%#4988DB
Lighter +20%#286EC8
Lighter +10%#1F569E
Darker −10%#0E2849
Darker −20%#06101E
Darker −30%#000000
Darker −40%#000000
More saturated +25%#063D84
Less saturated −25%#284162

Channel breakdown

R23
G63
B115
Red23 (9%)
Green63 (24.7%)
Blue115 (45.1%)
Hue213.91°
Saturation (HSL)66.67%
Lightness27.06%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 73

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Every value on this page was computed from “173f73” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.