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Recognised as Colour

#173F79

  • #173F79
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173F79 is a blue with RGB values 23, 63, 121 and HSL 216°, 68%, 28%. It is a dark colour, so white text on it reaches 10.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173F79#173F79
HEX#173F79
RGBrgb(23, 63, 121)
RGB (0–1)0.0902, 0.2471, 0.4745
RGB percentages9%, 24.7%, 47.5%
HSLhsl(215.5, 68.1%, 28.2%)
HSV / HSBhsv(215.5, 81%, 47.5%)
CMYK81%, 47.9%, 0%, 52.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,577
CSS custom property--colour: #173F79;

Brightness & contrast

Relative luminance0.05118WCAG 2.x, 0 is black and 1 is white
Perceived brightness64.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.38:1
Contrast with white10.38:1WCAG normal text: AAA
Contrast with black2.02:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#E8C086

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#20457Bno red cones; affects about 1% of men; ΔE 4 from the original
Deuteranopia#083C78no green cones; the most common form, about 1% of men; ΔE 2.2 from the original
Tritanopia#004D56no blue cones; rare, and affects men and women equally; ΔE 36.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.38:1WCAG large text: AAA
Contrast with black, large text2.02:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 18.4Midnight blue · ΔE 28.5Steel blue · ΔE 28.9Rebecca purple · ΔE 36.1Cornflower blue · ΔE 36.9Slate grey · ΔE 38.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 18.44, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#795117
Analogous#177079, #201779
Triadic#79173F, #3F7917
Split complementary#792017, #707917
Tetradic#791770, #795117, #177920

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#77A4E5
Lighter +30%#4C87DD
Lighter +20%#276CCF
Lighter +10%#1F55A4
Darker −10%#0F294E
Darker −20%#071223
Darker −30%#000000
Darker −40%#000000
More saturated +25%#053C8B
Less saturated −25%#294267

Channel breakdown

R23
G63
B121
Red23 (9%)
Green63 (24.7%)
Blue121 (47.5%)
Hue215.51°
Saturation (HSL)68.06%
Lightness28.24%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 79

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Every value on this page was computed from “173f79” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.