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Recognised as Colour

#173D73

  • #173D73
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173D73 is a blue with RGB values 23, 61, 115 and HSL 215°, 67%, 27%. It is a dark colour, so white text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173D73#173D73
HEX#173D73
RGBrgb(23, 61, 115)
RGB (0–1)0.0902, 0.2392, 0.451
RGB percentages9%, 23.9%, 45.1%
HSLhsl(215.2, 66.7%, 27.1%)
HSV / HSBhsv(215.2, 80%, 45.1%)
CMYK80%, 47%, 0%, 54.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,059
CSS custom property--colour: #173D73;

Brightness & contrast

Relative luminance0.04757WCAG 2.x, 0 is black and 1 is white
Perceived brightness62 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.76:1
Contrast with white10.76:1WCAG normal text: AAA
Contrast with black1.95:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#E8C28C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#214275no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#0E3A72no green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#004A52no blue cones; rare, and affects men and women equally; ΔE 34.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.76:1WCAG large text: AAA
Contrast with black, large text1.95:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 20.3Steel blue · ΔE 29Midnight blue · ΔE 30Dark slate grey · ΔE 37.1Slate grey · ΔE 37.5Rebecca purple · ΔE 38
Nearest named CSS colourDark slateblue (#483D8B)ΔE 20.35, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#734D17
Analogous#176B73, #1F1773
Triadic#73173D, #3D7317
Split complementary#731F17, #6B7317
Tetradic#73176B, #734D17, #17731F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#73A1E3
Lighter +30%#4985DB
Lighter +20%#286AC8
Lighter +10%#1F549E
Darker −10%#0E2649
Darker −20%#06101E
Darker −30%#000000
Darker −40%#000000
More saturated +25%#063A84
Less saturated −25%#284062

Channel breakdown

R23
G61
B115
Red23 (9%)
Green61 (23.9%)
Blue115 (45.1%)
Hue215.22°
Saturation (HSL)66.67%
Lightness27.06%
Dominant channelBlue
Hex per channelR 17 · G 3D · B 73

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Every value on this page was computed from “173d73” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.