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Recognised as Colour

#173D74

  • #173D74
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173D74 is a blue with RGB values 23, 61, 116 and HSL 215°, 67%, 27%. It is a dark colour, so white text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173D74#173D74
HEX#173D74
RGBrgb(23, 61, 116)
RGB (0–1)0.0902, 0.2392, 0.4549
RGB percentages9%, 23.9%, 45.5%
HSLhsl(215.5, 66.9%, 27.3%)
HSV / HSBhsv(215.5, 80.2%, 45.5%)
CMYK80.2%, 47.4%, 0%, 54.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,060
CSS custom property--colour: #173D74;

Brightness & contrast

Relative luminance0.04781WCAG 2.x, 0 is black and 1 is white
Perceived brightness62.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.74:1
Contrast with white10.74:1WCAG normal text: AAA
Contrast with black1.96:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#E8C28B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#204276no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#0B3A73no green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#004A52no blue cones; rare, and affects men and women equally; ΔE 35.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.74:1WCAG large text: AAA
Contrast with black, large text1.96:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.8Steel blue · ΔE 29.2Midnight blue · ΔE 29.4Rebecca purple · ΔE 37.4Dark slate grey · ΔE 37.7Slate grey · ΔE 37.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.77, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#744E17
Analogous#176B74, #201774
Triadic#74173D, #3D7417
Split complementary#742017, #6B7417
Tetradic#74176B, #744E17, #177420

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#74A1E3
Lighter +30%#4985DB
Lighter +20%#286AC9
Lighter +10%#1F539F
Darker −10%#0F2749
Darker −20%#06101F
Darker −30%#000000
Darker −40%#000000
More saturated +25%#063A85
Less saturated −25%#284063

Channel breakdown

R23
G61
B116
Red23 (9%)
Green61 (23.9%)
Blue116 (45.5%)
Hue215.48°
Saturation (HSL)66.91%
Lightness27.25%
Dominant channelBlue
Hex per channelR 17 · G 3D · B 74

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Every value on this page was computed from “173d74” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.