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Recognised as Colour

#173DBD

  • #173DBD
  • Blue
  • Dark
  • Nearest: Slate blue

#173DBD is a blue with RGB values 23, 61, 189 and HSL 226°, 78%, 42%. It is a dark colour, so white text on it reaches 8.6:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#173DBD#173DBD
HEX#173DBD
RGBrgb(23, 61, 189)
RGB (0–1)0.0902, 0.2392, 0.7412
RGB percentages9%, 23.9%, 74.1%
HSLhsl(226.3, 78.3%, 41.6%)
HSV / HSBhsv(226.3, 87.8%, 74.1%)
CMYK87.8%, 67.7%, 0%, 25.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,133
CSS custom property--colour: #173DBD;

Brightness & contrast

Relative luminance0.07194WCAG 2.x, 0 is black and 1 is white
Perceived brightness80.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.61:1
Contrast with white8.61:1WCAG normal text: AAA
Contrast with black2.44:1WCAG normal text: Fail
Greyscale equivalent#3E3E3E
Inverted#E8C242

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0054C1no red cones; affects about 1% of men; ΔE 17.3 from the original
Deuteranopia#0044BBno green cones; the most common form, about 1% of men; ΔE 7 from the original
Tritanopia#006078no blue cones; rare, and affects men and women equally; ΔE 72.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.61:1WCAG large text: AAA
Contrast with black, large text2.44:1WCAG large text: Fail

Named colours

Slate blue · ΔE 18Royal blue · ΔE 19.6Medium slateblue · ΔE 20.8Dark blue · ΔE 21.9Navy · ΔE 22.5Rebecca purple · ΔE 23.6
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 17.97, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BD9717
Analogous#1790BD, #4417BD
Triadic#BD173D, #3DBD17
Split complementary#BD4417, #90BD17
Tetradic#BD1790, #BD9717, #17BD44

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#ABBCF5
Lighter +30%#7E98EF
Lighter +20%#5073EA
Lighter +10%#234FE4
Darker −10%#112E90
Darker −20%#0C2062
Darker −30%#061135
Darker −40%#010207
More saturated +25%#0031D4
Less saturated −25%#324BA3

Channel breakdown

R23
G61
B189
Red23 (9%)
Green61 (23.9%)
Blue189 (74.1%)
Hue226.27°
Saturation (HSL)78.3%
Lightness41.57%
Dominant channelBlue
Hex per channelR 17 · G 3D · B BD

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