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Recognised as Colour

#173B7D

  • #173B7D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173B7D is a blue with RGB values 23, 59, 125 and HSL 219°, 69%, 29%. 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

#173B7D#173B7D
HEX#173B7D
RGBrgb(23, 59, 125)
RGB (0–1)0.0902, 0.2314, 0.4902
RGB percentages9%, 23.1%, 49%
HSLhsl(218.8, 68.9%, 29%)
HSV / HSBhsv(218.8, 81.6%, 49%)
CMYK81.6%, 52.8%, 0%, 51%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,557
CSS custom property--colour: #173B7D;

Brightness & contrast

Relative luminance0.04791WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.72:1
Contrast with white10.72:1WCAG normal text: AAA
Contrast with black1.96:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E8C482

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#10437Fno red cones; affects about 1% of men; ΔE 6.5 from the original
Deuteranopia#00397Cno green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#004B56no blue cones; rare, and affects men and women equally; ΔE 40.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.72:1WCAG large text: AAA
Contrast with black, large text1.96:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 13.7Midnight blue · ΔE 22.8Rebecca purple · ΔE 31.1Steel blue · ΔE 32.7Slate blue · ΔE 34.2Royal blue · ΔE 35
Nearest named CSS colourDark slateblue (#483D8B)ΔE 13.74, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7D5917
Analogous#176E7D, #26177D
Triadic#7D173B, #3B7D17
Split complementary#7D2617, #6E7D17
Tetradic#7D176E, #7D5917, #177D26

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7AA0E6
Lighter +30%#4E81DF
Lighter +20%#2764D3
Lighter +10%#1F4FA8
Darker −10%#0F2752
Darker −20%#071227
Darker −30%#000000
Darker −40%#000000
More saturated +25%#043690
Less saturated −25%#29406A

Channel breakdown

R23
G59
B125
Red23 (9%)
Green59 (23.1%)
Blue125 (49%)
Hue218.82°
Saturation (HSL)68.92%
Lightness29.02%
Dominant channelBlue
Hex per channelR 17 · G 3B · B 7D

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Every value on this page was computed from “173b7d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.