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Colour

#173A6D

  • #173A6D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173A6D is a blue with RGB values 23, 58, 109 and HSL 216°, 65%, 26%. It is a dark colour, so white text on it reaches 11.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173A6D#173A6D
HEX#173A6D
RGBrgb(23, 58, 109)
RGB (0–1)0.0902, 0.2275, 0.4275
RGB percentages9%, 22.7%, 42.7%
HSLhsl(215.6, 65.2%, 25.9%)
HSV / HSBhsv(215.6, 78.9%, 42.7%)
CMYK78.9%, 46.8%, 0%, 57.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,285
CSS custom property--colour: #173A6D;

Brightness & contrast

Relative luminance0.04312WCAG 2.x, 0 is black and 1 is white
Perceived brightness59.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.28:1
Contrast with white11.28:1WCAG normal text: AAA
Contrast with black1.86:1WCAG normal text: Fail
Greyscale equivalent#363636
Inverted#E8C592

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#203F6Fno red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#0F376Cno green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#00464Eno blue cones; rare, and affects men and women equally; ΔE 32.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.28:1WCAG large text: AAA
Contrast with black, large text1.86:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 21.7Steel blue · ΔE 30Midnight blue · ΔE 30.7Dark slate grey · ΔE 35.7Slate grey · ΔE 37.4Rebecca purple · ΔE 39.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 21.68, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#6D4A17
Analogous#17656D, #1F176D
Triadic#6D173A, #3A6D17
Split complementary#6D1F17, #656D17
Tetradic#6D1765, #6D4A17, #176D1F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6F9DE1
Lighter +30%#4581D8
Lighter +20%#2967C1
Lighter +10%#205097
Darker −10%#0E2443
Darker −20%#050D19
Darker −30%#000000
Darker −40%#000000
More saturated +25%#06377E
Less saturated −25%#273D5C

Channel breakdown

R23
G58
B109
Red23 (9%)
Green58 (22.7%)
Blue109 (42.7%)
Hue215.58°
Saturation (HSL)65.15%
Lightness25.88%
Dominant channelBlue
Hex per channelR 17 · G 3A · B 6D

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Every value on this page was computed from “173a6d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.