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Recognised as Colour

#173F78

  • #173F78
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173F78 is a blue with RGB values 23, 63, 120 and HSL 215°, 68%, 28%. It is a dark colour, so white text on it reaches 10.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173F78#173F78
HEX#173F78
RGBrgb(23, 63, 120)
RGB (0–1)0.0902, 0.2471, 0.4706
RGB percentages9%, 24.7%, 47.1%
HSLhsl(215.3, 67.8%, 28%)
HSV / HSBhsv(215.3, 80.8%, 47.1%)
CMYK80.8%, 47.5%, 0%, 52.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,576
CSS custom property--colour: #173F78;

Brightness & contrast

Relative luminance0.05093WCAG 2.x, 0 is black and 1 is white
Perceived brightness64.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.4:1
Contrast with white10.4:1WCAG normal text: AAA
Contrast with black2.02:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#E8C087

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#21457Ano red cones; affects about 1% of men; ΔE 4 from the original
Deuteranopia#0A3C77no green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#004D55no blue cones; rare, and affects men and women equally; ΔE 36.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.4:1WCAG large text: AAA
Contrast with black, large text2.02:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19Steel blue · ΔE 28.6Midnight blue · ΔE 29Rebecca purple · ΔE 36.7Cornflower blue · ΔE 37.2Slate grey · ΔE 38.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 18.99, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#785017
Analogous#177078, #1F1778
Triadic#78173F, #3F7817
Split complementary#781F17, #707817
Tetradic#781770, #785017, #17781F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#76A4E5
Lighter +30%#4B87DD
Lighter +20%#276CCE
Lighter +10%#1F55A3
Darker −10%#0F294D
Darker −20%#071222
Darker −30%#000000
Darker −40%#000000
More saturated +25%#053C8A
Less saturated −25%#294266

Channel breakdown

R23
G63
B120
Red23 (9%)
Green63 (24.7%)
Blue120 (47.1%)
Hue215.26°
Saturation (HSL)67.83%
Lightness28.04%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 78

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Every value on this page was computed from “173f78” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.