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Recognised as Colour

#173F5A

  • #173F5A
  • Blue
  • Dark
  • Nearest: Dark slate grey

#173F5A is a blue with RGB values 23, 63, 90 and HSL 204°, 59%, 22%. It is a dark colour, so white text on it reaches 11.1:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#173F5A#173F5A
HEX#173F5A
RGBrgb(23, 63, 90)
RGB (0–1)0.0902, 0.2471, 0.3529
RGB percentages9%, 24.7%, 35.3%
HSLhsl(204.2, 59.3%, 22.2%)
HSV / HSBhsv(204.2, 74.4%, 35.3%)
CMYK74.4%, 30%, 0%, 64.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,546
CSS custom property--colour: #173F5A;

Brightness & contrast

Relative luminance0.04475WCAG 2.x, 0 is black and 1 is white
Perceived brightness58.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.08:1
Contrast with white11.08:1WCAG normal text: AAA
Contrast with black1.9:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E8C0A5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#333F5Bno red cones; affects about 1% of men; ΔE 7.7 from the original
Deuteranopia#29395Ano green cones; the most common form, about 1% of men; ΔE 8.4 from the original
Tritanopia#004648no blue cones; rare, and affects men and women equally; ΔE 19.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.08:1WCAG large text: AAA
Contrast with black, large text1.9:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 19.2Dim grey · ΔE 28.2Slate grey · ΔE 29.3Steel blue · ΔE 29.8Light slate grey · ΔE 32.1Black · ΔE 32.5
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 19.2, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5A3217
Analogous#175A53, #171E5A
Triadic#5A173F, #3F5A17
Split complementary#5A171E, #5A5317
Tetradic#53175A, #5A3217, #1E5A17

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#65AAD8
Lighter +30%#3D93CD
Lighter +20%#2C78AB
Lighter +10%#215B83
Darker −10%#0D2331
Darker −20%#020609
Darker −30%#000000
Darker −40%#000000
More saturated +25%#094268
Less saturated −25%#253C4C

Channel breakdown

R23
G63
B90
Red23 (9%)
Green63 (24.7%)
Blue90 (35.3%)
Hue204.18°
Saturation (HSL)59.29%
Lightness22.16%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 5A

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Every value on this page was computed from “173f5a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.