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Recognised as Colour

#172D77

  • #172D77
  • Blue
  • Dark
  • Nearest: Dark slateblue

#172D77 is a blue with RGB values 23, 45, 119 and HSL 226°, 68%, 28%. It is a dark colour, so white text on it reaches 12.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#172D77#172D77
HEX#172D77
RGBrgb(23, 45, 119)
RGB (0–1)0.0902, 0.1765, 0.4667
RGB percentages9%, 17.6%, 46.7%
HSLhsl(226.3, 67.6%, 27.8%)
HSV / HSBhsv(226.3, 80.7%, 46.7%)
CMYK80.7%, 62.2%, 0%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,518,967
CSS custom property--colour: #172D77;

Brightness & contrast

Relative luminance0.03391WCAG 2.x, 0 is black and 1 is white
Perceived brightness54.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.51:1
Contrast with white12.51:1WCAG normal text: AAA
Contrast with black1.68:1WCAG normal text: Fail
Greyscale equivalent#2E2E2E
Inverted#E8D288

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003879no red cones; affects about 1% of men; ΔE 9.9 from the original
Deuteranopia#002F76no green cones; the most common form, about 1% of men; ΔE 3.7 from the original
Tritanopia#00404Dno blue cones; rare, and affects men and women equally; ΔE 46.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text12.51:1WCAG large text: AAA
Contrast with black, large text1.68:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.1Midnight blue · ΔE 13.3Rebecca purple · ΔE 25.1Slate blue · ΔE 31.2Indigo · ΔE 32.2Royal blue · ΔE 33.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.07, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#776117
Analogous#175D77, #311777
Triadic#77172D, #2D7717
Split complementary#773117, #5D7717
Tetradic#77175D, #776117, #177731

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#768FE4
Lighter +30%#4B6CDC
Lighter +20%#284DCC
Lighter +10%#1F3DA2
Darker −10%#0F1D4C
Darker −20%#060D22
Darker −30%#000000
Darker −40%#000000
More saturated +25%#052389
Less saturated −25%#293765

Channel breakdown

R23
G45
B119
Red23 (9%)
Green45 (17.6%)
Blue119 (46.7%)
Hue226.25°
Saturation (HSL)67.61%
Lightness27.84%
Dominant channelBlue
Hex per channelR 17 · G 2D · B 77

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Every value on this page was computed from “172d77” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.