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Recognised as Colour

#171D97

  • #171D97
  • Blue
  • Dark
  • Nearest: Navy

#171D97 is a blue with RGB values 23, 29, 151 and HSL 237°, 74%, 34%. It is a dark colour, so white text on it reaches 12.7:1 contrast (AAA for normal text). The nearest named colour is Navy.

Colour values

#171D97#171D97
HEX#171D97
RGBrgb(23, 29, 151)
RGB (0–1)0.0902, 0.1137, 0.5922
RGB percentages9%, 11.4%, 59.2%
HSLhsl(237.2, 73.6%, 34.1%)
HSV / HSBhsv(237.2, 84.8%, 59.2%)
CMYK84.8%, 80.8%, 0%, 40.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,514,903
CSS custom property--colour: #171D97;

Brightness & contrast

Relative luminance0.03295WCAG 2.x, 0 is black and 1 is white
Perceived brightness57 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.66:1
Contrast with white12.66:1WCAG normal text: AAA
Contrast with black1.66:1WCAG normal text: Fail
Greyscale equivalent#252525
Inverted#E8E268

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00399Ano red cones; affects about 1% of men; ΔE 20.6 from the original
Deuteranopia#002C95no green cones; the most common form, about 1% of men; ΔE 12.3 from the original
Tritanopia#00435Ano blue cones; rare, and affects men and women equally; ΔE 70.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.66:1WCAG large text: AAA
Contrast with black, large text1.66:1WCAG large text: Fail

Named colours

Navy · ΔE 9.5Dark blue · ΔE 10.4Indigo · ΔE 15Midnight blue · ΔE 20.1Rebecca purple · ΔE 21.7Slate blue · ΔE 26.2
Nearest named CSS colourNavy (#000080)ΔE 9.45, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#979117
Analogous#175D97, #511797
Triadic#97171D, #1D9717
Split complementary#975117, #5D9717
Tetradic#97175D, #979117, #179751

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8C91EE
Lighter +30%#6067E7
Lighter +20%#343CE0
Lighter +10%#1E25C3
Darker −10%#10146B
Darker −20%#0A0C3E
Darker −30%#030412
Darker −40%#000000
More saturated +25%#0109AD
Less saturated −25%#2D3181

Channel breakdown

R23
G29
B151
Red23 (9%)
Green29 (11.4%)
Blue151 (59.2%)
Hue237.19°
Saturation (HSL)73.56%
Lightness34.12%
Dominant channelBlue
Hex per channelR 17 · G 1D · B 97

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Every value on this page was computed from “171d97” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.