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Recognised as Colour

#171F86

  • #171F86
  • Blue
  • Dark
  • Nearest: Midnight blue

#171F86 is a blue with RGB values 23, 31, 134 and HSL 236°, 71%, 31%. It is a dark colour, so white text on it reaches 13.3:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#171F86#171F86
HEX#171F86
RGBrgb(23, 31, 134)
RGB (0–1)0.0902, 0.1216, 0.5255
RGB percentages9%, 12.2%, 52.5%
HSLhsl(235.7, 70.7%, 30.8%)
HSV / HSBhsv(235.7, 82.8%, 52.5%)
CMYK82.8%, 76.9%, 0%, 47.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,515,398
CSS custom property--colour: #171F86;

Brightness & contrast

Relative luminance0.02883WCAG 2.x, 0 is black and 1 is white
Perceived brightness52.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.32:1
Contrast with white13.32:1WCAG normal text: AAA
Contrast with black1.58:1WCAG normal text: Fail
Greyscale equivalent#252525
Inverted#E8E079

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003589no red cones; affects about 1% of men; ΔE 17.2 from the original
Deuteranopia#002A84no green cones; the most common form, about 1% of men; ΔE 10.3 from the original
Tritanopia#003D51no blue cones; rare, and affects men and women equally; ΔE 60.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.32:1WCAG large text: AAA
Contrast with black, large text1.58:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 9.7Navy · ΔE 15.2Indigo · ΔE 16.4Rebecca purple · ΔE 18.3Dark blue · ΔE 19Dark slateblue · ΔE 21.5
Nearest named CSS colourMidnight blue (#191970)ΔE 9.67, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#867E17
Analogous#175786, #461786
Triadic#86171F, #1F8617
Split complementary#864717, #578617
Tetradic#861757, #867E17, #178646

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8087E9
Lighter +30%#545EE2
Lighter +20%#2936DA
Lighter +10%#1E29B2
Darker −10%#10155A
Darker −20%#080B2F
Darker −30%#010103
Darker −40%#000000
More saturated +25%#030E9A
Less saturated −25%#2B3072

Channel breakdown

R23
G31
B134
Red23 (9%)
Green31 (12.2%)
Blue134 (52.5%)
Hue235.68°
Saturation (HSL)70.7%
Lightness30.78%
Dominant channelBlue
Hex per channelR 17 · G 1F · B 86

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Every value on this page was computed from “171f86” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.