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Recognised as Colour

#171FBC

  • #171FBC
  • Blue
  • Dark
  • Nearest: Dark blue

#171FBC is a blue with RGB values 23, 31, 188 and HSL 237°, 78%, 41%. It is a dark colour, so white text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Dark blue.

Colour values

#171FBC#171FBC
HEX#171FBC
RGBrgb(23, 31, 188)
RGB (0–1)0.0902, 0.1216, 0.7373
RGB percentages9%, 12.2%, 73.7%
HSLhsl(237.1, 78.2%, 41.4%)
HSV / HSBhsv(237.1, 87.8%, 73.7%)
CMYK87.8%, 83.5%, 0%, 26.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,515,452
CSS custom property--colour: #171FBC;

Brightness & contrast

Relative luminance0.04793WCAG 2.x, 0 is black and 1 is white
Perceived brightness68.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.72:1
Contrast with white10.72:1WCAG normal text: AAA
Contrast with black1.96:1WCAG normal text: Fail
Greyscale equivalent#292929
Inverted#E8E043

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0046C0no red cones; affects about 1% of men; ΔE 26.2 from the original
Deuteranopia#0035B9no green cones; the most common form, about 1% of men; ΔE 16 from the original
Tritanopia#005370no blue cones; rare, and affects men and women equally; ΔE 85.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.72:1WCAG large text: AAA
Contrast with black, large text1.96:1WCAG large text: Fail

Named colours

Dark blue · ΔE 16.1Medium blue · ΔE 18Navy · ΔE 20.8Blue violet · ΔE 23.2Indigo · ΔE 26.9Dark violet · ΔE 27.8
Nearest named CSS colourDark blue (#00008B)ΔE 16.08, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BCB417
Analogous#1771BC, #6217BC
Triadic#BC171F, #1FBC17
Split complementary#BC6217, #71BC17
Tetradic#BC1771, #BCB417, #17BC62

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#AAAEF5
Lighter +30%#7D82EF
Lighter +20%#4F57EA
Lighter +10%#222BE4
Darker −10%#11188F
Darker −20%#0C1061
Darker −30%#060934
Darker −40%#010106
More saturated +25%#000AD3
Less saturated −25%#3137A2

Channel breakdown

R23
G31
B188
Red23 (9%)
Green31 (12.2%)
Blue188 (73.7%)
Hue237.09°
Saturation (HSL)78.2%
Lightness41.37%
Dominant channelBlue
Hex per channelR 17 · G 1F · B BC

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