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Recognised as Colour

#171B4D

  • #171B4D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#171B4D is a blue with RGB values 23, 27, 77 and HSL 236°, 54%, 20%. It is a dark colour, so white text on it reaches 16.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#171B4D#171B4D
HEX#171B4D
RGBrgb(23, 27, 77)
RGB (0–1)0.0902, 0.1059, 0.302
RGB percentages9%, 10.6%, 30.2%
HSLhsl(235.6, 54%, 19.6%)
HSV / HSBhsv(235.6, 70.1%, 30.2%)
CMYK70.1%, 64.9%, 0%, 69.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,514,317
CSS custom property--colour: #171B4D;

Brightness & contrast

Relative luminance0.01502WCAG 2.x, 0 is black and 1 is white
Perceived brightness35.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 16.15:1
Contrast with white16.15:1WCAG normal text: AAA
Contrast with black1.3:1WCAG normal text: Fail
Greyscale equivalent#1E1E1E
Inverted#E8E4B2

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00234Fno red cones; affects about 1% of men; ΔE 8.7 from the original
Deuteranopia#001E4Cno green cones; the most common form, about 1% of men; ΔE 6 from the original
Tritanopia#002731no blue cones; rare, and affects men and women equally; ΔE 33.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text16.15:1WCAG large text: AAA
Contrast with black, large text1.3:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 23.1Midnight blue · ΔE 23.8Rebecca purple · ΔE 36.7Black · ΔE 37.8Indigo · ΔE 42Dark slate grey · ΔE 43.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 23.07, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4D4917
Analogous#17364D, #2E174D
Triadic#4D171B, #1B4D17
Split complementary#4D2E17, #364D17
Tetradic#4D1736, #4D4917, #174D2E

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6069D0
Lighter +30%#3A44C3
Lighter +20%#2E379C
Lighter +10%#232974
Darker −10%#0B0D26
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A105A
Less saturated −25%#242641

Channel breakdown

R23
G27
B77
Red23 (9%)
Green27 (10.6%)
Blue77 (30.2%)
Hue235.56°
Saturation (HSL)54%
Lightness19.61%
Dominant channelBlue
Hex per channelR 17 · G 1B · B 4D

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Every value on this page was computed from “171b4d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.