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Recognised as Colour

#171F45

  • #171F45
  • Blue
  • Dark
  • Nearest: Dark slateblue

#171F45 is a blue with RGB values 23, 31, 69 and HSL 230°, 50%, 18%. It is a dark colour, so white text on it reaches 15.9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#171F45#171F45
HEX#171F45
RGBrgb(23, 31, 69)
RGB (0–1)0.0902, 0.1216, 0.2706
RGB percentages9%, 12.2%, 27.1%
HSLhsl(229.6, 50%, 18%)
HSV / HSBhsv(229.6, 66.7%, 27.1%)
CMYK66.7%, 55.1%, 0%, 72.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,515,333
CSS custom property--colour: #171F45;

Brightness & contrast

Relative luminance0.01592WCAG 2.x, 0 is black and 1 is white
Perceived brightness35.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.93:1
Contrast with white15.93:1WCAG normal text: AAA
Contrast with black1.32:1WCAG normal text: Fail
Greyscale equivalent#202020
Inverted#E8E0BA

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0C2446no red cones; affects about 1% of men; ΔE 5.7 from the original
Deuteranopia#052044no green cones; the most common form, about 1% of men; ΔE 4.5 from the original
Tritanopia#00282Eno blue cones; rare, and affects men and women equally; ΔE 27.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.93:1WCAG large text: AAA
Contrast with black, large text1.32:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 29.1Black · ΔE 30.2Midnight blue · ΔE 32.6Dark slate grey · ΔE 35.6Dim grey · ΔE 41.4Steel blue · ΔE 42.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 29.11, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#453D17
Analogous#173645, #261745
Triadic#45171F, #1F4517
Split complementary#452617, #364517
Tetradic#451736, #453D17, #174526

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#5F71C9
Lighter +30%#3D53B8
Lighter +20%#314192
Lighter +10%#24306B
Darker −10%#0A0E1F
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0C1751
Less saturated −25%#232639

Channel breakdown

R23
G31
B69
Red23 (9%)
Green31 (12.2%)
Blue69 (27.1%)
Hue229.57°
Saturation (HSL)50%
Lightness18.04%
Dominant channelBlue
Hex per channelR 17 · G 1F · B 45

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Every value on this page was computed from “171f45” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.