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Recognised as Colour

#171F5F

  • #171F5F
  • Blue
  • Dark
  • Nearest: Midnight blue

#171F5F is a blue with RGB values 23, 31, 95 and HSL 233°, 61%, 23%. It is a dark colour, so white text on it reaches 15:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#171F5F#171F5F
HEX#171F5F
RGBrgb(23, 31, 95)
RGB (0–1)0.0902, 0.1216, 0.3725
RGB percentages9%, 12.2%, 37.3%
HSLhsl(233.3, 61%, 23.1%)
HSV / HSBhsv(233.3, 75.8%, 37.3%)
CMYK75.8%, 67.4%, 0%, 62.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,515,359
CSS custom property--colour: #171F5F;

Brightness & contrast

Relative luminance0.01988WCAG 2.x, 0 is black and 1 is white
Perceived brightness41.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.02:1
Contrast with white15.02:1WCAG normal text: AAA
Contrast with black1.4:1WCAG normal text: Fail
Greyscale equivalent#222222
Inverted#E8E0A0

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#002A61no red cones; affects about 1% of men; ΔE 10.5 from the original
Deuteranopia#00235Eno green cones; the most common form, about 1% of men; ΔE 5.9 from the original
Tritanopia#002F3Bno blue cones; rare, and affects men and women equally; ΔE 41.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.02:1WCAG large text: AAA
Contrast with black, large text1.4:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 15Dark slateblue · ΔE 16.5Rebecca purple · ΔE 29.2Indigo · ΔE 34.2Navy · ΔE 37Slate blue · ΔE 38.3
Nearest named CSS colourMidnight blue (#191970)ΔE 15.02, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5F5717
Analogous#17435F, #33175F
Triadic#5F171F, #1F5F17
Split complementary#5F3317, #435F17
Tetradic#5F1743, #5F5717, #175F33

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6874DA
Lighter +30%#3F4FD0
Lighter +20%#2B3AB1
Lighter +10%#212C88
Darker −10%#0D1236
Darker −20%#03040D
Darker −30%#000000
Darker −40%#000000
More saturated +25%#08146E
Less saturated −25%#262A50

Channel breakdown

R23
G31
B95
Red23 (9%)
Green31 (12.2%)
Blue95 (37.3%)
Hue233.33°
Saturation (HSL)61.02%
Lightness23.14%
Dominant channelBlue
Hex per channelR 17 · G 1F · B 5F

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Every value on this page was computed from “171f5f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.