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Recognised as Colour

#172A4D

  • #172A4D
  • Blue
  • Dark
  • Nearest: Dark slate grey

#172A4D is a blue with RGB values 23, 42, 77 and HSL 219°, 54%, 20%. It is a dark colour, so white text on it reaches 14.2:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#172A4D#172A4D
HEX#172A4D
RGBrgb(23, 42, 77)
RGB (0–1)0.0902, 0.1647, 0.302
RGB percentages9%, 16.5%, 30.2%
HSLhsl(218.9, 54%, 19.6%)
HSV / HSBhsv(218.9, 70.1%, 30.2%)
CMYK70.1%, 45.5%, 0%, 69.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,518,157
CSS custom property--colour: #172A4D;

Brightness & contrast

Relative luminance0.02374WCAG 2.x, 0 is black and 1 is white
Perceived brightness43.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 14.24:1
Contrast with white14.24:1WCAG normal text: AAA
Contrast with black1.47:1WCAG normal text: Fail
Greyscale equivalent#282828
Inverted#E8D5B2

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1A2D4Eno red cones; affects about 1% of men; ΔE 2.1 from the original
Deuteranopia#12284Cno green cones; the most common form, about 1% of men; ΔE 1.4 from the original
Tritanopia#003237no blue cones; rare, and affects men and women equally; ΔE 24.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text14.24:1WCAG large text: AAA
Contrast with black, large text1.47:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 29.9Black · ΔE 30Dark slateblue · ΔE 30.6Dim grey · ΔE 36.5Midnight blue · ΔE 36.8Steel blue · ΔE 37.3
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 29.93, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4D3A17
Analogous#17454D, #1F174D
Triadic#4D172A, #2A4D17
Split complementary#4D1F17, #454D17
Tetradic#4D1745, #4D3A17, #174D1F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6088D0
Lighter +30%#3A6AC3
Lighter +20%#2E559C
Lighter +10%#233F74
Darker −10%#0B1526
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A265A
Less saturated −25%#242E41

Channel breakdown

R23
G42
B77
Red23 (9%)
Green42 (16.5%)
Blue77 (30.2%)
Hue218.89°
Saturation (HSL)54%
Lightness19.61%
Dominant channelBlue
Hex per channelR 17 · G 2A · B 4D

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Every value on this page was computed from “172a4d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.