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Recognised as Colour

#1F3549

  • #1F3549
  • Blue
  • Dark
  • Nearest: Dark slate grey

#1F3549 is a blue with RGB values 31, 53, 73 and HSL 209°, 40%, 20%. It is a dark colour, so white text on it reaches 12.6:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#1F3549#1F3549
HEX#1F3549
RGBrgb(31, 53, 73)
RGB (0–1)0.1216, 0.2078, 0.2863
RGB percentages12.2%, 20.8%, 28.6%
HSLhsl(208.6, 40.4%, 20.4%)
HSV / HSBhsv(208.6, 57.5%, 28.6%)
CMYK57.5%, 27.4%, 0%, 71.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,045,257
CSS custom property--colour: #1F3549;

Brightness & contrast

Relative luminance0.03319WCAG 2.x, 0 is black and 1 is white
Perceived brightness50.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.62:1
Contrast with white12.62:1WCAG normal text: AAA
Contrast with black1.66:1WCAG normal text: Fail
Greyscale equivalent#323232
Inverted#E0CAB6

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2D354Ano red cones; affects about 1% of men; ΔE 4.9 from the original
Deuteranopia#273149no green cones; the most common form, about 1% of men; ΔE 5.3 from the original
Tritanopia#083A3Cno blue cones; rare, and affects men and women equally; ΔE 15.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text12.62:1WCAG large text: AAA
Contrast with black, large text1.66:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 18Black · ΔE 26.1Dim grey · ΔE 27.6Slate grey · ΔE 31.9Light slate grey · ΔE 34.9Steel blue · ΔE 35.7
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 17.96, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#49331F
Analogous#1F4948, #1F2049
Triadic#491F35, #35491F
Split complementary#491F20, #49481F
Tetradic#481F49, #49331F, #20491F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#719CC3
Lighter +30%#4D83B4
Lighter +20%#3D6991
Lighter +10%#2E4F6D
Darker −10%#101B25
Darker −20%#010101
Darker −30%#000000
Darker −40%#000000
More saturated +25%#123656
Less saturated −25%#2C343C

Channel breakdown

R31
G53
B73
Red31 (12.2%)
Green53 (20.8%)
Blue73 (28.6%)
Hue208.57°
Saturation (HSL)40.38%
Lightness20.39%
Dominant channelBlue
Hex per channelR 1F · G 35 · B 49

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Every value on this page was computed from “1f3549” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.