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Recognised as Colour

#1F2B66

  • #1F2B66
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1F2B66 is a blue with RGB values 31, 43, 102 and HSL 230°, 53%, 26%. It is a dark colour, so white text on it reaches 13.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1F2B66#1F2B66
HEX#1F2B66
RGBrgb(31, 43, 102)
RGB (0–1)0.1216, 0.1686, 0.4
RGB percentages12.2%, 16.9%, 40%
HSLhsl(229.9, 53.4%, 26.1%)
HSV / HSBhsv(229.9, 69.6%, 40%)
CMYK69.6%, 57.8%, 0%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,042,726
CSS custom property--colour: #1F2B66;

Brightness & contrast

Relative luminance0.02978WCAG 2.x, 0 is black and 1 is white
Perceived brightness50.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.16:1
Contrast with white13.16:1WCAG normal text: AAA
Contrast with black1.6:1WCAG normal text: Fail
Greyscale equivalent#2D2D2D
Inverted#E0D499

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#013468no red cones; affects about 1% of men; ΔE 9.6 from the original
Deuteranopia#002D65no green cones; the most common form, about 1% of men; ΔE 5.7 from the original
Tritanopia#003944no blue cones; rare, and affects men and women equally; ΔE 37.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text13.16:1WCAG large text: AAA
Contrast with black, large text1.6:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 15.6Midnight blue · ΔE 20.7Rebecca purple · ΔE 31.4Slate blue · ΔE 38.6Steel blue · ΔE 38.6Indigo · ΔE 39.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 15.64, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#665A1F
Analogous#1F4E66, #371F66
Triadic#661F2B, #2B661F
Split complementary#66371F, #4F661F
Tetradic#661F4E, #665A1F, #1F6637

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7A8AD7
Lighter +30%#5367CB
Lighter +20%#374CB4
Lighter +10%#2B3B8D
Darker −10%#131B3F
Darker −20%#070A18
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0E2077
Less saturated −25%#303655

Channel breakdown

R31
G43
B102
Red31 (12.2%)
Green43 (16.9%)
Blue102 (40%)
Hue229.86°
Saturation (HSL)53.38%
Lightness26.08%
Dominant channelBlue
Hex per channelR 1F · G 2B · B 66

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Every value on this page was computed from “1f2b66” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.