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Recognised as Colour

#013F81

  • #013F81
  • Blue
  • Dark
  • Nearest: Dark slateblue

#013F81 is a blue with RGB values 1, 63, 129 and HSL 211°, 98%, 25%. It is a dark colour, so white text on it reaches 10.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#013F81#013F81
HEX#013F81
RGBrgb(1, 63, 129)
RGB (0–1)0.0039, 0.2471, 0.5059
RGB percentages0.4%, 24.7%, 50.6%
HSLhsl(210.9, 98.5%, 25.5%)
HSV / HSBhsv(210.9, 99.2%, 50.6%)
CMYK99.2%, 51.2%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer81,793
CSS custom property--colour: #013F81;

Brightness & contrast

Relative luminance0.05146WCAG 2.x, 0 is black and 1 is white
Perceived brightness65 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.35:1
Contrast with white10.35:1WCAG normal text: AAA
Contrast with black2.03:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#FEC07E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#154683no red cones; affects about 1% of men; ΔE 4.9 from the original
Deuteranopia#003B80no green cones; the most common form, about 1% of men; ΔE 3.1 from the original
Tritanopia#004F5Ano blue cones; rare, and affects men and women equally; ΔE 40 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.35:1WCAG large text: AAA
Contrast with black, large text2.03:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 16.2Midnight blue · ΔE 25.3Steel blue · ΔE 30.7Rebecca purple · ΔE 33.5Royal blue · ΔE 35Slate blue · ΔE 35.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.16, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#814301
Analogous#017F81, #030181
Triadic#81013F, #3F8101
Split complementary#810301, #7F8101
Tetradic#81017F, #814301, #018103

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#50A4FE
Lighter +30%#1E8AFD
Lighter +20%#0270E6
Lighter +10%#0158B4
Darker −10%#01264E
Darker −20%#000E1C
Darker −30%#000000
Darker −40%#000000
More saturated +25%#003F82
Less saturated −25%#114071

Channel breakdown

R1
G63
B129
Red1 (0.4%)
Green63 (24.7%)
Blue129 (50.6%)
Hue210.94°
Saturation (HSL)98.46%
Lightness25.49%
Dominant channelBlue
Hex per channelR 01 · G 3F · B 81

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Every value on this page was computed from “013f81” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.