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Recognised as Colour

#0A539F

  • #0A539F
  • Blue
  • Dark
  • Nearest: Dark slateblue

#0A539F is a blue with RGB values 10, 83, 159 and HSL 211°, 88%, 33%. It is a dark colour, so white text on it reaches 7.6:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#0A539F#0A539F
HEX#0A539F
RGBrgb(10, 83, 159)
RGB (0–1)0.0392, 0.3255, 0.6235
RGB percentages3.9%, 32.5%, 62.4%
HSLhsl(210.6, 88.2%, 33.1%)
HSV / HSBhsv(210.6, 93.7%, 62.4%)
CMYK93.7%, 47.8%, 0%, 37.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer676,767
CSS custom property--colour: #0A539F;

Brightness & contrast

Relative luminance0.08754WCAG 2.x, 0 is black and 1 is white
Perceived brightness83.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.63:1
Contrast with white7.63:1WCAG normal text: AAA
Contrast with black2.75:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#F5AC60

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#275AA2no red cones; affects about 1% of men; ΔE 4.3 from the original
Deuteranopia#004E9Eno green cones; the most common form, about 1% of men; ΔE 3.7 from the original
Tritanopia#006571no blue cones; rare, and affects men and women equally; ΔE 44.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.63:1WCAG large text: AAA
Contrast with black, large text2.75:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 17.5Steel blue · ΔE 26.4Cornflower blue · ΔE 26.5Royal blue · ΔE 27.6Dodgerblue · ΔE 29Midnight blue · ΔE 29.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 17.55, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9F560A
Analogous#0A9E9F, #0B0A9F
Triadic#9F0A53, #539F0A
Split complementary#9F0B0A, #9D9F0A
Tetradic#9F0A9E, #9F560A, #0A9F0B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7EB9F7
Lighter +30%#4E9FF4
Lighter +20%#1E85F1
Lighter +10%#0D6CCF
Darker −10%#073A6F
Darker −20%#04213F
Darker −30%#01080F
Darker −40%#000000
More saturated +25%#0053A9
Less saturated −25%#1F538A

Channel breakdown

R10
G83
B159
Red10 (3.9%)
Green83 (32.5%)
Blue159 (62.4%)
Hue210.6°
Saturation (HSL)88.17%
Lightness33.14%
Dominant channelBlue
Hex per channelR 0A · G 53 · B 9F

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Every value on this page was computed from “0a539f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.