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Recognised as Colour

#2A4581

  • #2A4581
  • Blue
  • Dark
  • Nearest: Dark slateblue

#2A4581 is a blue with RGB values 42, 69, 129 and HSL 221°, 51%, 34%. It is a dark colour, so white text on it reaches 9.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#2A4581#2A4581
HEX#2A4581
RGBrgb(42, 69, 129)
RGB (0–1)0.1647, 0.2706, 0.5059
RGB percentages16.5%, 27.1%, 50.6%
HSLhsl(221.4, 50.9%, 33.5%)
HSV / HSBhsv(221.4, 67.4%, 50.6%)
CMYK67.4%, 46.5%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,770,305
CSS custom property--colour: #2A4581;

Brightness & contrast

Relative luminance0.06333WCAG 2.x, 0 is black and 1 is white
Perceived brightness72.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.26:1
Contrast with white9.26:1WCAG normal text: AAA
Contrast with black2.27:1WCAG normal text: Fail
Greyscale equivalent#444444
Inverted#D5BA7E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#284B83no red cones; affects about 1% of men; ΔE 4.4 from the original
Deuteranopia#194380no green cones; the most common form, about 1% of men; ΔE 2.7 from the original
Tritanopia#00535Cno blue cones; rare, and affects men and women equally; ΔE 38.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.26:1WCAG large text: AAA
Contrast with black, large text2.27:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 16.2Steel blue · ΔE 27.1Midnight blue · ΔE 28.4Rebecca purple · ΔE 33.8Cornflower blue · ΔE 34Slate blue · ΔE 36.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.17, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#81662A
Analogous#2A7181, #3A2A81
Triadic#812A45, #45812A
Split complementary#813A2A, #71812A
Tetradic#812A71, #81662A, #2A813A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#99AEDE
Lighter +30%#7390D1
Lighter +20%#4C72C5
Lighter +10%#375AA7
Darker −10%#1D305B
Darker −20%#111C34
Darker −30%#04070E
Darker −40%#000000
More saturated +25%#153D96
Less saturated −25%#3F4D6C

Channel breakdown

R42
G69
B129
Red42 (16.5%)
Green69 (27.1%)
Blue129 (50.6%)
Hue221.38°
Saturation (HSL)50.88%
Lightness33.53%
Dominant channelBlue
Hex per channelR 2A · G 45 · B 81

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Every value on this page was computed from “2a4581” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.