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Recognised as Colour

#2D3F81

  • #2D3F81
  • Blue
  • Dark
  • Nearest: Dark slateblue

#2D3F81 is a blue with RGB values 45, 63, 129 and HSL 227°, 48%, 34%. It is a dark colour, so white text on it reaches 9.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#2D3F81#2D3F81
HEX#2D3F81
RGBrgb(45, 63, 129)
RGB (0–1)0.1765, 0.2471, 0.5059
RGB percentages17.6%, 24.7%, 50.6%
HSLhsl(227.1, 48.3%, 34.1%)
HSV / HSBhsv(227.1, 65.1%, 50.6%)
CMYK65.1%, 51.2%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,965,377
CSS custom property--colour: #2D3F81;

Brightness & contrast

Relative luminance0.05698WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.82:1
Contrast with white9.82:1WCAG normal text: AAA
Contrast with black2.14:1WCAG normal text: Fail
Greyscale equivalent#404040
Inverted#D2C07E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1C4783no red cones; affects about 1% of men; ΔE 7.8 from the original
Deuteranopia#084080no green cones; the most common form, about 1% of men; ΔE 6 from the original
Tritanopia#004E5Ano blue cones; rare, and affects men and women equally; ΔE 41.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.82:1WCAG large text: AAA
Contrast with black, large text2.14:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.2Midnight blue · ΔE 23Rebecca purple · ΔE 28.9Steel blue · ΔE 31.6Slate blue · ΔE 32.2Royal blue · ΔE 33.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.19, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#816F2D
Analogous#2D6981, #452D81
Triadic#812D3F, #3F812D
Split complementary#81452D, #69812D
Tetradic#812D69, #816F2D, #2D8145

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9DABDD
Lighter +30%#778AD0
Lighter +20%#526AC2
Lighter +10%#3A51A7
Darker −10%#202D5B
Darker −20%#131A35
Darker −30%#050810
Darker −40%#000000
More saturated +25%#173397
Less saturated −25%#434B6B

Channel breakdown

R45
G63
B129
Red45 (17.6%)
Green63 (24.7%)
Blue129 (50.6%)
Hue227.14°
Saturation (HSL)48.28%
Lightness34.12%
Dominant channelBlue
Hex per channelR 2D · G 3F · B 81

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Every value on this page was computed from “2d3f81” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.