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Recognised as Colour

#51428B

  • #51428B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#51428B is a blue with RGB values 81, 66, 139 and HSL 252°, 36%, 40%. It is a dark colour, so white text on it reaches 8.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#51428B#51428B
HEX#51428B
RGBrgb(81, 66, 139)
RGB (0–1)0.3176, 0.2588, 0.5451
RGB percentages31.8%, 25.9%, 54.5%
HSLhsl(252.3, 35.6%, 40.2%)
HSV / HSBhsv(252.3, 52.5%, 54.5%)
CMYK41.7%, 52.5%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,325,451
CSS custom property--colour: #51428B;

Brightness & contrast

Relative luminance0.0751WCAG 2.x, 0 is black and 1 is white
Perceived brightness82 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.39:1
Contrast with white8.39:1WCAG normal text: AAA
Contrast with black2.5:1WCAG normal text: Fail
Greyscale equivalent#4A4A4A
Inverted#AEBD74

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#234F8Eno red cones; affects about 1% of men; ΔE 17.2 from the original
Deuteranopia#254C89no green cones; the most common form, about 1% of men; ΔE 16.9 from the original
Tritanopia#415160no blue cones; rare, and affects men and women equally; ΔE 39 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.39:1WCAG large text: AAA
Contrast with black, large text2.5:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 4.1Rebecca purple · ΔE 19.7Midnight blue · ΔE 21.3Slate blue · ΔE 25.3Medium purple · ΔE 27.4Royal blue · ΔE 30.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 4.14, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7C8B42
Analogous#42588B, #75428B
Triadic#8B5142, #428B51
Split complementary#8B7642, #588B42
Tetradic#8B4258, #7C8B42, #428B76

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C2BBDE
Lighter +30%#A398CE
Lighter +20%#8475BE
Lighter +10%#6553AD
Darker −10%#3D3268
Darker −20%#292146
Darker −30%#151123
Darker −40%#000001
More saturated +25%#4228A5
Less saturated −25%#605C71

Channel breakdown

R81
G66
B139
Red81 (31.8%)
Green66 (25.9%)
Blue139 (54.5%)
Hue252.33°
Saturation (HSL)35.61%
Lightness40.2%
Dominant channelBlue
Hex per channelR 51 · G 42 · B 8B

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Every value on this page was computed from “51428b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.