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Recognised as Colour

#283BB5

  • #283BB5
  • Blue
  • Dark
  • Nearest: Slate blue

#283BB5 is a blue with RGB values 40, 59, 181 and HSL 232°, 64%, 43%. It is a dark colour, so white text on it reaches 8.8:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#283BB5#283BB5
HEX#283BB5
RGBrgb(40, 59, 181)
RGB (0–1)0.1569, 0.2314, 0.7098
RGB percentages15.7%, 23.1%, 71%
HSLhsl(231.9, 63.8%, 43.3%)
HSV / HSBhsv(231.9, 77.9%, 71%)
CMYK77.9%, 67.4%, 0%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,636,725
CSS custom property--colour: #283BB5;

Brightness & contrast

Relative luminance0.06915WCAG 2.x, 0 is black and 1 is white
Perceived brightness79.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.81:1
Contrast with white8.81:1WCAG normal text: AAA
Contrast with black2.38:1WCAG normal text: Fail
Greyscale equivalent#404040
Inverted#D7C44A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0051B9no red cones; affects about 1% of men; ΔE 17.2 from the original
Deuteranopia#0044B3no green cones; the most common form, about 1% of men; ΔE 9.5 from the original
Tritanopia#005C73no blue cones; rare, and affects men and women equally; ΔE 69.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.81:1WCAG large text: AAA
Contrast with black, large text2.38:1WCAG large text: Fail

Named colours

Slate blue · ΔE 16.2Royal blue · ΔE 19.4Rebecca purple · ΔE 20.1Medium slateblue · ΔE 21Navy · ΔE 21.6Dark blue · ΔE 21.8
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 16.18, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B5A228
Analogous#2881B5, #5C28B5
Triadic#B5283B, #3BB528
Split complementary#B55C28, #82B528
Tetradic#B52881, #B5A228, #28B55C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B9C1F0
Lighter +30%#909BE6
Lighter +20%#6676DD
Lighter +10%#3C51D4
Darker −10%#1F2D8B
Darker −20%#162061
Darker −30%#0C1238
Darker −40%#03050E
More saturated +25%#0C27D1
Less saturated −25%#444F99

Channel breakdown

R40
G59
B181
Red40 (15.7%)
Green59 (23.1%)
Blue181 (71%)
Hue231.91°
Saturation (HSL)63.8%
Lightness43.33%
Dominant channelBlue
Hex per channelR 28 · G 3B · B B5

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Every value on this page was computed from “283bb5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.