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Recognised as Colour

#283D88

  • #283D88
  • Blue
  • Dark
  • Nearest: Dark slateblue

#283D88 is a blue with RGB values 40, 61, 136 and HSL 227°, 55%, 35%. It is a dark colour, so white text on it reaches 9.9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#283D88#283D88
HEX#283D88
RGBrgb(40, 61, 136)
RGB (0–1)0.1569, 0.2392, 0.5333
RGB percentages15.7%, 23.9%, 53.3%
HSLhsl(226.9, 54.5%, 34.5%)
HSV / HSBhsv(226.9, 70.6%, 53.3%)
CMYK70.6%, 55.1%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,637,192
CSS custom property--colour: #283D88;

Brightness & contrast

Relative luminance0.05566WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.94:1
Contrast with white9.94:1WCAG normal text: AAA
Contrast with black2.11:1WCAG normal text: Fail
Greyscale equivalent#3E3E3E
Inverted#D7C277

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#06478Bno red cones; affects about 1% of men; ΔE 9.6 from the original
Deuteranopia#003F86no green cones; the most common form, about 1% of men; ΔE 6.2 from the original
Tritanopia#004F5Cno blue cones; rare, and affects men and women equally; ΔE 46.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.94:1WCAG large text: AAA
Contrast with black, large text2.11:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 8.3Midnight blue · ΔE 18.8Rebecca purple · ΔE 24.9Slate blue · ΔE 27.8Royal blue · ΔE 29.6Medium purple · ΔE 32.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 8.27, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#887328
Analogous#286D88, #432888
Triadic#88283D, #3D8828
Split complementary#884328, #6D8828
Tetradic#88286D, #887328, #288843

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9BAAE1
Lighter +30%#7389D6
Lighter +20%#4C67CA
Lighter +10%#344FAF
Darker −10%#1C2B61
Darker −20%#111A39
Darker −30%#050812
Darker −40%#000000
More saturated +25%#12319E
Less saturated −25%#3E4972

Channel breakdown

R40
G61
B136
Red40 (15.7%)
Green61 (23.9%)
Blue136 (53.3%)
Hue226.88°
Saturation (HSL)54.55%
Lightness34.51%
Dominant channelBlue
Hex per channelR 28 · G 3D · B 88

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Every value on this page was computed from “283d88” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.