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Recognised as Colour

#283F65

  • #283F65
  • Blue
  • Dark
  • Nearest: Dark slate grey

#283F65 is a blue with RGB values 40, 63, 101 and HSL 217°, 43%, 28%. It is a dark colour, so white text on it reaches 10.6:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#283F65#283F65
HEX#283F65
RGBrgb(40, 63, 101)
RGB (0–1)0.1569, 0.2471, 0.3961
RGB percentages15.7%, 24.7%, 39.6%
HSLhsl(217.4, 43.3%, 27.6%)
HSV / HSBhsv(217.4, 60.4%, 39.6%)
CMYK60.4%, 37.6%, 0%, 60.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,637,669
CSS custom property--colour: #283F65;

Brightness & contrast

Relative luminance0.04946WCAG 2.x, 0 is black and 1 is white
Perceived brightness63 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.56:1
Contrast with white10.56:1WCAG normal text: AAA
Contrast with black1.99:1WCAG normal text: Fail
Greyscale equivalent#3D3D3D
Inverted#D7C09A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2F4267no red cones; affects about 1% of men; ΔE 1.9 from the original
Deuteranopia#283C64no green cones; the most common form, about 1% of men; ΔE 2.2 from the original
Tritanopia#00474Dno blue cones; rare, and affects men and women equally; ΔE 26.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.56:1WCAG large text: AAA
Contrast with black, large text1.99:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 26.8Steel blue · ΔE 28Dark slateblue · ΔE 28.3Slate grey · ΔE 30.6Dim grey · ΔE 31Light slate grey · ΔE 33.1
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 26.82, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#654E28
Analogous#285E65, #2F2865
Triadic#65283F, #3F6528
Split complementary#652F28, #5E6528
Tetradic#65285E, #654E28, #28652F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#89A4D0
Lighter +30%#6488C2
Lighter +20%#456DAE
Lighter +10%#36568A
Darker −10%#1A2840
Darker −20%#0B111C
Darker −30%#000000
Darker −40%#000000
More saturated +25%#163B77
Less saturated −25%#3A4353

Channel breakdown

R40
G63
B101
Red40 (15.7%)
Green63 (24.7%)
Blue101 (39.6%)
Hue217.38°
Saturation (HSL)43.26%
Lightness27.65%
Dominant channelBlue
Hex per channelR 28 · G 3F · B 65

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Every value on this page was computed from “283f65” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.