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Recognised as Colour

#42478B

  • #42478B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#42478B is a blue with RGB values 66, 71, 139 and HSL 236°, 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

#42478B#42478B
HEX#42478B
RGBrgb(66, 71, 139)
RGB (0–1)0.2588, 0.2784, 0.5451
RGB percentages25.9%, 27.8%, 54.5%
HSLhsl(235.9, 35.6%, 40.2%)
HSV / HSBhsv(235.9, 52.5%, 54.5%)
CMYK52.5%, 48.9%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,343,691
CSS custom property--colour: #42478B;

Brightness & contrast

Relative luminance0.07529WCAG 2.x, 0 is black and 1 is white
Perceived brightness80.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.38:1
Contrast with white8.38:1WCAG normal text: AAA
Contrast with black2.51:1WCAG normal text: Fail
Greyscale equivalent#4B4B4B
Inverted#BDB874

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#29518Dno red cones; affects about 1% of men; ΔE 11.2 from the original
Deuteranopia#214B8Ano green cones; the most common form, about 1% of men; ΔE 9.4 from the original
Tritanopia#245662no blue cones; rare, and affects men and women equally; ΔE 40.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.38:1WCAG large text: AAA
Contrast with black, large text2.51:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 8.9Midnight blue · ΔE 24.4Rebecca purple · ΔE 26.2Slate blue · ΔE 29Steel blue · ΔE 30.2Medium purple · ΔE 31
Nearest named CSS colourDark slateblue (#483D8B)ΔE 8.92, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B8642
Analogous#426C8B, #62428B
Triadic#8B4247, #478B42
Split complementary#8B6242, #6C8B42
Tetradic#8B426C, #8B8642, #428B62

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BBBDDE
Lighter +30%#989CCE
Lighter +20%#757ABE
Lighter +10%#5359AD
Darker −10%#323568
Darker −20%#212446
Darker −30%#111223
Darker −40%#000001
More saturated +25%#2831A5
Less saturated −25%#5C5D71

Channel breakdown

R66
G71
B139
Red66 (25.9%)
Green71 (27.8%)
Blue139 (54.5%)
Hue235.89°
Saturation (HSL)35.61%
Lightness40.2%
Dominant channelBlue
Hex per channelR 42 · G 47 · B 8B

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Every value on this page was computed from “42478b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.