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Colour

#3F478E

  • #3F478E
  • Blue
  • Dark
  • Nearest: Dark slateblue

#3F478E is a blue with RGB values 63, 71, 142 and HSL 234°, 39%, 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

#3F478E#3F478E
HEX#3F478E
RGBrgb(63, 71, 142)
RGB (0–1)0.2471, 0.2784, 0.5569
RGB percentages24.7%, 27.8%, 55.7%
HSLhsl(233.9, 38.5%, 40.2%)
HSV / HSBhsv(233.9, 55.6%, 55.7%)
CMYK55.6%, 50%, 0%, 44.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,147,086
CSS custom property--colour: #3F478E;

Brightness & contrast

Relative luminance0.07516WCAG 2.x, 0 is black and 1 is white
Perceived brightness80.3 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#C0B871

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#255191no red cones; affects about 1% of men; ΔE 10.6 from the original
Deuteranopia#1B4A8Cno green cones; the most common form, about 1% of men; ΔE 9.1 from the original
Tritanopia#185763no blue cones; rare, and affects men and women equally; ΔE 43.7 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 8.1Midnight blue · ΔE 23.5Rebecca purple · ΔE 25.3Slate blue · ΔE 27.6Royal blue · ΔE 29.9Medium purple · ΔE 30.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 8.05, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8E863F
Analogous#3F6E8E, #5F3F8E
Triadic#8E3F47, #478E3F
Split complementary#8E5F3F, #6E8E3F
Tetradic#8E3F6E, #8E863F, #3F8E5F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B9BDE0
Lighter +30%#969CD0
Lighter +20%#727AC1
Lighter +10%#4F59B1
Darker −10%#2F356B
Darker −20%#202447
Darker −30%#101224
Darker −40%#000001
More saturated +25%#2533A8
Less saturated −25%#595B74

Channel breakdown

R63
G71
B142
Red63 (24.7%)
Green71 (27.8%)
Blue142 (55.7%)
Hue233.92°
Saturation (HSL)38.54%
Lightness40.2%
Dominant channelBlue
Hex per channelR 3F · G 47 · B 8E

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Every value on this page was computed from “3f478e” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.