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Recognised as Colour

#3F548C

  • #3F548C
  • Blue
  • Dark
  • Nearest: Dark slateblue

#3F548C is a blue with RGB values 63, 84, 140 and HSL 224°, 38%, 40%. It is a dark colour, so white text on it reaches 7.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#3F548C#3F548C
HEX#3F548C
RGBrgb(63, 84, 140)
RGB (0–1)0.2471, 0.3294, 0.549
RGB percentages24.7%, 32.9%, 54.9%
HSLhsl(223.6, 37.9%, 39.8%)
HSV / HSBhsv(223.6, 55%, 54.9%)
CMYK55%, 40%, 0%, 45.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,150,412
CSS custom property--colour: #3F548C;

Brightness & contrast

Relative luminance0.09291WCAG 2.x, 0 is black and 1 is white
Perceived brightness87 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.35:1
Contrast with white7.35:1WCAG normal text: AAA
Contrast with black2.86:1WCAG normal text: Fail
Greyscale equivalent#545454
Inverted#C0AB73

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3D5A8Eno red cones; affects about 1% of men; ΔE 4.3 from the original
Deuteranopia#34538Bno green cones; the most common form, about 1% of men; ΔE 2.5 from the original
Tritanopia#176069no blue cones; rare, and affects men and women equally; ΔE 35.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.35:1WCAG large text: AAA
Contrast with black, large text2.86:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.7Steel blue · ΔE 20.8Cornflower blue · ΔE 29.8Slate grey · ΔE 30.4Light slate grey · ΔE 31.8Midnight blue · ΔE 34.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.69, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8C773F
Analogous#3F7B8C, #513F8C
Triadic#8C3F54, #548C3F
Split complementary#8C513F, #7B8C3F
Tetradic#8C3F7A, #8C773F, #3F8C51

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B8C3DF
Lighter +30%#95A5CF
Lighter +20%#7287BF
Lighter +10%#4F69AF
Darker −10%#2F3F69
Darker −20%#1F2A46
Darker −30%#101522
Darker −40%#000000
More saturated +25%#2648A5
Less saturated −25%#586073

Channel breakdown

R63
G84
B140
Red63 (24.7%)
Green84 (32.9%)
Blue140 (54.9%)
Hue223.64°
Saturation (HSL)37.93%
Lightness39.8%
Dominant channelBlue
Hex per channelR 3F · G 54 · B 8C

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Every value on this page was computed from “3f548c” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.