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Colour

#003F8B

  • #003F8B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#003F8B is a blue with RGB values 0, 63, 139 and HSL 213°, 100%, 27%. It is a dark colour, so white text on it reaches 10.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#003F8B#003F8B
HEX#003F8B
RGBrgb(0, 63, 139)
RGB (0–1)0, 0.2471, 0.5451
RGB percentages0%, 24.7%, 54.5%
HSLhsl(212.8, 100%, 27.3%)
HSV / HSBhsv(212.8, 100%, 54.5%)
CMYK100%, 54.7%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,267
CSS custom property--colour: #003F8B;

Brightness & contrast

Relative luminance0.05419WCAG 2.x, 0 is black and 1 is white
Perceived brightness67.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.08:1
Contrast with white10.08:1WCAG normal text: AAA
Contrast with black2.08:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#FFC074

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00488Eno red cones; affects about 1% of men; ΔE 6.5 from the original
Deuteranopia#003C8Ano green cones; the most common form, about 1% of men; ΔE 2.2 from the original
Tritanopia#00525Eno blue cones; rare, and affects men and women equally; ΔE 46.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.08:1WCAG large text: AAA
Contrast with black, large text2.08:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12.8Midnight blue · ΔE 21.1Rebecca purple · ΔE 28.7Royal blue · ΔE 29.4Slate blue · ΔE 29.7Steel blue · ΔE 34.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.81, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B4C00
Analogous#00848B, #07008B
Triadic#8B003F, #3F8B00
Split complementary#8B0700, #848B00
Tetradic#8B0084, #8B4C00, #008B07

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#58A4FF
Lighter +30%#2588FF
Lighter +20%#006DF1
Lighter +10%#0056BE
Darker −10%#002858
Darker −20%#001125
Darker −30%#000000
Darker −40%#000000
More saturated +25%#003F8B
Less saturated −25%#11417A

Channel breakdown

R0
G63
B139
Red0 (0%)
Green63 (24.7%)
Blue139 (54.5%)
Hue212.81°
Saturation (HSL)100%
Lightness27.25%
Dominant channelBlue
Hex per channelR 00 · G 3F · B 8B

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Every value on this page was computed from “003f8b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.