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Recognised as Colour

#00399B

  • #00399B
  • Blue
  • Dark
  • Nearest: Midnight blue

#00399B is a blue with RGB values 0, 57, 155 and HSL 218°, 100%, 30%. It is a dark colour, so white text on it reaches 10.2:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#00399B#00399B
HEX#00399B
RGBrgb(0, 57, 155)
RGB (0–1)0, 0.2235, 0.6078
RGB percentages0%, 22.4%, 60.8%
HSLhsl(217.9, 100%, 30.4%)
HSV / HSBhsv(217.9, 100%, 60.8%)
CMYK100%, 63.2%, 0%, 39.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer14,747
CSS custom property--colour: #00399B;

Brightness & contrast

Relative luminance0.05293WCAG 2.x, 0 is black and 1 is white
Perceived brightness68.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.2:1
Contrast with white10.2:1WCAG normal text: AAA
Contrast with black2.06:1WCAG normal text: Fail
Greyscale equivalent#343434
Inverted#FFC664

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00489Eno red cones; affects about 1% of men; ΔE 11.6 from the original
Deuteranopia#003B99no green cones; the most common form, about 1% of men; ΔE 2.9 from the original
Tritanopia#005364no blue cones; rare, and affects men and women equally; ΔE 58.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.2:1WCAG large text: AAA
Contrast with black, large text2.06:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 15.3Dark slateblue · ΔE 15.7Slate blue · ΔE 20.6Rebecca purple · ΔE 20.8Royal blue · ΔE 21.8Navy · ΔE 27.3
Nearest named CSS colourMidnight blue (#191970)ΔE 15.34, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9B6200
Analogous#00869B, #15009B
Triadic#9B0039, #399B00
Split complementary#9B1500, #869B00
Tetradic#9B0086, #9B6200, #009B15

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#68A0FF
Lighter +30%#357FFF
Lighter +20%#025FFF
Lighter +10%#004CCE
Darker −10%#002668
Darker −20%#001335
Darker −30%#000102
Darker −40%#000000
More saturated +25%#00399B
Less saturated −25%#133E88

Channel breakdown

R0
G57
B155
Red0 (0%)
Green57 (22.4%)
Blue155 (60.8%)
Hue217.94°
Saturation (HSL)100%
Lightness30.39%
Dominant channelBlue
Hex per channelR 00 · G 39 · B 9B

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Every value on this page was computed from “00399b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.