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Colour

#00388B

  • #00388B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#00388B is a blue with RGB values 0, 56, 139 and HSL 216°, 100%, 27%. It is a dark colour, so white text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#00388B#00388B
HEX#00388B
RGBrgb(0, 56, 139)
RGB (0–1)0, 0.2196, 0.5451
RGB percentages0%, 22%, 54.5%
HSLhsl(215.8, 100%, 27.3%)
HSV / HSBhsv(215.8, 100%, 54.5%)
CMYK100%, 59.7%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer14,475
CSS custom property--colour: #00388B;

Brightness & contrast

Relative luminance0.04692WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.83:1
Contrast with white10.83:1WCAG normal text: AAA
Contrast with black1.94:1WCAG normal text: Fail
Greyscale equivalent#323232
Inverted#FFC774

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00438Eno red cones; affects about 1% of men; ΔE 8.3 from the original
Deuteranopia#003789no green cones; the most common form, about 1% of men; ΔE 0.7 from the original
Tritanopia#004D5Bno blue cones; rare, and affects men and women equally; ΔE 50.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.83:1WCAG large text: AAA
Contrast with black, large text1.94:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.6Midnight blue · ΔE 15.8Rebecca purple · ΔE 24.6Slate blue · ΔE 26.6Royal blue · ΔE 27.4Indigo · ΔE 32.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.64, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B5300
Analogous#007D8B, #0D008B
Triadic#8B0038, #388B00
Split complementary#8B0E00, #7D8B00
Tetradic#8B007E, #8B5300, #008B0E

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#589BFF
Lighter +30%#257DFF
Lighter +20%#0061F1
Lighter +10%#004DBE
Darker −10%#002358
Darker −20%#000F25
Darker −30%#000000
Darker −40%#000000
More saturated +25%#00388B
Less saturated −25%#113B7A

Channel breakdown

R0
G56
B139
Red0 (0%)
Green56 (22%)
Blue139 (54.5%)
Hue215.83°
Saturation (HSL)100%
Lightness27.25%
Dominant channelBlue
Hex per channelR 00 · G 38 · B 8B

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Every value on this page was computed from “00388b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.