Colour
#00008B
- #00008B
- Blue
- Dark
- Named: Dark blue
#00008B is the CSS colour blue with RGB values 0, 0, 139 and HSL 240°, 100%, 27%. It is a dark colour, so white text on it reaches 15.3:1 contrast (AAA for normal text). The nearest named colour is Dark blue.
Colour values
#00008B#00008B
HEX#00008B
RGBrgb(0, 0, 139)
RGB (0–1)0, 0, 0.5451
RGB percentages0%, 0%, 54.5%
HSLhsl(240, 100%, 27.3%)
HSV / HSBhsv(240, 100%, 54.5%)
CMYK100%, 100%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer139
CSS custom property--colour: #00008B;
Brightness & contrast
Relative luminance0.01864WCAG 2.x, 0 is black and 1 is white
Perceived brightness46.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.3:1
Contrast with white15.3:1WCAG normal text: AAA
Contrast with black1.37:1WCAG normal text: Fail
Greyscale equivalent#0A0A0A
Inverted#FFFF74
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text15.3:1WCAG large text: AAA
Contrast with black, large text1.37:1WCAG large text: Fail
Named colours
Colour harmonies
Complementary#8B8B00
Analogous#00468B, #46008B
Triadic#8B0000, #008B00
Split complementary#8B4600, #468B00
Tetradic#8B0046, #8B8B00, #008B46
Tints, shades & saturation
Channel breakdown
R0
G0
B139
Red0 (0%)
Green0 (0%)
Blue139 (54.5%)
Hue240°
Saturation (HSL)100%
Lightness27.25%
Dominant channelBlue
Hex per channelR 00 · G 00 · B 8B
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