Colour
#17181B
- #17181B
- Blue
- Dark
- Nearest: Black
#17181B is a blue with RGB values 23, 24, 27 and HSL 225°, 8%, 10%. It is a dark colour, so white text on it reaches 17.8:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#17181B#17181B
HEX#17181B
RGBrgb(23, 24, 27)
RGB (0–1)0.0902, 0.0941, 0.1059
RGB percentages9%, 9.4%, 10.6%
HSLhsl(225, 8%, 9.8%)
HSV / HSBhsv(225, 14.8%, 10.6%)
CMYK14.8%, 11.1%, 0%, 89.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,513,499
CSS custom property--colour: #17181B;
Brightness & contrast
Relative luminance0.00915WCAG 2.x, 0 is black and 1 is white
Perceived brightness24.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.75:1
Contrast with white17.75:1WCAG normal text: AAA
Contrast with black1.18:1WCAG normal text: Fail
Greyscale equivalent#181818
Inverted#E8E7E4
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.75:1WCAG large text: AAA
Contrast with black, large text1.18:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#1B1A17
Analogous#171A1B, #18171B
Triadic#1B1718, #181B17
Split complementary#1B1817, #1A1B17
Tetradic#1B171A, #1B1A17, #171B18
Tints, shades & saturation
Channel breakdown
R23
G24
B27
Red23 (9%)
Green24 (9.4%)
Blue27 (10.6%)
Hue225°
Saturation (HSL)8%
Lightness9.8%
Dominant channelBlue
Hex per channelR 17 · G 18 · B 1B
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