Recognised as Colour
#173B40
- #173B40
- Cyan
- Dark
- Nearest: Dark slate grey
#173B40 is a cyan with RGB values 23, 59, 64 and HSL 187°, 47%, 17%. It is a dark colour, so white text on it reaches 12.1:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.
Colour values
#173B40#173B40
HEX#173B40
RGBrgb(23, 59, 64)
RGB (0–1)0.0902, 0.2314, 0.251
RGB percentages9%, 23.1%, 25.1%
HSLhsl(187.3, 47.1%, 17.1%)
HSV / HSBhsv(187.3, 64.1%, 25.1%)
CMYK64.1%, 7.8%, 0%, 74.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,496
CSS custom property--colour: #173B40;
Brightness & contrast
Relative luminance0.0368WCAG 2.x, 0 is black and 1 is white
Perceived brightness51.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.1:1
Contrast with white12.1:1WCAG normal text: AAA
Contrast with black1.74:1WCAG normal text: Fail
Greyscale equivalent#343434
Inverted#E8C4BF
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text12.1:1WCAG large text: AAA
Contrast with black, large text1.74:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#401C17
Analogous#174030, #172740
Triadic#40173B, #3B4017
Split complementary#401727, #403117
Tetradic#301740, #401C17, #274017
Tints, shades & saturation
Channel breakdown
R23
G59
B64
Red23 (9%)
Green59 (23.1%)
Blue64 (25.1%)
Hue187.32°
Saturation (HSL)47.13%
Lightness17.06%
Dominant channelBlue
Hex per channelR 17 · G 3B · B 40
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