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Recognised as Colour

#173F51

  • #173F51
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#173F51 is a cyan with RGB values 23, 63, 81 and HSL 199°, 56%, 20%. It is a dark colour, so white text on it reaches 11.3:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#173F51#173F51
HEX#173F51
RGBrgb(23, 63, 81)
RGB (0–1)0.0902, 0.2471, 0.3176
RGB percentages9%, 24.7%, 31.8%
HSLhsl(198.6, 55.8%, 20.4%)
HSV / HSBhsv(198.6, 71.6%, 31.8%)
CMYK71.6%, 22.2%, 0%, 68.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,537
CSS custom property--colour: #173F51;

Brightness & contrast

Relative luminance0.04331WCAG 2.x, 0 is black and 1 is white
Perceived brightness56.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.25:1
Contrast with white11.25:1WCAG normal text: AAA
Contrast with black1.87:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E8C0AE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#363E52no red cones; affects about 1% of men; ΔE 9.9 from the original
Deuteranopia#2E3851no green cones; the most common form, about 1% of men; ΔE 10.8 from the original
Tritanopia#004445no blue cones; rare, and affects men and women equally; ΔE 14 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.25:1WCAG large text: AAA
Contrast with black, large text1.87:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 13.7Dim grey · ΔE 25.8Slate grey · ΔE 28.9Black · ΔE 29.9Light slate grey · ΔE 31.8Teal · ΔE 32.5
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 13.71, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#512917
Analogous#175146, #172251
Triadic#51173F, #3F5117
Split complementary#511722, #514617
Tetradic#461751, #512917, #225117

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#62AFD2
Lighter +30%#3A9BC7
Lighter +20%#2E7DA0
Lighter +10%#225E79
Darker −10%#0C2029
Darker −20%#000102
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A445E
Less saturated −25%#243A44

Channel breakdown

R23
G63
B81
Red23 (9%)
Green63 (24.7%)
Blue81 (31.8%)
Hue198.62°
Saturation (HSL)55.77%
Lightness20.39%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 51

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Every value on this page was computed from “173f51” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.