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Recognised as Colour

#175B51

  • #175B51
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#175B51 is a cyan with RGB values 23, 91, 81 and HSL 171°, 60%, 22%. It is a dark colour, so white text on it reaches 7.9:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#175B51#175B51
HEX#175B51
RGBrgb(23, 91, 81)
RGB (0–1)0.0902, 0.3569, 0.3176
RGB percentages9%, 35.7%, 31.8%
HSLhsl(171.2, 59.6%, 22.4%)
HSV / HSBhsv(171.2, 74.7%, 35.7%)
CMYK74.7%, 0%, 11%, 64.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,530,705
CSS custom property--colour: #175B51;

Brightness & contrast

Relative luminance0.08258WCAG 2.x, 0 is black and 1 is white
Perceived brightness75.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.92:1
Contrast with white7.92:1WCAG normal text: AAA
Contrast with black2.65:1WCAG normal text: Fail
Greyscale equivalent#4C4C4C
Inverted#E8A4AE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#575551no red cones; affects about 1% of men; ΔE 23.6 from the original
Deuteranopia#4D4E52no green cones; the most common form, about 1% of men; ΔE 24 from the original
Tritanopia#005D58no blue cones; rare, and affects men and women equally; ΔE 3.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.92:1WCAG large text: AAA
Contrast with black, large text2.65:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 12.6Teal · ΔE 16.9Dark cyan · ΔE 21Dim grey · ΔE 25.4Cadetblue · ΔE 27.8Slate grey · ΔE 29.9
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 12.62, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5B1721
Analogous#175B2F, #17435B
Triadic#51175B, #5B5117
Split complementary#5B1743, #5B2F17
Tetradic#2F175B, #5B1721, #435B17

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#66D8C7
Lighter +30%#3DCEB9
Lighter +20%#2CAC99
Lighter +10%#218475
Darker −10%#0D322D
Darker −20%#020A09
Darker −30%#000000
Darker −40%#000000
More saturated +25%#09695B
Less saturated −25%#254D47

Channel breakdown

R23
G91
B81
Red23 (9%)
Green91 (35.7%)
Blue81 (31.8%)
Hue171.18°
Saturation (HSL)59.65%
Lightness22.35%
Dominant channelGreen
Hex per channelR 17 · G 5B · B 51

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Every value on this page was computed from “175b51” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.