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Recognised as Colour

#173F4E

  • #173F4E
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#173F4E is a cyan with RGB values 23, 63, 78 and HSL 196°, 54%, 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

#173F4E#173F4E
HEX#173F4E
RGBrgb(23, 63, 78)
RGB (0–1)0.0902, 0.2471, 0.3059
RGB percentages9%, 24.7%, 30.6%
HSLhsl(196.4, 54.5%, 19.8%)
HSV / HSBhsv(196.4, 70.5%, 30.6%)
CMYK70.5%, 19.2%, 0%, 69.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,523,534
CSS custom property--colour: #173F4E;

Brightness & contrast

Relative luminance0.04287WCAG 2.x, 0 is black and 1 is white
Perceived brightness56.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.31:1
Contrast with white11.31:1WCAG normal text: AAA
Contrast with black1.86:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E8C0B1

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#373E4Fno red cones; affects about 1% of men; ΔE 10.5 from the original
Deuteranopia#2F384Eno green cones; the most common form, about 1% of men; ΔE 11.3 from the original
Tritanopia#004344no blue cones; rare, and affects men and women equally; ΔE 11.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.31:1WCAG large text: AAA
Contrast with black, large text1.86:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 12Dim grey · ΔE 25.3Slate grey · ΔE 29.1Black · ΔE 29.2Teal · ΔE 31.5Light slate grey · ΔE 32
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 12.04, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4E2617
Analogous#174E42, #17234E
Triadic#4E173F, #3F4E17
Split complementary#4E1724, #4E4217
Tetradic#42174E, #4E2617, #234E17

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#61B2D0
Lighter +30%#3A9EC4
Lighter +20%#2E7F9D
Lighter +10%#235F75
Darker −10%#0B1F27
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A455B
Less saturated −25%#243941

Channel breakdown

R23
G63
B78
Red23 (9%)
Green63 (24.7%)
Blue78 (30.6%)
Hue196.36°
Saturation (HSL)54.46%
Lightness19.8%
Dominant channelBlue
Hex per channelR 17 · G 3F · B 4E

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Every value on this page was computed from “173f4e” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.