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Recognised as Colour

#577F81

  • #577F81
  • Cyan
  • Dark
  • Nearest: Slate grey

#577F81 is a cyan with RGB values 87, 127, 129 and HSL 183°, 19%, 42%. It is a dark colour, so black text on it reaches 4.8:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#577F81#577F81
HEX#577F81
RGBrgb(87, 127, 129)
RGB (0–1)0.3412, 0.498, 0.5059
RGB percentages34.1%, 49.8%, 50.6%
HSLhsl(182.9, 19.4%, 42.4%)
HSV / HSBhsv(182.9, 32.6%, 50.6%)
CMYK32.6%, 1.6%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,734,273
CSS custom property--colour: #577F81;

Brightness & contrast

Relative luminance0.1879WCAG 2.x, 0 is black and 1 is white
Perceived brightness116.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.76:1
Contrast with white4.41:1WCAG normal text: Fail
Contrast with black4.76:1WCAG normal text: AA
Greyscale equivalent#777777
Inverted#A8807E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7A7B81no red cones; affects about 1% of men; ΔE 14.4 from the original
Deuteranopia#727681no green cones; the most common form, about 1% of men; ΔE 14.2 from the original
Tritanopia#48827Fno blue cones; rare, and affects men and women equally; ΔE 6.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.41:1WCAG large text: AA
Contrast with black, large text4.76:1WCAG large text: AAA

Named colours

Slate grey · ΔE 12.5Cadetblue · ΔE 12.6Light slate grey · ΔE 13.5Gray · ΔE 14.8Dim grey · ΔE 15.6Teal · ΔE 16
Nearest named CSS colourSlate grey (#708090)ΔE 12.49, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#815957
Analogous#57816E, #576A81
Triadic#81577F, #7F8157
Split complementary#81576A, #816E57
Tetradic#6E5781, #815957, #6A8157

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9DADB
Lighter +30%#ABC5C6
Lighter +20%#8CB0B2
Lighter +10%#6E9B9D
Darker −10%#426163
Darker −20%#2E4344
Darker −30%#192526
Darker −40%#050707
More saturated +25%#3C979C
Less saturated −25%#6C6C6C

Channel breakdown

R87
G127
B129
Red87 (34.1%)
Green127 (49.8%)
Blue129 (50.6%)
Hue182.86°
Saturation (HSL)19.44%
Lightness42.35%
Dominant channelBlue
Hex per channelR 57 · G 7F · B 81

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Every value on this page was computed from “577f81” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.