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Recognised as Colour

#577C81

  • #577C81
  • Cyan
  • Dark
  • Nearest: Slate grey

#577C81 is a cyan with RGB values 87, 124, 129 and HSL 187°, 19%, 42%. It is a dark colour, so black text on it reaches 4.6:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#577C81#577C81
HEX#577C81
RGBrgb(87, 124, 129)
RGB (0–1)0.3412, 0.4863, 0.5059
RGB percentages34.1%, 48.6%, 50.6%
HSLhsl(187.1, 19.4%, 42.4%)
HSV / HSBhsv(187.1, 32.6%, 50.6%)
CMYK32.6%, 3.9%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,733,505
CSS custom property--colour: #577C81;

Brightness & contrast

Relative luminance0.18027WCAG 2.x, 0 is black and 1 is white
Perceived brightness114.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.61:1
Contrast with white4.56:1WCAG normal text: AA
Contrast with black4.61:1WCAG normal text: AA
Greyscale equivalent#747474
Inverted#A8837E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#767981no red cones; affects about 1% of men; ΔE 12.5 from the original
Deuteranopia#6F7381no green cones; the most common form, about 1% of men; ΔE 13.3 from the original
Tritanopia#487F7Dno blue cones; rare, and affects men and women equally; ΔE 7.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.56:1WCAG large text: AAA
Contrast with black, large text4.61:1WCAG large text: AAA

Named colours

Slate grey · ΔE 10.7Light slate grey · ΔE 12.1Gray · ΔE 14.1Cadetblue · ΔE 14.1Dim grey · ΔE 14.5Teal · ΔE 17.3
Nearest named CSS colourSlate grey (#708090)ΔE 10.71, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#815C57
Analogous#578171, #576781
Triadic#81577C, #7C8157
Split complementary#815767, #817157
Tetradic#715781, #815C57, #678157

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9D9DB
Lighter +30%#ABC3C6
Lighter +20%#8CADB2
Lighter +10%#6E989D
Darker −10%#425F63
Darker −20%#2E4144
Darker −30%#192426
Darker −40%#050707
More saturated +25%#3C919C
Less saturated −25%#6C6C6C

Channel breakdown

R87
G124
B129
Red87 (34.1%)
Green124 (48.6%)
Blue129 (50.6%)
Hue187.14°
Saturation (HSL)19.44%
Lightness42.35%
Dominant channelBlue
Hex per channelR 57 · G 7C · B 81

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Every value on this page was computed from “577c81” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.