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Recognised as Colour

#578C8B

  • #578C8B
  • Cyan
  • Dark
  • Nearest: Cadetblue

#578C8B is a cyan with RGB values 87, 140, 139 and HSL 179°, 23%, 45%. It is a dark colour, so black text on it reaches 5.5:1 contrast (AA for normal text). The nearest named colour is Cadetblue.

Colour values

#578C8B#578C8B
HEX#578C8B
RGBrgb(87, 140, 139)
RGB (0–1)0.3412, 0.549, 0.5451
RGB percentages34.1%, 54.9%, 54.5%
HSLhsl(178.9, 23.3%, 44.5%)
HSV / HSBhsv(178.9, 37.9%, 54.9%)
CMYK37.9%, 0%, 0.7%, 45.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,737,611
CSS custom property--colour: #578C8B;

Brightness & contrast

Relative luminance0.22646WCAG 2.x, 0 is black and 1 is white
Perceived brightness126.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.53:1
Contrast with white3.8:1WCAG normal text: Fail
Contrast with black5.53:1WCAG normal text: AA
Greyscale equivalent#818181
Inverted#A87374

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#86878Bno red cones; affects about 1% of men; ΔE 18.5 from the original
Deuteranopia#7C808Cno green cones; the most common form, about 1% of men; ΔE 19 from the original
Tritanopia#418F8Cno blue cones; rare, and affects men and women equally; ΔE 6.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.8:1WCAG large text: AA
Contrast with black, large text5.53:1WCAG large text: AAA

Named colours

Cadetblue · ΔE 7.1Teal · ΔE 13.2Dark cyan · ΔE 13.6Slate grey · ΔE 16.7Light slate grey · ΔE 16.7Gray · ΔE 18.5
Nearest named CSS colourCadetblue (#5F9EA0)ΔE 7.12, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8C5758
Analogous#578C70, #57738C
Triadic#8B578C, #8C8B57
Split complementary#8C5773, #8C7057
Tetradic#70578C, #8C5758, #738C57

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CEE1E0
Lighter +30%#AFCDCD
Lighter +20%#8FBAB9
Lighter +10%#70A6A5
Darker −10%#436D6C
Darker −20%#304D4D
Darker −30%#1C2E2D
Darker −40%#090E0E
More saturated +25%#3BA8A6
Less saturated −25%#727272

Channel breakdown

R87
G140
B139
Red87 (34.1%)
Green140 (54.9%)
Blue139 (54.5%)
Hue178.87°
Saturation (HSL)23.35%
Lightness44.51%
Dominant channelGreen
Hex per channelR 57 · G 8C · B 8B

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Every value on this page was computed from “578c8b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.