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Recognised as Colour

#578FB5

  • #578FB5
  • Blue
  • Dark
  • Nearest: Steel blue

#578FB5 is a blue with RGB values 87, 143, 181 and HSL 204°, 39%, 53%. It is a dark colour, so black text on it reaches 6:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#578FB5#578FB5
HEX#578FB5
RGBrgb(87, 143, 181)
RGB (0–1)0.3412, 0.5608, 0.7098
RGB percentages34.1%, 56.1%, 71%
HSLhsl(204.3, 38.8%, 52.5%)
HSV / HSBhsv(204.3, 51.9%, 71%)
CMYK51.9%, 21%, 0%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,738,421
CSS custom property--colour: #578FB5;

Brightness & contrast

Relative luminance0.25007WCAG 2.x, 0 is black and 1 is white
Perceived brightness134.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6:1
Contrast with white3.5:1WCAG normal text: Fail
Contrast with black6:1WCAG normal text: AA
Greyscale equivalent#868686
Inverted#A8704A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7E8FB7no red cones; affects about 1% of men; ΔE 11.6 from the original
Deuteranopia#7185B4no green cones; the most common form, about 1% of men; ΔE 12.4 from the original
Tritanopia#22999Cno blue cones; rare, and affects men and women equally; ΔE 26.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.5:1WCAG large text: AA
Contrast with black, large text6:1WCAG large text: AAA

Named colours

Steel blue · ΔE 8.8Light slate grey · ΔE 15.4Slate grey · ΔE 16.5Cadetblue · ΔE 22.2Light skyblue · ΔE 23.1Sky blue · ΔE 23.7
Nearest named CSS colourSteel blue (#4682B4)ΔE 8.82, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B57D57
Analogous#57B5AC, #5760B5
Triadic#B5578F, #8FB557
Split complementary#B55760, #B5AC57
Tetradic#AC57B5, #B57D57, #60B557

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E5EDF3
Lighter +30%#C1D6E4
Lighter +20%#9EBED4
Lighter +10%#7AA7C5
Darker −10%#427597
Darker −20%#335973
Darker −30%#233E50
Darker −40%#14222C
More saturated +25%#3995D3
Less saturated −25%#758997

Channel breakdown

R87
G143
B181
Red87 (34.1%)
Green143 (56.1%)
Blue181 (71%)
Hue204.26°
Saturation (HSL)38.84%
Lightness52.55%
Dominant channelBlue
Hex per channelR 57 · G 8F · B B5

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Every value on this page was computed from “578fb5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.