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Recognised as Colour

#578BB2

  • #578BB2
  • Blue
  • Dark
  • Nearest: Steel blue

#578BB2 is a blue with RGB values 87, 139, 178 and HSL 206°, 37%, 52%. It is a dark colour, so black text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#578BB2#578BB2
HEX#578BB2
RGBrgb(87, 139, 178)
RGB (0–1)0.3412, 0.5451, 0.698
RGB percentages34.1%, 54.5%, 69.8%
HSLhsl(205.7, 37.1%, 52%)
HSV / HSBhsv(205.7, 51.1%, 69.8%)
CMYK51.1%, 21.9%, 0%, 30.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,737,394
CSS custom property--colour: #578BB2;

Brightness & contrast

Relative luminance0.23706WCAG 2.x, 0 is black and 1 is white
Perceived brightness131.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.74:1
Contrast with white3.66:1WCAG normal text: Fail
Contrast with black5.74:1WCAG normal text: AA
Greyscale equivalent#838383
Inverted#A8744D

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7A8BB4no red cones; affects about 1% of men; ΔE 10.5 from the original
Deuteranopia#6E82B1no green cones; the most common form, about 1% of men; ΔE 11.1 from the original
Tritanopia#279598no blue cones; rare, and affects men and women equally; ΔE 27.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.66:1WCAG large text: AA
Contrast with black, large text5.74:1WCAG large text: AAA

Named colours

Steel blue · ΔE 7.5Light slate grey · ΔE 15.2Slate grey · ΔE 16.1Cadetblue · ΔE 23.4Light skyblue · ΔE 24.5Sky blue · ΔE 25.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 7.5, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B27E57
Analogous#57B2AC, #575DB2
Triadic#B2578B, #8BB257
Split complementary#B2575D, #B2AB57
Tetradic#AC57B2, #B27E57, #5DB257

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E3ECF2
Lighter +30%#C0D3E2
Lighter +20%#9DBBD2
Lighter +10%#7AA3C2
Darker −10%#437193
Darker −20%#335670
Darker −30%#233B4D
Darker −40%#13202A
More saturated +25%#388FD1
Less saturated −25%#768793

Channel breakdown

R87
G139
B178
Red87 (34.1%)
Green139 (54.5%)
Blue178 (69.8%)
Hue205.71°
Saturation (HSL)37.14%
Lightness51.96%
Dominant channelBlue
Hex per channelR 57 · G 8B · B B2

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Every value on this page was computed from “578bb2” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.