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Recognised as Colour

#578BE9

  • #578BE9
  • Blue
  • Dark
  • Nearest: Cornflower blue

#578BE9 is a blue with RGB values 87, 139, 233 and HSL 219°, 77%, 63%. It is a dark colour, so black text on it reaches 6.3:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#578BE9#578BE9
HEX#578BE9
RGBrgb(87, 139, 233)
RGB (0–1)0.3412, 0.5451, 0.9137
RGB percentages34.1%, 54.5%, 91.4%
HSLhsl(218.6, 76.8%, 62.7%)
HSV / HSBhsv(218.6, 62.7%, 91.4%)
CMYK62.7%, 40.3%, 0%, 8.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,737,449
CSS custom property--colour: #578BE9;

Brightness & contrast

Relative luminance0.26375WCAG 2.x, 0 is black and 1 is white
Perceived brightness140.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.27:1
Contrast with white3.35:1WCAG normal text: Fail
Contrast with black6.27:1WCAG normal text: AA
Greyscale equivalent#878787
Inverted#A87416

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6194EDno red cones; affects about 1% of men; ΔE 4.7 from the original
Deuteranopia#4C86E7no green cones; the most common form, about 1% of men; ΔE 2.9 from the original
Tritanopia#00A0AFno blue cones; rare, and affects men and women equally; ΔE 53.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.35:1WCAG large text: AA
Contrast with black, large text6.27:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 5.4Dodgerblue · ΔE 10.8Royal blue · ΔE 22Medium purple · ΔE 25.6Steel blue · ΔE 26.5Slate blue · ΔE 28.2
Nearest named CSS colourCornflower blue (#6495ED)ΔE 5.4, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#E9B557
Analogous#57D4E9, #6C57E9
Triadic#E9578B, #8BE957
Split complementary#E96C57, #D4E957
Tetradic#E957D4, #E9B557, #57E96C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#DEE8FB
Lighter +20%#B1C9F5
Lighter +10%#84AAEF
Darker −10%#2A6CE3
Darker −20%#1955C1
Darker −30%#134194
Darker −40%#0D2D67
More saturated +25%#4185FF
Less saturated −25%#6F92D1

Channel breakdown

R87
G139
B233
Red87 (34.1%)
Green139 (54.5%)
Blue233 (91.4%)
Hue218.63°
Saturation (HSL)76.84%
Lightness62.75%
Dominant channelBlue
Hex per channelR 57 · G 8B · B E9

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Every value on this page was computed from “578be9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.