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Recognised as Colour

#578BCB

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

#578BCB is a blue with RGB values 87, 139, 203 and HSL 213°, 53%, 57%. 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

#578BCB#578BCB
HEX#578BCB
RGBrgb(87, 139, 203)
RGB (0–1)0.3412, 0.5451, 0.7961
RGB percentages34.1%, 54.5%, 79.6%
HSLhsl(213.1, 52.7%, 56.9%)
HSV / HSBhsv(213.1, 57.1%, 79.6%)
CMYK57.1%, 31.5%, 0%, 20.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,737,419
CSS custom property--colour: #578BCB;

Brightness & contrast

Relative luminance0.24803WCAG 2.x, 0 is black and 1 is white
Perceived brightness135.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.96:1
Contrast with white3.52:1WCAG normal text: Fail
Contrast with black5.96:1WCAG normal text: AA
Greyscale equivalent#858585
Inverted#A87434

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#718FCEno red cones; affects about 1% of men; ΔE 5.9 from the original
Deuteranopia#6283CAno green cones; the most common form, about 1% of men; ΔE 7.3 from the original
Tritanopia#009AA2no blue cones; rare, and affects men and women equally; ΔE 40.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.52:1WCAG large text: AA
Contrast with black, large text5.96:1WCAG large text: AAA

Named colours

Steel blue · ΔE 9.5Cornflower blue · ΔE 14.3Deep skyblue · ΔE 25.2Dodgerblue · ΔE 26.5Light slate grey · ΔE 27.5Light skyblue · ΔE 27.8
Nearest named CSS colourSteel blue (#4682B4)ΔE 9.46, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CB9757
Analogous#57C5CB, #5D57CB
Triadic#CB578B, #8BCB57
Split complementary#CB5D57, #C5CB57
Tetradic#CB57C5, #CB9757, #57CB5D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F3F7FB
Lighter +30%#CCDCEF
Lighter +20%#A5C1E3
Lighter +10%#7EA6D7
Darker −10%#3871B7
Darker −20%#2C5990
Darker −30%#204169
Darker −40%#142942
More saturated +25%#3C88E6
Less saturated −25%#738EB0

Channel breakdown

R87
G139
B203
Red87 (34.1%)
Green139 (54.5%)
Blue203 (79.6%)
Hue213.1°
Saturation (HSL)52.73%
Lightness56.86%
Dominant channelBlue
Hex per channelR 57 · G 8B · B CB

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