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Recognised as Colour

#578CAB

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

#578CAB is a blue with RGB values 87, 140, 171 and HSL 202°, 33%, 51%. 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

#578CAB#578CAB
HEX#578CAB
RGBrgb(87, 140, 171)
RGB (0–1)0.3412, 0.549, 0.6706
RGB percentages34.1%, 54.9%, 67.1%
HSLhsl(202.1, 33.3%, 50.6%)
HSV / HSBhsv(202.1, 49.1%, 67.1%)
CMYK49.1%, 18.1%, 0%, 32.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,737,643
CSS custom property--colour: #578CAB;

Brightness & contrast

Relative luminance0.23723WCAG 2.x, 0 is black and 1 is white
Perceived brightness130.8 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#A87354

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7E8BADno red cones; affects about 1% of men; ΔE 12.5 from the original
Deuteranopia#7282ABno green cones; the most common form, about 1% of men; ΔE 13.3 from the original
Tritanopia#2D9496no blue cones; rare, and affects men and women equally; ΔE 22.5 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 11.9Light slate grey · ΔE 12.6Slate grey · ΔE 13.4Cadetblue · ΔE 18.7Gray · ΔE 23.6Sky blue · ΔE 24.1
Nearest named CSS colourSteel blue (#4682B4)ΔE 11.94, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AB7657
Analogous#57ABA0, #5762AB
Triadic#AB578C, #8CAB57
Split complementary#AB5762, #ABA057
Tetradic#A057AB, #AB7657, #62AB57

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DFE9EF
Lighter +30%#BDD2DE
Lighter +20%#9BBBCD
Lighter +10%#79A3BC
Darker −10%#45718A
Darker −20%#345568
Darker −30%#233946
Darker −40%#121D24
More saturated +25%#3894CB
Less saturated −25%#77848B

Channel breakdown

R87
G140
B171
Red87 (34.1%)
Green140 (54.9%)
Blue171 (67.1%)
Hue202.14°
Saturation (HSL)33.33%
Lightness50.59%
Dominant channelBlue
Hex per channelR 57 · G 8C · B AB

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