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Recognised as Colour

#577DB4

  • #577DB4
  • Blue
  • Dark
  • Nearest: Steel blue

#577DB4 is a blue with RGB values 87, 125, 180 and HSL 215°, 38%, 52%. It is a dark colour, so black text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#577DB4#577DB4
HEX#577DB4
RGBrgb(87, 125, 180)
RGB (0–1)0.3412, 0.4902, 0.7059
RGB percentages34.1%, 49%, 70.6%
HSLhsl(215.5, 38.3%, 52.4%)
HSV / HSBhsv(215.5, 51.7%, 70.6%)
CMYK51.7%, 30.6%, 0%, 29.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,733,812
CSS custom property--colour: #577DB4;

Brightness & contrast

Relative luminance0.19989WCAG 2.x, 0 is black and 1 is white
Perceived brightness123 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5:1
Contrast with white4.2:1WCAG normal text: Fail
Contrast with black5:1WCAG normal text: AA
Greyscale equivalent#797979
Inverted#A8824B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6780B6no red cones; affects about 1% of men; ΔE 3.9 from the original
Deuteranopia#5C78B3no green cones; the most common form, about 1% of men; ΔE 4.3 from the original
Tritanopia#298990no blue cones; rare, and affects men and women equally; ΔE 34.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.2:1WCAG large text: AA
Contrast with black, large text5:1WCAG large text: AAA

Named colours

Steel blue · ΔE 6.7Cornflower blue · ΔE 20.2Light slate grey · ΔE 22.9Slate grey · ΔE 23.1Deep skyblue · ΔE 30.4Light skyblue · ΔE 31.3
Nearest named CSS colourSteel blue (#4682B4)ΔE 6.73, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B48E57
Analogous#57ABB4, #6057B4
Triadic#B4577D, #7DB457
Split complementary#B46057, #ACB457
Tetradic#B457AB, #B48E57, #57B460

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E4EAF3
Lighter +30%#C1CFE3
Lighter +20%#9EB4D3
Lighter +10%#7A98C4
Darker −10%#436495
Darker −20%#334D72
Darker −30%#23354F
Darker −40%#131D2C
More saturated +25%#3977D2
Less saturated −25%#758396

Channel breakdown

R87
G125
B180
Red87 (34.1%)
Green125 (49%)
Blue180 (70.6%)
Hue215.48°
Saturation (HSL)38.27%
Lightness52.35%
Dominant channelBlue
Hex per channelR 57 · G 7D · B B4

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Every value on this page was computed from “577db4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.