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Recognised as Colour

#577DB2

  • #577DB2
  • Blue
  • Dark
  • Nearest: Steel blue

#577DB2 is a blue with RGB values 87, 125, 178 and HSL 215°, 37%, 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

#577DB2#577DB2
HEX#577DB2
RGBrgb(87, 125, 178)
RGB (0–1)0.3412, 0.4902, 0.698
RGB percentages34.1%, 49%, 69.8%
HSLhsl(214.9, 37.1%, 52%)
HSV / HSBhsv(214.9, 51.1%, 69.8%)
CMYK51.1%, 29.8%, 0%, 30.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,733,810
CSS custom property--colour: #577DB2;

Brightness & contrast

Relative luminance0.19908WCAG 2.x, 0 is black and 1 is white
Perceived brightness122.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.98:1
Contrast with white4.22:1WCAG normal text: Fail
Contrast with black4.98:1WCAG normal text: AA
Greyscale equivalent#797979
Inverted#A8824D

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6880B4no red cones; affects about 1% of men; ΔE 4.2 from the original
Deuteranopia#5D77B1no green cones; the most common form, about 1% of men; ΔE 5.2 from the original
Tritanopia#2B8990no blue cones; rare, and affects men and women equally; ΔE 33.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.22:1WCAG large text: AA
Contrast with black, large text4.98:1WCAG large text: AAA

Named colours

Steel blue · ΔE 6Cornflower blue · ΔE 21.3Light slate grey · ΔE 21.8Slate grey · ΔE 22Deep skyblue · ΔE 30.4Light skyblue · ΔE 31
Nearest named CSS colourSteel blue (#4682B4)ΔE 6.05, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B28C57
Analogous#57AAB2, #5E57B2
Triadic#B2577D, #7DB257
Split complementary#B25E57, #AAB257
Tetradic#B257AB, #B28C57, #57B25F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E3E9F2
Lighter +30%#C0CEE2
Lighter +20%#9DB3D2
Lighter +10%#7A98C2
Darker −10%#436493
Darker −20%#334D70
Darker −30%#23354D
Darker −40%#131D2A
More saturated +25%#3878D1
Less saturated −25%#768293

Channel breakdown

R87
G125
B178
Red87 (34.1%)
Green125 (49%)
Blue178 (69.8%)
Hue214.95°
Saturation (HSL)37.14%
Lightness51.96%
Dominant channelBlue
Hex per channelR 57 · G 7D · B B2

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Every value on this page was computed from “577db2” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.