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Recognised as Colour

#40588B

  • #40588B
  • Blue
  • Dark
  • Nearest: Steel blue

#40588B is a blue with RGB values 64, 88, 139 and HSL 221°, 37%, 40%. It is a dark colour, so white text on it reaches 7:1 contrast (AAA for normal text). The nearest named colour is Steel blue.

Colour values

#40588B#40588B
HEX#40588B
RGBrgb(64, 88, 139)
RGB (0–1)0.251, 0.3451, 0.5451
RGB percentages25.1%, 34.5%, 54.5%
HSLhsl(220.8, 36.9%, 39.8%)
HSV / HSBhsv(220.8, 54%, 54.5%)
CMYK54%, 36.7%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,216,971
CSS custom property--colour: #40588B;

Brightness & contrast

Relative luminance0.09934WCAG 2.x, 0 is black and 1 is white
Perceived brightness89.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.03:1
Contrast with white7.03:1WCAG normal text: AAA
Contrast with black2.99:1WCAG normal text: Fail
Greyscale equivalent#575757
Inverted#BFA774

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#445C8Dno red cones; affects about 1% of men; ΔE 2.1 from the original
Deuteranopia#3B568Ano green cones; the most common form, about 1% of men; ΔE 1.3 from the original
Tritanopia#1B636Bno blue cones; rare, and affects men and women equally; ΔE 32.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.03:1WCAG large text: AAA
Contrast with black, large text2.99:1WCAG large text: Fail

Named colours

Steel blue · ΔE 18.2Dark slateblue · ΔE 23.4Slate grey · ΔE 27Light slate grey · ΔE 28.4Cornflower blue · ΔE 30.4Dim grey · ΔE 32.5
Nearest named CSS colourSteel blue (#4682B4)ΔE 18.2, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B7340
Analogous#407E8B, #4D408B
Triadic#8B4058, #588B40
Split complementary#8B4D40, #7E8B40
Tetradic#8B407E, #8B7340, #408B4D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B8C5DF
Lighter +30%#96A8CE
Lighter +20%#738BBE
Lighter +10%#506EAE
Darker −10%#304268
Darker −20%#202C45
Darker −30%#101622
Darker −40%#000000
More saturated +25%#274FA4
Less saturated −25%#596172

Channel breakdown

R64
G88
B139
Red64 (25.1%)
Green88 (34.5%)
Blue139 (54.5%)
Hue220.8°
Saturation (HSL)36.95%
Lightness39.8%
Dominant channelBlue
Hex per channelR 40 · G 58 · B 8B

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Every value on this page was computed from “40588b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.