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Recognised as Colour

#42588B

  • #42588B
  • Blue
  • Dark
  • Nearest: Steel blue

#42588B is a blue with RGB values 66, 88, 139 and HSL 222°, 36%, 40%. It is a dark colour, so white text on it reaches 7:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#42588B#42588B
HEX#42588B
RGBrgb(66, 88, 139)
RGB (0–1)0.2588, 0.3451, 0.5451
RGB percentages25.9%, 34.5%, 54.5%
HSLhsl(221.9, 35.6%, 40.2%)
HSV / HSBhsv(221.9, 52.5%, 54.5%)
CMYK52.5%, 36.7%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,348,043
CSS custom property--colour: #42588B;

Brightness & contrast

Relative luminance0.10002WCAG 2.x, 0 is black and 1 is white
Perceived brightness89.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7:1
Contrast with white7:1WCAG normal text: AA
Contrast with black3:1WCAG normal text: Fail
Greyscale equivalent#575757
Inverted#BDA774

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#445D8Dno red cones; affects about 1% of men; ΔE 3 from the original
Deuteranopia#3C568Ano green cones; the most common form, about 1% of men; ΔE 1.5 from the original
Tritanopia#20636Bno blue cones; rare, and affects men and women equally; ΔE 32.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7:1WCAG large text: AAA
Contrast with black, large text3:1WCAG large text: AA

Named colours

Steel blue · ΔE 18.4Dark slateblue · ΔE 23.1Slate grey · ΔE 26.9Light slate grey · ΔE 28.4Cornflower blue · ΔE 30.4Dim grey · ΔE 32.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 18.4, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B7542
Analogous#427C8B, #51428B
Triadic#8B4258, #588B42
Split complementary#8B5142, #7D8B42
Tetradic#8B427C, #8B7542, #428B51

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BBC5DE
Lighter +30%#98A8CE
Lighter +20%#758BBE
Lighter +10%#536EAD
Darker −10%#324268
Darker −20%#212C46
Darker −30%#111623
Darker −40%#000001
More saturated +25%#284EA5
Less saturated −25%#5C6271

Channel breakdown

R66
G88
B139
Red66 (25.9%)
Green88 (34.5%)
Blue139 (54.5%)
Hue221.92°
Saturation (HSL)35.61%
Lightness40.2%
Dominant channelBlue
Hex per channelR 42 · G 58 · B 8B

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Every value on this page was computed from “42588b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.