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Recognised as Colour

#28589D

  • #28589D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#28589D is a blue with RGB values 40, 88, 157 and HSL 215°, 59%, 39%. It is a dark colour, so white text on it reaches 7.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#28589D#28589D
HEX#28589D
RGBrgb(40, 88, 157)
RGB (0–1)0.1569, 0.3451, 0.6157
RGB percentages15.7%, 34.5%, 61.6%
HSLhsl(215.4, 59.4%, 38.6%)
HSV / HSBhsv(215.4, 74.5%, 61.6%)
CMYK74.5%, 43.9%, 0%, 38.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,644,125
CSS custom property--colour: #28589D;

Brightness & contrast

Relative luminance0.09865WCAG 2.x, 0 is black and 1 is white
Perceived brightness88.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.06:1
Contrast with white7.06:1WCAG normal text: AAA
Contrast with black2.97:1WCAG normal text: Fail
Greyscale equivalent#535353
Inverted#D7A762

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#365EA0no red cones; affects about 1% of men; ΔE 3.4 from the original
Deuteranopia#21539Cno green cones; the most common form, about 1% of men; ΔE 3.5 from the original
Tritanopia#006873no blue cones; rare, and affects men and women equally; ΔE 41.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.06:1WCAG large text: AAA
Contrast with black, large text2.97:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 18.8Steel blue · ΔE 21.9Cornflower blue · ΔE 25.3Dodgerblue · ΔE 30.4Royal blue · ΔE 30.8Slate blue · ΔE 32.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 18.81, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9D6D28
Analogous#28939D, #32289D
Triadic#9D2858, #589D28
Split complementary#9D3228, #939D28
Tetradic#9D2893, #9D6D28, #289D32

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A8C3E9
Lighter +30%#7FA6DF
Lighter +20%#578AD4
Lighter +10%#326FC6
Darker −10%#1E4174
Darker −20%#132A4C
Darker −30%#091423
Darker −40%#000000
More saturated +25%#0F54B6
Less saturated −25%#415C84

Channel breakdown

R40
G88
B157
Red40 (15.7%)
Green88 (34.5%)
Blue157 (61.6%)
Hue215.38°
Saturation (HSL)59.39%
Lightness38.63%
Dominant channelBlue
Hex per channelR 28 · G 58 · B 9D

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Every value on this page was computed from “28589d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.