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Colour

#284D87

  • #284D87
  • Blue
  • Dark
  • Nearest: Dark slateblue

#284D87 is a blue with RGB values 40, 77, 135 and HSL 217°, 54%, 34%. It is a dark colour, so white text on it reaches 8.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#284D87#284D87
HEX#284D87
RGBrgb(40, 77, 135)
RGB (0–1)0.1569, 0.302, 0.5294
RGB percentages15.7%, 30.2%, 52.9%
HSLhsl(216.6, 54.3%, 34.3%)
HSV / HSBhsv(216.6, 70.4%, 52.9%)
CMYK70.4%, 43%, 0%, 47.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,641,287
CSS custom property--colour: #284D87;

Brightness & contrast

Relative luminance0.07508WCAG 2.x, 0 is black and 1 is white
Perceived brightness77.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.39:1
Contrast with white8.39:1WCAG normal text: AAA
Contrast with black2.5:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#D7B278

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#325289no red cones; affects about 1% of men; ΔE 3.1 from the original
Deuteranopia#234986no green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#005A63no blue cones; rare, and affects men and women equally; ΔE 36.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.39:1WCAG large text: AAA
Contrast with black, large text2.5:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.7Steel blue · ΔE 23Cornflower blue · ΔE 31.8Midnight blue · ΔE 32.6Slate grey · ΔE 33.9Light slate grey · ΔE 35.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.73, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#876228
Analogous#287C87, #332887
Triadic#87284D, #4D8728
Split complementary#873328, #7C8728
Tetradic#87287C, #876228, #288733

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9AB6E1
Lighter +30%#7399D5
Lighter +20%#4B7DCA
Lighter +10%#3463AE
Darker −10%#1C3760
Darker −20%#112038
Darker −30%#050A11
Darker −40%#000000
More saturated +25%#12489D
Less saturated −25%#3E5271

Channel breakdown

R40
G77
B135
Red40 (15.7%)
Green77 (30.2%)
Blue135 (52.9%)
Hue216.63°
Saturation (HSL)54.29%
Lightness34.31%
Dominant channelBlue
Hex per channelR 28 · G 4D · B 87

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Every value on this page was computed from “284d87” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.