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Recognised as Colour

#278AD2

  • #278AD2
  • Blue
  • Dark
  • Nearest: Steel blue

#278AD2 is a blue with RGB values 39, 138, 210 and HSL 205°, 69%, 49%. It is a dark colour, so black text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#278AD2#278AD2
HEX#278AD2
RGBrgb(39, 138, 210)
RGB (0–1)0.1529, 0.5412, 0.8235
RGB percentages15.3%, 54.1%, 82.4%
HSLhsl(205.3, 68.7%, 48.8%)
HSV / HSBhsv(205.3, 81.4%, 82.4%)
CMYK81.4%, 34.3%, 0%, 17.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,591,442
CSS custom property--colour: #278AD2;

Brightness & contrast

Relative luminance0.23261WCAG 2.x, 0 is black and 1 is white
Perceived brightness129.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.65:1
Contrast with white3.72:1WCAG normal text: Fail
Contrast with black5.65:1WCAG normal text: AA
Greyscale equivalent#7A7A7A
Inverted#D8752D

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#688DD5no red cones; affects about 1% of men; ΔE 11.2 from the original
Deuteranopia#507ED1no green cones; the most common form, about 1% of men; ΔE 13.1 from the original
Tritanopia#009BA4no blue cones; rare, and affects men and women equally; ΔE 41.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.72:1WCAG large text: AA
Contrast with black, large text5.65:1WCAG large text: AAA

Named colours

Steel blue · ΔE 13Cornflower blue · ΔE 14.3Dodgerblue · ΔE 22.8Deep skyblue · ΔE 23Light skyblue · ΔE 30.5Light slate grey · ΔE 33.7
Nearest named CSS colourSteel blue (#4682B4)ΔE 13.03, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D26F27
Analogous#27D2C5, #2734D2
Triadic#D2278A, #8AD227
Split complementary#D22734, #D2C527
Tetradic#C527D2, #D26F27, #34D227

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CFE6F6
Lighter +30%#A4CFEE
Lighter +20%#79B8E6
Lighter +10%#4EA1DE
Darker −10%#1F6EA7
Darker −20%#17517C
Darker −30%#0F3551
Darker −40%#071926
More saturated +25%#088FF1
Less saturated −25%#4685B3

Channel breakdown

R39
G138
B210
Red39 (15.3%)
Green138 (54.1%)
Blue210 (82.4%)
Hue205.26°
Saturation (HSL)68.67%
Lightness48.82%
Dominant channelBlue
Hex per channelR 27 · G 8A · B D2

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Every value on this page was computed from “278ad2” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.