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Colour

#2800A9

  • #2800A9
  • Blue
  • Dark
  • Nearest: Dark blue

#2800A9 is a blue with RGB values 40, 0, 169 and HSL 254°, 100%, 33%. It is a dark colour, so white text on it reaches 12.6:1 contrast (AAA for normal text). The nearest named colour is Dark blue.

Colour values

#2800A9#2800A9
HEX#2800A9
RGBrgb(40, 0, 169)
RGB (0–1)0.1569, 0, 0.6627
RGB percentages15.7%, 0%, 66.3%
HSLhsl(254.2, 100%, 33.1%)
HSV / HSBhsv(254.2, 100%, 66.3%)
CMYK76.3%, 100%, 0%, 33.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,621,609
CSS custom property--colour: #2800A9;

Brightness & contrast

Relative luminance0.03316WCAG 2.x, 0 is black and 1 is white
Perceived brightness61.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.63:1
Contrast with white12.63:1WCAG normal text: AAA
Contrast with black1.66:1WCAG normal text: Fail
Greyscale equivalent#151515
Inverted#D7FF56

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003AADno red cones; affects about 1% of men; ΔE 30.1 from the original
Deuteranopia#002CA7no green cones; the most common form, about 1% of men; ΔE 22 from the original
Tritanopia#004361no blue cones; rare, and affects men and women equally; ΔE 84.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.63:1WCAG large text: AAA
Contrast with black, large text1.66:1WCAG large text: Fail

Named colours

Dark blue · ΔE 13Medium blue · ΔE 17.8Navy · ΔE 18.2Blue violet · ΔE 23.7Indigo · ΔE 24Dark violet · ΔE 26
Nearest named CSS colourDark blue (#00008B)ΔE 13.04, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#81A900
Analogous#002CA9, #7D00A9
Triadic#A92800, #00A928
Split complementary#A97D00, #2CA900
Tetradic#A9002C, #81A900, #00A97D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9676FF
Lighter +30%#6F43FF
Lighter +20%#4910FF
Lighter +10%#3400DC
Darker −10%#1C0076
Darker −20%#100043
Darker −30%#040010
Darker −40%#000000
More saturated +25%#2800A9
Less saturated −25%#331594

Channel breakdown

R40
G0
B169
Red40 (15.7%)
Green0 (0%)
Blue169 (66.3%)
Hue254.2°
Saturation (HSL)100%
Lightness33.14%
Dominant channelBlue
Hex per channelR 28 · G 00 · B A9

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Every value on this page was computed from “2800a9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.