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Colour

#0042A9

  • #0042A9
  • Blue
  • Dark
  • Nearest: Royal blue

#0042A9 is a blue with RGB values 0, 66, 169 and HSL 217°, 100%, 33%. It is a dark colour, so white text on it reaches 8.9:1 contrast (AAA for normal text). The nearest named colour is Royal blue.

Colour values

#0042A9#0042A9
HEX#0042A9
RGBrgb(0, 66, 169)
RGB (0–1)0, 0.2588, 0.6627
RGB percentages0%, 25.9%, 66.3%
HSLhsl(216.6, 100%, 33.1%)
HSV / HSBhsv(216.6, 100%, 66.3%)
CMYK100%, 60.9%, 0%, 33.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer17,065
CSS custom property--colour: #0042A9;

Brightness & contrast

Relative luminance0.06761WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.93:1
Contrast with white8.93:1WCAG normal text: AAA
Contrast with black2.35:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#FFBD56

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0051ACno red cones; affects about 1% of men; ΔE 11.4 from the original
Deuteranopia#0043A7no green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#005D6Fno blue cones; rare, and affects men and women equally; ΔE 59.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.93:1WCAG large text: AAA
Contrast with black, large text2.35:1WCAG large text: Fail

Named colours

Royal blue · ΔE 17.5Dark slateblue · ΔE 17.7Slate blue · ΔE 17.9Midnight blue · ΔE 19.6Rebecca purple · ΔE 21.9Medium slateblue · ΔE 26.9
Nearest named CSS colourRoyal blue (#4169E1)ΔE 17.5, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A96700
Analogous#0096A9, #1300A9
Triadic#A90042, #42A900
Split complementary#A91300, #96A900
Tetradic#A90096, #A96700, #00A913

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#76ACFF
Lighter +30%#438CFF
Lighter +20%#106DFF
Lighter +10%#0056DC
Darker −10%#002E76
Darker −20%#001A43
Darker −30%#000610
Darker −40%#000000
More saturated +25%#0042A9
Less saturated −25%#154794

Channel breakdown

R0
G66
B169
Red0 (0%)
Green66 (25.9%)
Blue169 (66.3%)
Hue216.57°
Saturation (HSL)100%
Lightness33.14%
Dominant channelBlue
Hex per channelR 00 · G 42 · B A9

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Every value on this page was computed from “0042a9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.