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Recognised as Colour

#042F66

  • #042F66
  • Blue
  • Dark
  • Nearest: Dark slateblue

#042F66 is a blue with RGB values 4, 47, 102 and HSL 214°, 92%, 21%. It is a dark colour, so white text on it reaches 13.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#042F66#042F66
HEX#042F66
RGBrgb(4, 47, 102)
RGB (0–1)0.0157, 0.1843, 0.4
RGB percentages1.6%, 18.4%, 40%
HSLhsl(213.7, 92.5%, 20.8%)
HSV / HSBhsv(213.7, 96.1%, 40%)
CMYK96.1%, 53.9%, 0%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer274,278
CSS custom property--colour: #042F66;

Brightness & contrast

Relative luminance0.03018WCAG 2.x, 0 is black and 1 is white
Perceived brightness49.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.1:1
Contrast with white13.1:1WCAG normal text: AAA
Contrast with black1.6:1WCAG normal text: Fail
Greyscale equivalent#2A2A2A
Inverted#FBD099

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0A3568no red cones; affects about 1% of men; ΔE 4.4 from the original
Deuteranopia#002D65no green cones; the most common form, about 1% of men; ΔE 1.3 from the original
Tritanopia#003D45no blue cones; rare, and affects men and women equally; ΔE 35.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text13.1:1WCAG large text: AAA
Contrast with black, large text1.6:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 20.1Midnight blue · ΔE 25.8Steel blue · ΔE 35.5Rebecca purple · ΔE 36.9Dark slate grey · ΔE 40.6Slate blue · ΔE 42.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 20.11, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#663B04
Analogous#046066, #0A0466
Triadic#66042F, #2F6604
Split complementary#660A04, #606604
Tetradic#660460, #663B04, #04660A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#3F90F7
Lighter +30%#0D73F6
Lighter +20%#085CC8
Lighter +10%#064697
Darker −10%#021835
Darker −20%#000204
Darker −30%#000000
Darker −40%#000000
More saturated +25%#002F6A
Less saturated −25%#113159

Channel breakdown

R4
G47
B102
Red4 (1.6%)
Green47 (18.4%)
Blue102 (40%)
Hue213.67°
Saturation (HSL)92.45%
Lightness20.78%
Dominant channelBlue
Hex per channelR 04 · G 2F · B 66

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Every value on this page was computed from “042f66” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.