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Recognised as Colour

#042C47

  • #042C47
  • Blue
  • Dark
  • Nearest: Dark slate grey

#042C47 is a blue with RGB values 4, 44, 71 and HSL 204°, 89%, 15%. It is a dark colour, so white text on it reaches 14.4:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#042C47#042C47
HEX#042C47
RGBrgb(4, 44, 71)
RGB (0–1)0.0157, 0.1725, 0.2784
RGB percentages1.6%, 17.3%, 27.8%
HSLhsl(204.2, 89.3%, 14.7%)
HSV / HSBhsv(204.2, 94.4%, 27.8%)
CMYK94.4%, 38%, 0%, 72.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer273,479
CSS custom property--colour: #042C47;

Brightness & contrast

Relative luminance0.02282WCAG 2.x, 0 is black and 1 is white
Perceived brightness41.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 14.42:1
Contrast with white14.42:1WCAG normal text: AAA
Contrast with black1.46:1WCAG normal text: Fail
Greyscale equivalent#252525
Inverted#FBD3B8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1F2D48no red cones; affects about 1% of men; ΔE 5.6 from the original
Deuteranopia#162746no green cones; the most common form, about 1% of men; ΔE 6.5 from the original
Tritanopia#003336no blue cones; rare, and affects men and women equally; ΔE 19 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text14.42:1WCAG large text: AAA
Contrast with black, large text1.46:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 24.3Black · ΔE 26.7Dim grey · ΔE 34.4Slate grey · ΔE 37.3Steel blue · ΔE 37.5Dark slateblue · ΔE 37.8
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 24.27, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#471F04
Analogous#044740, #040B47
Triadic#47042C, #2C4704
Split complementary#47040B, #474104
Tetradic#400447, #471F04, #0B4704

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#24A0F3
Lighter +30%#0C86D8
Lighter +20%#0968A8
Lighter +10%#074A77
Darker −10%#010E17
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#002D4B
Less saturated −25%#0D2A3E

Channel breakdown

R4
G44
B71
Red4 (1.6%)
Green44 (17.3%)
Blue71 (27.8%)
Hue204.18°
Saturation (HSL)89.33%
Lightness14.71%
Dominant channelBlue
Hex per channelR 04 · G 2C · B 47

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Every value on this page was computed from “042c47” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.