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Colour

#04001B

  • #04001B
  • Blue
  • Dark
  • Nearest: Black

#04001B is a blue with RGB values 4, 0, 27 and HSL 249°, 100%, 5%. It is a dark colour, so white text on it reaches 20.6:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#04001B#04001B
HEX#04001B
RGBrgb(4, 0, 27)
RGB (0–1)0.0157, 0, 0.1059
RGB percentages1.6%, 0%, 10.6%
HSLhsl(248.9, 100%, 5.3%)
HSV / HSBhsv(248.9, 100%, 10.6%)
CMYK85.2%, 100%, 0%, 89.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer262,171
CSS custom property--colour: #04001B;

Brightness & contrast

Relative luminance0.00105WCAG 2.x, 0 is black and 1 is white
Perceived brightness9.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 20.57:1
Contrast with white20.57:1WCAG normal text: AAA
Contrast with black1.02:1WCAG normal text: Fail
Greyscale equivalent#030303
Inverted#FBFFE4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00041Cno red cones; affects about 1% of men; ΔE 2.4 from the original
Deuteranopia#00031Ano green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#00050Bno blue cones; rare, and affects men and women equally; ΔE 12.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.57:1WCAG large text: AAA
Contrast with black, large text1.02:1WCAG large text: Fail

Named colours

Black · ΔE 14.6Dark slate grey · ΔE 36.4Dim grey · ΔE 45.8Dark slateblue · ΔE 46.1Midnight blue · ΔE 46.9Slate grey · ΔE 52.6
Nearest named CSS colourBlack (#000000)ΔE 14.62, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#171B00
Analogous#00091B, #12001B
Triadic#1B0400, #001B04
Split complementary#1B1200, #091B00
Tetradic#1B0009, #171B00, #001B12

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#2200E7
Lighter +30%#1B00B4
Lighter +20%#130081
Lighter +10%#0C004E
Darker −10%#000000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#04001B
Less saturated −25%#060318

Channel breakdown

R4
G0
B27
Red4 (1.6%)
Green0 (0%)
Blue27 (10.6%)
Hue248.89°
Saturation (HSL)100%
Lightness5.29%
Dominant channelBlue
Hex per channelR 04 · G 00 · B 1B

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Every value on this page was computed from “04001b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.