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Recognised as Colour

#040019

  • #040019
  • Blue
  • Dark
  • Nearest: Black

#040019 is a blue with RGB values 4, 0, 25 and HSL 250°, 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

#040019#040019
HEX#040019
RGBrgb(4, 0, 25)
RGB (0–1)0.0157, 0, 0.098
RGB percentages1.6%, 0%, 9.8%
HSLhsl(249.6, 100%, 4.9%)
HSV / HSBhsv(249.6, 100%, 9.8%)
CMYK84%, 100%, 0%, 90.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer262,169
CSS custom property--colour: #040019;

Brightness & contrast

Relative luminance0.00096WCAG 2.x, 0 is black and 1 is white
Perceived brightness8.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 20.6:1
Contrast with white20.6:1WCAG normal text: AAA
Contrast with black1.02:1WCAG normal text: Fail
Greyscale equivalent#030303
Inverted#FBFFE6

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00041Ano red cones; affects about 1% of men; ΔE 2.4 from the original
Deuteranopia#000318no green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#00040Ano blue cones; rare, and affects men and women equally; ΔE 10.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.6:1WCAG large text: AAA
Contrast with black, large text1.02:1WCAG large text: Fail

Named colours

Black · ΔE 13Dark slate grey · ΔE 35.8Dim grey · ΔE 45.4Dark slateblue · ΔE 47.3Midnight blue · ΔE 48.4Slate grey · ΔE 52.5
Nearest named CSS colourBlack (#000000)ΔE 13, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#151900
Analogous#000819, #110019
Triadic#190400, #001904
Split complementary#191100, #081900
Tetradic#190008, #151900, #001911

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#2500E5
Lighter +30%#1C00B2
Lighter +20%#14007F
Lighter +10%#0C004C
Darker −10%#000000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#040019
Less saturated −25%#060316

Channel breakdown

R4
G0
B25
Red4 (1.6%)
Green0 (0%)
Blue25 (9.8%)
Hue249.6°
Saturation (HSL)100%
Lightness4.9%
Dominant channelBlue
Hex per channelR 04 · G 00 · B 19

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Every value on this page was computed from “hex 040019” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.