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Recognised as Colour

#040051

  • #040051
  • Blue
  • Dark
  • Nearest: Midnight blue

#040051 is a blue with RGB values 4, 0, 81 and HSL 243°, 100%, 16%. It is a dark colour, so white text on it reaches 18.7:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#040051#040051
HEX#040051
RGBrgb(4, 0, 81)
RGB (0–1)0.0157, 0, 0.3176
RGB percentages1.6%, 0%, 31.8%
HSLhsl(243, 100%, 15.9%)
HSV / HSBhsv(243, 100%, 31.8%)
CMYK95.1%, 100%, 0%, 68.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer262,225
CSS custom property--colour: #040051;

Brightness & contrast

Relative luminance0.0062WCAG 2.x, 0 is black and 1 is white
Perceived brightness27.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 18.68:1
Contrast with white18.68:1WCAG normal text: AAA
Contrast with black1.12:1WCAG normal text: Fail
Greyscale equivalent#070707
Inverted#FBFFAE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#001753no red cones; affects about 1% of men; ΔE 16.6 from the original
Deuteranopia#000E50no green cones; the most common form, about 1% of men; ΔE 10.3 from the original
Tritanopia#001D2Cno blue cones; rare, and affects men and women equally; ΔE 50 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text18.68:1WCAG large text: AAA
Contrast with black, large text1.12:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 11Navy · ΔE 24.7Indigo · ΔE 24.8Dark slateblue · ΔE 26.5Rebecca purple · ΔE 29Dark blue · ΔE 29.9
Nearest named CSS colourMidnight blue (#191970)ΔE 11.01, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4D5100
Analogous#002451, #2D0051
Triadic#510400, #005104
Split complementary#512D00, #245100
Tetradic#510024, #4D5100, #00512D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#291EFF
Lighter +30%#0C00EA
Lighter +20%#0900B7
Lighter +10%#070084
Darker −10%#01001E
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#040051
Less saturated −25%#0D0A47

Channel breakdown

R4
G0
B81
Red4 (1.6%)
Green0 (0%)
Blue81 (31.8%)
Hue242.96°
Saturation (HSL)100%
Lightness15.88%
Dominant channelBlue
Hex per channelR 04 · G 00 · B 51

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Every value on this page was computed from “hex 040051” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.