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Recognised as Colour

#0040BF

  • #0040BF
  • Blue
  • Dark
  • Nearest: Slate blue

#0040BF is a blue with RGB values 0, 64, 191 and HSL 220°, 100%, 37%. It is a dark colour, so white text on it reaches 8.4:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#0040BF#0040BF
HEX#0040BF
RGBrgb(0, 64, 191)
RGB (0–1)0, 0.251, 0.749
RGB percentages0%, 25.1%, 74.9%
HSLhsl(219.9, 100%, 37.5%)
HSV / HSBhsv(219.9, 100%, 74.9%)
CMYK100%, 66.5%, 0%, 25.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,575
CSS custom property--colour: #0040BF;

Brightness & contrast

Relative luminance0.07428WCAG 2.x, 0 is black and 1 is white
Perceived brightness81 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.45:1
Contrast with white8.45:1WCAG normal text: AAA
Contrast with black2.49:1WCAG normal text: Fail
Greyscale equivalent#3C3C3C
Inverted#FFBF40

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0056C3no red cones; affects about 1% of men; ΔE 16.3 from the original
Deuteranopia#0045BDno green cones; the most common form, about 1% of men; ΔE 5.1 from the original
Tritanopia#00637Ano blue cones; rare, and affects men and women equally; ΔE 72 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.45:1WCAG large text: AAA
Contrast with black, large text2.49:1WCAG large text: Fail

Named colours

Slate blue · ΔE 17.8Royal blue · ΔE 18.3Medium slateblue · ΔE 20.9Dark blue · ΔE 23.6Navy · ΔE 24Rebecca purple · ΔE 24.4
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 17.81, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BF7F00
Analogous#009FBF, #2000BF
Triadic#BF0040, #40BF00
Split complementary#BF2000, #9FBF00
Tetradic#BF009F, #BF7F00, #00BF20

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8CB3FF
Lighter +30%#5991FF
Lighter +20%#266FFF
Lighter +10%#0051F2
Darker −10%#002F8C
Darker −20%#001E59
Darker −30%#000D26
Darker −40%#000000
More saturated +25%#0040BF
Less saturated −25%#1848A7

Channel breakdown

R0
G64
B191
Red0 (0%)
Green64 (25.1%)
Blue191 (74.9%)
Hue219.9°
Saturation (HSL)100%
Lightness37.45%
Dominant channelBlue
Hex per channelR 00 · G 40 · B BF

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Every value on this page was computed from “0040bf” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.