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Colour

#00288F

  • #00288F
  • Blue
  • Dark
  • Nearest: Midnight blue

#00288F is a blue with RGB values 0, 40, 143 and HSL 223°, 100%, 28%. It is a dark colour, so white text on it reaches 12.4:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#00288F#00288F
HEX#00288F
RGBrgb(0, 40, 143)
RGB (0–1)0, 0.1569, 0.5608
RGB percentages0%, 15.7%, 56.1%
HSLhsl(223.2, 100%, 28%)
HSV / HSBhsv(223.2, 100%, 56.1%)
CMYK100%, 72%, 0%, 43.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer10,383
CSS custom property--colour: #00288F;

Brightness & contrast

Relative luminance0.03501WCAG 2.x, 0 is black and 1 is white
Perceived brightness57.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.35:1
Contrast with white12.35:1WCAG normal text: AAA
Contrast with black1.7:1WCAG normal text: Fail
Greyscale equivalent#272727
Inverted#FFD770

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003B92no red cones; affects about 1% of men; ΔE 14.8 from the original
Deuteranopia#002E8Dno green cones; the most common form, about 1% of men; ΔE 6.1 from the original
Tritanopia#004558no blue cones; rare, and affects men and women equally; ΔE 61.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.35:1WCAG large text: AAA
Contrast with black, large text1.7:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 11.4Navy · ΔE 18.5Rebecca purple · ΔE 19.4Indigo · ΔE 20.3Dark slateblue · ΔE 20.3Dark blue · ΔE 21.6
Nearest named CSS colourMidnight blue (#191970)ΔE 11.42, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8F6700
Analogous#006F8F, #20008F
Triadic#8F0028, #288F00
Split complementary#8F2000, #6F8F00
Tetradic#8F006F, #8F6700, #008F20

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#5C8AFF
Lighter +30%#2965FF
Lighter +20%#0045F5
Lighter +10%#0036C2
Darker −10%#001A5C
Darker −20%#000B29
Darker −30%#000000
Darker −40%#000000
More saturated +25%#00288F
Less saturated −25%#12307D

Channel breakdown

R0
G40
B143
Red0 (0%)
Green40 (15.7%)
Blue143 (56.1%)
Hue223.22°
Saturation (HSL)100%
Lightness28.04%
Dominant channelBlue
Hex per channelR 00 · G 28 · B 8F

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Every value on this page was computed from “00288f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.