Nerdulator> put something in

Recognised as Colour

#18378B

  • #18378B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#18378B is a blue with RGB values 24, 55, 139 and HSL 224°, 71%, 32%. It is a dark colour, so white text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#18378B#18378B
HEX#18378B
RGBrgb(24, 55, 139)
RGB (0–1)0.0941, 0.2157, 0.5451
RGB percentages9.4%, 21.6%, 54.5%
HSLhsl(223.8, 70.6%, 32%)
HSV / HSBhsv(223.8, 82.7%, 54.5%)
CMYK82.7%, 60.4%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,587,083
CSS custom property--colour: #18378B;

Brightness & contrast

Relative luminance0.04791WCAG 2.x, 0 is black and 1 is white
Perceived brightness64.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.72:1
Contrast with white10.72:1WCAG normal text: AAA
Contrast with black1.96:1WCAG normal text: Fail
Greyscale equivalent#363636
Inverted#E7C874

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00438Eno red cones; affects about 1% of men; ΔE 9.9 from the original
Deuteranopia#003989no green cones; the most common form, about 1% of men; ΔE 4 from the original
Tritanopia#004C5Bno blue cones; rare, and affects men and women equally; ΔE 50.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.72:1WCAG large text: AAA
Contrast with black, large text1.96:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 10Midnight blue · ΔE 14.2Rebecca purple · ΔE 22.3Slate blue · ΔE 25.2Royal blue · ΔE 27Indigo · ΔE 30.6
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B6C18
Analogous#18708B, #33188B
Triadic#8B1837, #378B18
Split complementary#8B3318, #708B18
Tetradic#8B1870, #8B6C18, #188B33

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#85A0EA
Lighter +30%#5A7EE2
Lighter +20%#2E5DDB
Lighter +10%#2048B6
Darker −10%#102660
Darker −20%#091534
Darker −30%#010309
Darker −40%#000000
More saturated +25%#042E9F
Less saturated −25%#2C4077

Channel breakdown

R24
G55
B139
Red24 (9.4%)
Green55 (21.6%)
Blue139 (54.5%)
Hue223.83°
Saturation (HSL)70.55%
Lightness31.96%
Dominant channelBlue
Hex per channelR 18 · G 37 · B 8B

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

Nerdulate something else

Nothing in mind? Surprise me · today’s page

Every value on this page was computed from “18378b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.