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Colour

#00378D

  • #00378D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#00378D is a blue with RGB values 0, 55, 141 and HSL 217°, 100%, 28%. It is a dark colour, so white text on it reaches 10.9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#00378D#00378D
HEX#00378D
RGBrgb(0, 55, 141)
RGB (0–1)0, 0.2157, 0.5529
RGB percentages0%, 21.6%, 55.3%
HSLhsl(216.6, 100%, 27.6%)
HSV / HSBhsv(216.6, 100%, 55.3%)
CMYK100%, 61%, 0%, 44.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer14,221
CSS custom property--colour: #00378D;

Brightness & contrast

Relative luminance0.04655WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.87:1
Contrast with white10.87:1WCAG normal text: AAA
Contrast with black1.93:1WCAG normal text: Fail
Greyscale equivalent#323232
Inverted#FFC872

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004390no red cones; affects about 1% of men; ΔE 9.2 from the original
Deuteranopia#00378Bno green cones; the most common form, about 1% of men; ΔE 1.3 from the original
Tritanopia#004D5Cno blue cones; rare, and affects men and women equally; ΔE 51.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.87:1WCAG large text: AAA
Contrast with black, large text1.93:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12Midnight blue · ΔE 14.6Rebecca purple · ΔE 23.4Slate blue · ΔE 25.4Royal blue · ΔE 26.4Indigo · ΔE 31.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.01, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8D5600
Analogous#007D8D, #10008D
Triadic#8D0037, #378D00
Split complementary#8D1000, #7D8D00
Tetradic#8D007D, #8D5600, #008D10

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#5A9AFF
Lighter +30%#277BFF
Lighter +20%#005FF3
Lighter +10%#004BC0
Darker −10%#00235A
Darker −20%#000F27
Darker −30%#000000
Darker −40%#000000
More saturated +25%#00378D
Less saturated −25%#123B7B

Channel breakdown

R0
G55
B141
Red0 (0%)
Green55 (21.6%)
Blue141 (55.3%)
Hue216.6°
Saturation (HSL)100%
Lightness27.65%
Dominant channelBlue
Hex per channelR 00 · G 37 · B 8D

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Every value on this page was computed from “00378d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.