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Recognised as Colour

#04398B

  • #04398B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#04398B is a blue with RGB values 4, 57, 139 and HSL 216°, 94%, 28%. 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

#04398B#04398B
HEX#04398B
RGBrgb(4, 57, 139)
RGB (0–1)0.0157, 0.2235, 0.5451
RGB percentages1.6%, 22.4%, 54.5%
HSLhsl(216.4, 94.4%, 28%)
HSV / HSBhsv(216.4, 97.1%, 54.5%)
CMYK97.1%, 59%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer276,875
CSS custom property--colour: #04398B;

Brightness & contrast

Relative luminance0.04816WCAG 2.x, 0 is black and 1 is white
Perceived brightness64.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.7:1
Contrast with white10.7:1WCAG normal text: AAA
Contrast with black1.96:1WCAG normal text: Fail
Greyscale equivalent#343434
Inverted#FBC674

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00448Eno red cones; affects about 1% of men; ΔE 8.4 from the original
Deuteranopia#003889no green cones; the most common form, about 1% of men; ΔE 0.7 from the original
Tritanopia#004E5Cno blue cones; rare, and affects men and women equally; ΔE 49.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.7:1WCAG large text: AAA
Contrast with black, large text1.96:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.4Midnight blue · ΔE 16.3Rebecca purple · ΔE 24.9Slate blue · ΔE 26.8Royal blue · ΔE 27.6Indigo · ΔE 33.3
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.36, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B5604
Analogous#047C8B, #13048B
Triadic#8B0439, #398B04
Split complementary#8B1304, #7C8B04
Tetradic#8B047C, #8B5604, #048B13

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#619DFA
Lighter +30%#2F7EF9
Lighter +20%#0762EE
Lighter +10%#054DBD
Darker −10%#032559
Darker −20%#011028
Darker −30%#000000
Darker −40%#000000
More saturated +25%#00388F
Less saturated −25%#163D79

Channel breakdown

R4
G57
B139
Red4 (1.6%)
Green57 (22.4%)
Blue139 (54.5%)
Hue216.44°
Saturation (HSL)94.41%
Lightness28.04%
Dominant channelBlue
Hex per channelR 04 · G 39 · B 8B

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Every value on this page was computed from “04398b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.