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Recognised as Colour

#304B83

  • #304B83
  • Blue
  • Dark
  • Nearest: Dark slateblue

#304B83 is a blue with RGB values 48, 75, 131 and HSL 220°, 46%, 35%. It is a dark colour, so white text on it reaches 8.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#304B83#304B83
HEX#304B83
RGBrgb(48, 75, 131)
RGB (0–1)0.1882, 0.2941, 0.5137
RGB percentages18.8%, 29.4%, 51.4%
HSLhsl(220.5, 46.4%, 35.1%)
HSV / HSBhsv(220.5, 63.4%, 51.4%)
CMYK63.4%, 42.7%, 0%, 48.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,165,059
CSS custom property--colour: #304B83;

Brightness & contrast

Relative luminance0.07299WCAG 2.x, 0 is black and 1 is white
Perceived brightness77.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.54:1
Contrast with white8.54:1WCAG normal text: AAA
Contrast with black2.46:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#CFB47C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#325085no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#264982no green cones; the most common form, about 1% of men; ΔE 1.9 from the original
Tritanopia#005860no blue cones; rare, and affects men and women equally; ΔE 36.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.54:1WCAG large text: AAA
Contrast with black, large text2.46:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19.1Steel blue · ΔE 23.8Midnight blue · ΔE 32.2Cornflower blue · ΔE 32.9Slate grey · ΔE 33.3Light slate grey · ΔE 34.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.05, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#836830
Analogous#307483, #3E3083
Triadic#83304B, #4B8330
Split complementary#833E30, #748330
Tetradic#833075, #836830, #30833F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A2B5DD
Lighter +30%#7D98CF
Lighter +20%#577AC2
Lighter +10%#3E60A8
Darker −10%#22365E
Darker −20%#152038
Darker −30%#070B13
Darker −40%#000000
More saturated +25%#1A4399
Less saturated −25%#46536D

Channel breakdown

R48
G75
B131
Red48 (18.8%)
Green75 (29.4%)
Blue131 (51.4%)
Hue220.48°
Saturation (HSL)46.37%
Lightness35.1%
Dominant channelBlue
Hex per channelR 30 · G 4B · B 83

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Every value on this page was computed from “304b83” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.