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Recognised as Colour

#305BB4

  • #305BB4
  • Blue
  • Dark
  • Nearest: Dark slateblue

#305BB4 is a blue with RGB values 48, 91, 180 and HSL 220°, 58%, 45%. It is a dark colour, so white text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Dark slateblue.

Colour values

#305BB4#305BB4
HEX#305BB4
RGBrgb(48, 91, 180)
RGB (0–1)0.1882, 0.3569, 0.7059
RGB percentages18.8%, 35.7%, 70.6%
HSLhsl(220.5, 57.9%, 44.7%)
HSV / HSBhsv(220.5, 73.3%, 70.6%)
CMYK73.3%, 49.4%, 0%, 29.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,169,204
CSS custom property--colour: #305BB4;

Brightness & contrast

Relative luminance0.11406WCAG 2.x, 0 is black and 1 is white
Perceived brightness96.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.4:1
Contrast with white6.4:1WCAG normal text: AA
Contrast with black3.28:1WCAG normal text: Fail
Greyscale equivalent#585858
Inverted#CFA44B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2865B7no red cones; affects about 1% of men; ΔE 7.4 from the original
Deuteranopia#0059B2no green cones; the most common form, about 1% of men; ΔE 4 from the original
Tritanopia#00707Fno blue cones; rare, and affects men and women equally; ΔE 51.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.4:1WCAG large text: AAA
Contrast with black, large text3.28:1WCAG large text: AA

Named colours

Dark slateblue · ΔE 16.5Royal blue · ΔE 18.4Slate blue · ΔE 21.2Cornflower blue · ΔE 22.9Dodgerblue · ΔE 23.4Medium purple · ΔE 25.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.51, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B48930
Analogous#309DB4, #4730B4
Triadic#B4305B, #5BB430
Split complementary#B44730, #9DB430
Tetradic#B4309D, #B48930, #30B447

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C1D0EF
Lighter +30%#99B1E4
Lighter +20%#7193D9
Lighter +10%#4974CE
Darker −10%#25478C
Darker −20%#1B3263
Darker −30%#101E3B
Darker −40%#050A13
More saturated +25%#1451D1
Less saturated −25%#4D6598

Channel breakdown

R48
G91
B180
Red48 (18.8%)
Green91 (35.7%)
Blue180 (70.6%)
Hue220.45°
Saturation (HSL)57.89%
Lightness44.71%
Dominant channelBlue
Hex per channelR 30 · G 5B · B B4

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Every value on this page was computed from “305bb4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.