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Recognised as Colour

#3F309D

  • #3F309D
  • Blue
  • Dark
  • Nearest: Rebecca purple

#3F309D is a blue with RGB values 63, 48, 157 and HSL 248°, 53%, 40%. It is a dark colour, so white text on it reaches 9.9:1 contrast (AAA for normal text). The nearest named colour is Rebecca purple.

Colour values

#3F309D#3F309D
HEX#3F309D
RGBrgb(63, 48, 157)
RGB (0–1)0.2471, 0.1882, 0.6157
RGB percentages24.7%, 18.8%, 61.6%
HSLhsl(248.3, 53.2%, 40.2%)
HSV / HSBhsv(248.3, 69.4%, 61.6%)
CMYK59.9%, 69.4%, 0%, 38.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,141,213
CSS custom property--colour: #3F309D;

Brightness & contrast

Relative luminance0.05605WCAG 2.x, 0 is black and 1 is white
Perceived brightness73.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.9:1
Contrast with white9.9:1WCAG normal text: AAA
Contrast with black2.12:1WCAG normal text: Fail
Greyscale equivalent#3B3B3B
Inverted#C0CF62

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0047A0no red cones; affects about 1% of men; ΔE 20.9 from the original
Deuteranopia#003F9Bno green cones; the most common form, about 1% of men; ΔE 17 from the original
Tritanopia#004D62no blue cones; rare, and affects men and women equally; ΔE 63.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.9:1WCAG large text: AAA
Contrast with black, large text2.12:1WCAG large text: Fail

Named colours

Rebecca purple · ΔE 11.9Midnight blue · ΔE 16Indigo · ΔE 16.1Slate blue · ΔE 17.1Dark slateblue · ΔE 19.4Navy · ΔE 19.6
Nearest named CSS colourRebecca purple (#663399)ΔE 11.91, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8E9D30
Analogous#30579D, #76309D
Triadic#9D3F30, #309D3F
Split complementary#9D7630, #579D30
Tetradic#9D3057, #8E9D30, #309D76

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B9B2E7
Lighter +30%#968BDB
Lighter +20%#7264CF
Lighter +10%#4F3CC4
Darker −10%#2F2476
Darker −20%#20184F
Darker −30%#100C28
Darker −40%#000001
More saturated +25%#2C16B7
Less saturated −25%#524A83

Channel breakdown

R63
G48
B157
Red63 (24.7%)
Green48 (18.8%)
Blue157 (61.6%)
Hue248.26°
Saturation (HSL)53.17%
Lightness40.2%
Dominant channelBlue
Hex per channelR 3F · G 30 · B 9D

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Every value on this page was computed from “3f309d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.