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Recognised as Colour

#643B74

  • #643B74
  • Violet
  • Dark
  • Nearest: Dark slateblue

#643B74 is a violet with RGB values 100, 59, 116 and HSL 283°, 33%, 34%. It is a dark colour, so white text on it reaches 8.7:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#643B74#643B74
HEX#643B74
RGBrgb(100, 59, 116)
RGB (0–1)0.3922, 0.2314, 0.4549
RGB percentages39.2%, 23.1%, 45.5%
HSLhsl(283.2, 32.6%, 34.3%)
HSV / HSBhsv(283.2, 49.1%, 45.5%)
CMYK13.8%, 49.1%, 0%, 54.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,568,820
CSS custom property--colour: #643B74;

Brightness & contrast

Relative luminance0.07098WCAG 2.x, 0 is black and 1 is white
Perceived brightness81 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.68:1
Contrast with white8.68:1WCAG normal text: AAA
Contrast with black2.42:1WCAG normal text: Fail
Greyscale equivalent#484848
Inverted#9BC48B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#304976no red cones; affects about 1% of men; ΔE 23.8 from the original
Deuteranopia#3C4D72no green cones; the most common form, about 1% of men; ΔE 24.6 from the original
Tritanopia#634352no blue cones; rare, and affects men and women equally; ΔE 25.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.68:1WCAG large text: AAA
Contrast with black, large text2.42:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 16.7Rebecca purple · ΔE 25.7Midnight blue · ΔE 29Purple · ΔE 32.1Medium purple · ΔE 34.5Slate blue · ΔE 35.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.7, a distinctly different colour
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4B743B
Analogous#483B74, #743B68
Triadic#74643B, #3B7464
Split complementary#68743B, #3B7447
Tetradic#74473B, #4B743B, #3B6874

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C7A8D3
Lighter +30%#B186C2
Lighter +20%#9B65B0
Lighter +10%#814C96
Darker −10%#472A52
Darker −20%#2A1930
Darker −30%#0D070F
Darker −40%#000000
More saturated +25%#6E258A
Less saturated −25%#5A515E

Channel breakdown

R100
G59
B116
Red100 (39.2%)
Green59 (23.1%)
Blue116 (45.5%)
Hue283.16°
Saturation (HSL)32.57%
Lightness34.31%
Dominant channelBlue
Hex per channelR 64 · G 3B · B 74

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Every value on this page was computed from “643b74” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.