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Recognised as Colour

#643A40

  • #643A40
  • Red
  • Dark
  • Nearest: Dim grey

#643A40 is a red with RGB values 100, 58, 64 and HSL 351°, 27%, 31%. It is a dark colour, so white text on it reaches 9.5:1 contrast (AAA for normal text). The nearest named colour is Dim grey.

Colour values

#643A40#643A40
HEX#643A40
RGBrgb(100, 58, 64)
RGB (0–1)0.3922, 0.2275, 0.251
RGB percentages39.2%, 22.7%, 25.1%
HSLhsl(351.4, 26.6%, 31%)
HSV / HSBhsv(351.4, 42%, 39.2%)
CMYK0%, 42%, 36%, 60.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,568,512
CSS custom property--colour: #643A40;

Brightness & contrast

Relative luminance0.06106WCAG 2.x, 0 is black and 1 is white
Perceived brightness73.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.45:1
Contrast with white9.45:1WCAG normal text: AAA
Contrast with black2.22:1WCAG normal text: Fail
Greyscale equivalent#434343
Inverted#9BC5BF

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#414140no red cones; affects about 1% of men; ΔE 20.1 from the original
Deuteranopia#4C493Fno green cones; the most common form, about 1% of men; ΔE 20.3 from the original
Tritanopia#6B363Cno blue cones; rare, and affects men and women equally; ΔE 5.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.45:1WCAG large text: AAA
Contrast with black, large text2.22:1WCAG large text: Fail

Named colours

Dim grey · ΔE 24.7Gray · ΔE 31.1Dark slate grey · ΔE 32.2Rosy brown · ΔE 34.1Slate grey · ΔE 34.9Black · ΔE 35.7
Nearest named CSS colourDim grey (#696969)ΔE 24.74, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3A645E
Analogous#643A55, #64493A
Triadic#40643A, #3A4064
Split complementary#3A6449, #3A5564
Tetradic#55643A, #3A645E, #493A64

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9A1A7
Lighter +30%#B68189
Lighter +20%#A3616A
Lighter +10%#844D55
Darker −10%#44272B
Darker −20%#231517
Darker −30%#030202
Darker −40%#000000
More saturated +25%#782632
Less saturated −25%#504E4E

Channel breakdown

R100
G58
B64
Red100 (39.2%)
Green58 (22.7%)
Blue64 (25.1%)
Hue351.43°
Saturation (HSL)26.58%
Lightness30.98%
Dominant channelRed
Hex per channelR 64 · G 3A · B 40

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Every value on this page was computed from “643a40” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.