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Recognised as Colour

#AD2A33

  • #AD2A33
  • Red
  • Dark
  • Nearest: Brown

#AD2A33 is a red with RGB values 173, 42, 51 and HSL 356°, 61%, 42%. It is a dark colour, so white text on it reaches 6.7:1 contrast (AA for normal text). The nearest named colour is Brown.

Colour values

#AD2A33#AD2A33
HEX#AD2A33
RGBrgb(173, 42, 51)
RGB (0–1)0.6784, 0.1647, 0.2
RGB percentages67.8%, 16.5%, 20%
HSLhsl(355.9, 60.9%, 42.2%)
HSV / HSBhsv(355.9, 75.7%, 67.8%)
CMYK0%, 75.7%, 70.5%, 32.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer11,348,531
CSS custom property--colour: #AD2A33;

Brightness & contrast

Relative luminance0.10779WCAG 2.x, 0 is black and 1 is white
Perceived brightness101.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.65:1
Contrast with white6.65:1WCAG normal text: AA
Contrast with black3.16:1WCAG normal text: Fail
Greyscale equivalent#474747
Inverted#52D5CC

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#504A32no red cones; affects about 1% of men; ΔE 56.2 from the original
Deuteranopia#71662Fno green cones; the most common form, about 1% of men; ΔE 56.3 from the original
Tritanopia#BE002Fno blue cones; rare, and affects men and women equally; ΔE 13.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.65:1WCAG large text: AAA
Contrast with black, large text3.16:1WCAG large text: AA

Named colours

Brown · ΔE 4.6Firebrick · ΔE 10.7Indian red · ΔE 17Dark red · ΔE 17.8Maroon · ΔE 17.9Crimson · ΔE 20.8
Nearest named CSS colourBrown (#A52A2A)ΔE 4.58, a close match
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#2AADA4
Analogous#AD2A74, #AD632A
Triadic#33AD2A, #2A33AD
Split complementary#2AAD62, #2A75AD
Tetradic#74AD2A, #2AADA4, #632AAD

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EDB6BA
Lighter +30%#E38D93
Lighter +20%#D9646C
Lighter +10%#CF3B45
Darker −10%#842027
Darker −20%#5B161B
Darker −30%#320C0F
Darker −40%#090203
More saturated +25%#C80F1C
Less saturated −25%#92454A

Channel breakdown

R173
G42
B51
Red173 (67.8%)
Green42 (16.5%)
Blue51 (20%)
Hue355.88°
Saturation (HSL)60.93%
Lightness42.16%
Dominant channelRed
Hex per channelR AD · G 2A · B 33

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Every value on this page was computed from “ad2a33” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.