Recognised as Colour

#AD2A21

#AD2A21
Red
Dark
Nearest: Firebrick

#AD2A21 is a red with RGB values 173, 42, 33 and HSL 4°, 68%, 40%. It is a dark colour, so white text on it reaches 6.7:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#AD2A21#AD2A21

HEX#AD2A21

RGBrgb(173, 42, 33)

RGB (0–1)0.6784, 0.1647, 0.1294

RGB percentages67.8%, 16.5%, 12.9%

HSLhsl(3.9, 68%, 40.4%)

HSV / HSBhsv(3.9, 80.9%, 67.8%)

CMYK0%, 75.7%, 80.9%, 32.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,348,513

CSS custom property--colour: #AD2A21;

Brightness & contrast

Relative luminance0.1065WCAG 2.x, 0 is black and 1 is white

Perceived brightness100.5 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.71:1

Contrast with white6.71:1WCAG normal text: AA

Contrast with black3.13:1WCAG normal text: Fail

Greyscale equivalent#454545

Inverted#52D5DE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#524A1Eno red cones; affects about 1% of men; ΔE 56.5 from the original

Deuteranopia#73661Bno green cones; the most common form, about 1% of men; ΔE 56 from the original

Tritanopia#BF0029no blue cones; rare, and affects men and women equally; ΔE 13.5 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text6.71:1WCAG large text: AAA

Contrast with black, large text3.13:1WCAG large text: AA

Named colours

Firebrick · ΔE 4 Brown · ΔE 7.7 Dark red · ΔE 11.5 Maroon · ΔE 14 Crimson · ΔE 21.1 Indian red · ΔE 22.4

Nearest named CSS colourFirebrick (#B22222)ΔE 4.02, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#21A4AD

Analogous#AD215E, #AD7021

Triadic#21AD2A, #2A21AD

Split complementary#21AD70, #215EAD

Tetradic#5EAD21, #21A4AD, #7021AD

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#EFAFAB

Lighter +30%#E78780

Lighter +20%#DF5E55

Lighter +10%#D6362B

Darker −10%#822019

Darker −20%#571511

Darker −30%#2D0B08

Darker −40%#020000

More saturated +25%#C71407

Less saturated −25%#93403B

Channel breakdown

R173

G42

B33

Red173 (67.8%)

Green42 (16.5%)

Blue33 (12.9%)

Hue3.86°

Saturation (HSL)67.96%

Lightness40.39%

Dominant channelRed

Hex per channelR AD · G 2A · B 21

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#AD2A21

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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