Colour

#AC0021

#AC0021
Red
Dark
Nearest: Firebrick

#AC0021 is a red with RGB values 172, 0, 33 and HSL 348°, 100%, 34%. It is a dark colour, so white text on it reaches 7.6:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#AC0021#AC0021

HEX#AC0021

RGBrgb(172, 0, 33)

RGB (0–1)0.6745, 0, 0.1294

RGB percentages67.5%, 0%, 12.9%

HSLhsl(348.5, 100%, 33.7%)

HSV / HSBhsv(348.5, 100%, 67.5%)

CMYK0%, 100%, 80.8%, 32.5%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,272,225

CSS custom property--colour: #AC0021;

Brightness & contrast

Relative luminance0.0888WCAG 2.x, 0 is black and 1 is white

Perceived brightness94.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7.56:1

Contrast with white7.56:1WCAG normal text: AAA

Contrast with black2.78:1WCAG normal text: Fail

Greyscale equivalent#272727

Inverted#53FFDE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#453E20no red cones; affects about 1% of men; ΔE 64.6 from the original

Deuteranopia#6B6019no green cones; the most common form, about 1% of men; ΔE 64.9 from the original

Tritanopia#BE0013no 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 text7.56:1WCAG large text: AAA

Contrast with black, large text2.78:1WCAG large text: Fail

Named colours

Firebrick · ΔE 6.3 Brown · ΔE 11.3 Dark red · ΔE 13.8 Crimson · ΔE 15.6 Maroon · ΔE 16.3 Indian red · ΔE 26.4

Nearest named CSS colourFirebrick (#B22222)ΔE 6.34, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00AC8B

Analogous#AC0077, #AC3500

Triadic#21AC00, #0021AC

Split complementary#00AC35, #0077AC

Tetradic#77AC00, #00AC8B, #3500AC

Tints, shades & saturation

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

Lighter +40%#FF7993

Lighter +30%#FF4669

Lighter +20%#FF1340

Lighter +10%#DF002B

Darker −10%#790017

Darker −20%#46000D

Darker −30%#130004

Darker −40%#000000

More saturated +25%#AC0021

Less saturated −25%#97162E

Channel breakdown

R172

B33

Red172 (67.5%)

Green0 (0%)

Blue33 (12.9%)

Hue348.49°

Saturation (HSL)100%

Lightness33.73%

Dominant channelRed

Hex per channelR AC · G 00 · B 21

Keep nerding

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

#AC0021

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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