Colour

#A4000B

#A4000B
Red
Dark
Nearest: Firebrick

#A4000B is a red with RGB values 164, 0, 11 and HSL 356°, 100%, 32%. It is a dark colour, so white text on it reaches 8.1:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#A4000B#A4000B

HEX#A4000B

RGBrgb(164, 0, 11)

RGB (0–1)0.6431, 0, 0.0431

RGB percentages64.3%, 0%, 4.3%

HSLhsl(356, 100%, 32.2%)

HSV / HSBhsv(356, 100%, 64.3%)

CMYK0%, 100%, 93.3%, 35.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer10,747,915

CSS custom property--colour: #A4000B;

Brightness & contrast

Relative luminance0.07917WCAG 2.x, 0 is black and 1 is white

Perceived brightness89.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 8.13:1

Contrast with white8.13:1WCAG normal text: AAA

Contrast with black2.58:1WCAG normal text: Fail

Greyscale equivalent#242424

Inverted#5BFFF4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#433A07no red cones; affects about 1% of men; ΔE 62.1 from the original

Deuteranopia#675B00no green cones; the most common form, about 1% of men; ΔE 62.1 from the original

Tritanopia#B60009no blue cones; rare, and affects men and women equally; ΔE 8 from the original

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

Contrast with white, large text8.13:1WCAG large text: AAA

Contrast with black, large text2.58:1WCAG large text: Fail

Named colours

Firebrick · ΔE 8.1 Dark red · ΔE 9.1 Maroon · ΔE 13.8 Brown · ΔE 15.7 Crimson · ΔE 21.2 Tomato · ΔE 28.5

Nearest named CSS colourFirebrick (#B22222)ΔE 8.1, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00A499

Analogous#A4005D, #A44700

Triadic#0BA400, #000BA4

Split complementary#00A447, #005DA4

Tetradic#5DA400, #00A499, #4700A4

Tints, shades & saturation

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

Lighter +40%#FF717B

Lighter +30%#FF3E4B

Lighter +20%#FF0B1B

Lighter +10%#D7000E

Darker −10%#710008

Darker −20%#3E0004

Darker −30%#0B0001

Darker −40%#000000

More saturated +25%#A4000B

Less saturated −25%#90141D

Channel breakdown

R164

B11

Red164 (64.3%)

Green0 (0%)

Blue11 (4.3%)

Hue355.98°

Saturation (HSL)100%

Lightness32.16%

Dominant channelRed

Hex per channelR A4 · G 00 · B 0B

Keep nerding

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#A4000B

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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