Colour

#A1001D

#A1001D
Red
Dark
Nearest: Firebrick

#A1001D is a red with RGB values 161, 0, 29 and HSL 349°, 100%, 32%. It is a dark colour, so white text on it reaches 8.3:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#A1001D#A1001D

HEX#A1001D

RGBrgb(161, 0, 29)

RGB (0–1)0.6314, 0, 0.1137

RGB percentages63.1%, 0%, 11.4%

HSLhsl(349.2, 100%, 31.6%)

HSV / HSBhsv(349.2, 100%, 63.1%)

CMYK0%, 100%, 82%, 36.9%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer10,551,325

CSS custom property--colour: #A1001D;

Brightness & contrast

Relative luminance0.07666WCAG 2.x, 0 is black and 1 is white

Perceived brightness88.6 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 8.29:1

Contrast with white8.29:1WCAG normal text: AAA

Contrast with black2.53:1WCAG normal text: Fail

Greyscale equivalent#242424

Inverted#5EFFE2

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#403A1Cno red cones; affects about 1% of men; ΔE 61.9 from the original

Deuteranopia#645915no green cones; the most common form, about 1% of men; ΔE 61.4 from the original

Tritanopia#B20011no blue cones; rare, and affects men and women equally; ΔE 12.3 from the original

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

Contrast with white, large text8.29:1WCAG large text: AAA

Contrast with black, large text2.53:1WCAG large text: Fail

Named colours

Firebrick · ΔE 7.3 Brown · ΔE 9.2 Dark red · ΔE 11.3 Maroon · ΔE 12.9 Crimson · ΔE 19.4 Indian red · ΔE 26.3

Nearest named CSS colourFirebrick (#B22222)ΔE 7.3, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00A184

Analogous#A1006E, #A13300

Triadic#1DA100, #001DA1

Split complementary#00A133, #006EA1

Tetradic#6EA100, #00A184, #3300A1

Tints, shades & saturation

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

Lighter +40%#FF6E88

Lighter +30%#FF3B5E

Lighter +20%#FF0834

Lighter +10%#D40026

Darker −10%#6E0014

Darker −20%#3B000B

Darker −30%#080001

Darker −40%#000000

More saturated +25%#A1001D

Less saturated −25%#8D142A

Channel breakdown

R161

B29

Red161 (63.1%)

Green0 (0%)

Blue29 (11.4%)

Hue349.19°

Saturation (HSL)100%

Lightness31.57%

Dominant channelRed

Hex per channelR A1 · G 00 · B 1D

Keep nerding

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

#A1001D

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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