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Colour

#A40047

  • #A40047
  • Red
  • Dark
  • Nearest: Brown

#A40047 is a red with RGB values 164, 0, 71 and HSL 334°, 100%, 32%. It is a dark colour, so white text on it reaches 7.9:1 contrast (AAA for normal text). The nearest named colour is Brown.

Colour values

#A40047#A40047
HEX#A40047
RGBrgb(164, 0, 71)
RGB (0–1)0.6431, 0, 0.2784
RGB percentages64.3%, 0%, 27.8%
HSLhsl(334, 100%, 32.2%)
HSV / HSBhsv(334, 100%, 64.3%)
CMYK0%, 100%, 56.7%, 35.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer10,747,975
CSS custom property--colour: #A40047;

Brightness & contrast

Relative luminance0.08347WCAG 2.x, 0 is black and 1 is white
Perceived brightness92.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.87:1
Contrast with white7.87:1WCAG normal text: AAA
Contrast with black2.67:1WCAG normal text: Fail
Greyscale equivalent#282828
Inverted#5BFFB8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3B3E48no red cones; affects about 1% of men; ΔE 61.3 from the original
Deuteranopia#625C43no green cones; the most common form, about 1% of men; ΔE 62.6 from the original
Tritanopia#B40028no blue cones; rare, and affects men and women equally; ΔE 24.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.87:1WCAG large text: AAA
Contrast with black, large text2.67:1WCAG large text: Fail

Named colours

Brown · ΔE 24.6Indian red · ΔE 27.7Medium violet red · ΔE 27.9Firebrick · ΔE 29.8Crimson · ΔE 30Pale violetred · ΔE 30.8
Nearest named CSS colourBrown (#A52A2A)ΔE 24.6, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#00A45D
Analogous#A40099, #A40B00
Triadic#47A400, #0047A4
Split complementary#00A40B, #0099A4
Tetradic#99A400, #00A45D, #0B00A4

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FF71AE
Lighter +30%#FF3E92
Lighter +20%#FF0B75
Lighter +10%#D7005D
Darker −10%#710031
Darker −20%#3E001B
Darker −30%#0B0005
Darker −40%#000000
More saturated +25%#A40047
Less saturated −25%#90144A

Channel breakdown

R164
G0
B71
Red164 (64.3%)
Green0 (0%)
Blue71 (27.8%)
Hue334.02°
Saturation (HSL)100%
Lightness32.16%
Dominant channelRed
Hex per channelR A4 · G 00 · B 47

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Every value on this page was computed from “a40047” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.