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Recognised as Colour

#21040D

  • #21040D
  • Red
  • Dark
  • Nearest: Black

#21040D is a red with RGB values 33, 4, 13 and HSL 341°, 78%, 7%. It is a dark colour, so white text on it reaches 19.3:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#21040D#21040D
HEX#21040D
RGBrgb(33, 4, 13)
RGB (0–1)0.1294, 0.0157, 0.051
RGB percentages12.9%, 1.6%, 5.1%
HSLhsl(341.4, 78.4%, 7.3%)
HSV / HSBhsv(341.4, 87.9%, 12.9%)
CMYK0%, 87.9%, 60.6%, 87.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,163,725
CSS custom property--colour: #21040D;

Brightness & contrast

Relative luminance0.00439WCAG 2.x, 0 is black and 1 is white
Perceived brightness18.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 19.3:1
Contrast with white19.3:1WCAG normal text: AAA
Contrast with black1.09:1WCAG normal text: Fail
Greyscale equivalent#0B0B0B
Inverted#DEFBF2

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#090A0Dno red cones; affects about 1% of men; ΔE 13.4 from the original
Deuteranopia#11100Cno green cones; the most common form, about 1% of men; ΔE 13.7 from the original
Tritanopia#250207no blue cones; rare, and affects men and women equally; ΔE 3.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text19.3:1WCAG large text: AAA
Contrast with black, large text1.09:1WCAG large text: Fail

Named colours

Black · ΔE 13.9Dark slate grey · ΔE 37.3Dim grey · ΔE 42.6Gray · ΔE 51.4Dark slateblue · ΔE 52.1Slate grey · ΔE 52.5
Nearest named CSS colourBlack (#000000)ΔE 13.94, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#042118
Analogous#21041C, #210904
Triadic#0D2104, #040D21
Split complementary#042109, #041C21
Tetradic#1C2104, #042118, #090421

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D71A55
Lighter +30%#A91543
Lighter +20%#7C0F31
Lighter +10%#4E0A1F
Darker −10%#000000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#25000B
Less saturated −25%#1C090F

Channel breakdown

R33
G4
B13
Red33 (12.9%)
Green4 (1.6%)
Blue13 (5.1%)
Hue341.38°
Saturation (HSL)78.38%
Lightness7.25%
Dominant channelRed
Hex per channelR 21 · G 04 · B 0D

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Every value on this page was computed from “21040d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.