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Colour

#1F0309

  • #1F0309
  • Red
  • Dark
  • Nearest: Black

#1F0309 is a red with RGB values 31, 3, 9 and HSL 347°, 82%, 7%. It is a dark colour, so white text on it reaches 19.5:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#1F0309#1F0309
HEX#1F0309
RGBrgb(31, 3, 9)
RGB (0–1)0.1216, 0.0118, 0.0353
RGB percentages12.2%, 1.2%, 3.5%
HSLhsl(347.1, 82.4%, 6.7%)
HSV / HSBhsv(347.1, 90.3%, 12.2%)
CMYK0%, 90.3%, 71%, 87.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,032,393
CSS custom property--colour: #1F0309;

Brightness & contrast

Relative luminance0.00376WCAG 2.x, 0 is black and 1 is white
Perceived brightness17.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 19.53:1
Contrast with white19.53:1WCAG normal text: AAA
Contrast with black1.08:1WCAG normal text: Fail
Greyscale equivalent#090909
Inverted#E0FCF6

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#080809no red cones; affects about 1% of men; ΔE 11.9 from the original
Deuteranopia#100E08no green cones; the most common form, about 1% of men; ΔE 12.1 from the original
Tritanopia#230105no blue cones; rare, and affects men and women equally; ΔE 3.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text19.53:1WCAG large text: AAA
Contrast with black, large text1.08:1WCAG large text: Fail

Named colours

Black · ΔE 12.4Dark slate grey · ΔE 36.9Dim grey · ΔE 42.7Gray · ΔE 51.6Slate grey · ΔE 52.8Dark slateblue · ΔE 53.5
Nearest named CSS colourBlack (#000000)ΔE 12.44, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#031F19
Analogous#1F0317, #1F0B03
Triadic#091F03, #03091F
Split complementary#031F0B, #03171F
Tetradic#171F03, #031F19, #0B031F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D9153F
Lighter +30%#AB1032
Lighter +20%#7C0C24
Lighter +10%#4E0717
Darker −10%#000000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#220007
Less saturated −25%#1B070B

Channel breakdown

R31
G3
B9
Red31 (12.2%)
Green3 (1.2%)
Blue9 (3.5%)
Hue347.14°
Saturation (HSL)82.35%
Lightness6.67%
Dominant channelRed
Hex per channelR 1F · G 03 · B 09

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Every value on this page was computed from “1f0309” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.