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Recognised as Colour

#311F1B

  • #311F1B
  • Red
  • Dark
  • Nearest: Black

#311F1B is a red with RGB values 49, 31, 27 and HSL 11°, 29%, 15%. It is a dark colour, so white text on it reaches 15.6:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#311F1B#311F1B
HEX#311F1B
RGBrgb(49, 31, 27)
RGB (0–1)0.1922, 0.1216, 0.1059
RGB percentages19.2%, 12.2%, 10.6%
HSLhsl(10.9, 28.9%, 14.9%)
HSV / HSBhsv(10.9, 44.9%, 19.2%)
CMYK0%, 36.7%, 44.9%, 80.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,219,227
CSS custom property--colour: #311F1B;

Brightness & contrast

Relative luminance0.01712WCAG 2.x, 0 is black and 1 is white
Perceived brightness36.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.64:1
Contrast with white15.64:1WCAG normal text: AAA
Contrast with black1.34:1WCAG normal text: Fail
Greyscale equivalent#232323
Inverted#CEE0E4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#23211Bno red cones; affects about 1% of men; ΔE 8.8 from the original
Deuteranopia#27251Bno green cones; the most common form, about 1% of men; ΔE 9.4 from the original
Tritanopia#351D1Eno blue cones; rare, and affects men and women equally; ΔE 4.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.64:1WCAG large text: AAA
Contrast with black, large text1.34:1WCAG large text: Fail

Named colours

Black · ΔE 17.3Dark slate grey · ΔE 28.2Dim grey · ΔE 32.2Gray · ΔE 41Slate grey · ΔE 43.6Saddle brown · ΔE 45.8
Nearest named CSS colourBlack (#000000)ΔE 17.27, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#1B2D31
Analogous#311B22, #312A1B
Triadic#1B311F, #1F1B31
Split complementary#1B312A, #1B2231
Tetradic#22311B, #1B2D31, #2A1B31

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#AD776B
Lighter +30%#945D51
Lighter +20%#73493F
Lighter +10%#52342D
Darker −10%#100A09
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#3B1911
Less saturated −25%#282525

Channel breakdown

R49
G31
B27
Red49 (19.2%)
Green31 (12.2%)
Blue27 (10.6%)
Hue10.91°
Saturation (HSL)28.95%
Lightness14.9%
Dominant channelRed
Hex per channelR 31 · G 1F · B 1B

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Every value on this page was computed from “311f1b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.