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Recognised as Colour

#1B1717

  • #1B1717
  • Red
  • Dark
  • Nearest: Black

#1B1717 is a red with RGB values 27, 23, 23 and HSL 0°, 8%, 10%. It is a dark colour, so white text on it reaches 17.8:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#1B1717#1B1717
HEX#1B1717
RGBrgb(27, 23, 23)
RGB (0–1)0.1059, 0.0902, 0.0902
RGB percentages10.6%, 9%, 9%
HSLhsl(0, 8%, 9.8%)
HSV / HSBhsv(0, 14.8%, 10.6%)
CMYK0%, 14.8%, 14.8%, 89.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,775,383
CSS custom property--colour: #1B1717;

Brightness & contrast

Relative luminance0.00908WCAG 2.x, 0 is black and 1 is white
Perceived brightness24.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.77:1
Contrast with white17.77:1WCAG normal text: AAA
Contrast with black1.18:1WCAG normal text: Fail
Greyscale equivalent#181818
Inverted#E4E8E8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#181717no red cones; affects about 1% of men; ΔE 1.6 from the original
Deuteranopia#191817no green cones; the most common form, about 1% of men; ΔE 1.8 from the original
Tritanopia#1C1717no blue cones; rare, and affects men and women equally; ΔE 0.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.77:1WCAG large text: AAA
Contrast with black, large text1.18:1WCAG large text: Fail

Named colours

Black · ΔE 8.5Dark slate grey · ΔE 27.2Dim grey · ΔE 36.3Gray · ΔE 45.4Slate grey · ΔE 46.2Light slate grey · ΔE 49.3
Nearest named CSS colourBlack (#000000)ΔE 8.47, clearly different but related
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#171B1B
Analogous#1B1719, #1B1917
Triadic#171B17, #17171B
Split complementary#171B19, #17191B
Tetradic#191B17, #171B1B, #19171B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#897575
Lighter +30%#6E5D5D
Lighter +20%#524646
Lighter +10%#372E2E
Darker −10%#000000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#211111
Less saturated −25%#191919

Channel breakdown

R27
G23
B23
Red27 (10.6%)
Green23 (9%)
Blue23 (9%)
Hue0°
Saturation (HSL)8%
Lightness9.8%
Dominant channelRed
Hex per channelR 1B · G 17 · B 17

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Every value on this page was computed from “1b1717” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.