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Recognised as Colour

#1B313B

  • #1B313B
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#1B313B is a cyan with RGB values 27, 49, 59 and HSL 199°, 37%, 17%. It is a dark colour, so white text on it reaches 13.6:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#1B313B#1B313B
HEX#1B313B
RGBrgb(27, 49, 59)
RGB (0–1)0.1059, 0.1922, 0.2314
RGB percentages10.6%, 19.2%, 23.1%
HSLhsl(198.8, 37.2%, 16.9%)
HSV / HSBhsv(198.8, 54.2%, 23.1%)
CMYK54.2%, 16.9%, 0%, 76.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,782,075
CSS custom property--colour: #1B313B;

Brightness & contrast

Relative luminance0.02745WCAG 2.x, 0 is black and 1 is white
Perceived brightness45 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.56:1
Contrast with white13.56:1WCAG normal text: AAA
Contrast with black1.55:1WCAG normal text: Fail
Greyscale equivalent#2D2D2D
Inverted#E4CEC4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2C303Cno red cones; affects about 1% of men; ΔE 7 from the original
Deuteranopia#272D3Bno green cones; the most common form, about 1% of men; ΔE 6.8 from the original
Tritanopia#0C3434no blue cones; rare, and affects men and women equally; ΔE 9.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text13.56:1WCAG large text: AAA
Contrast with black, large text1.55:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 14.8Black · ΔE 21.7Dim grey · ΔE 27.5Slate grey · ΔE 34Gray · ΔE 36.2Light slate grey · ΔE 37.1
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 14.79, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3B251B
Analogous#1B3B35, #1B213B
Triadic#3B1B31, #313B1B
Split complementary#3B1B21, #3B351B
Tetradic#351B3B, #3B251B, #213B1B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#68A0BA
Lighter +30%#4B88A4
Lighter +20%#3B6B81
Lighter +10%#2B4E5E
Darker −10%#0B1418
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#103546
Less saturated −25%#262D30

Channel breakdown

R27
G49
B59
Red27 (10.6%)
Green49 (19.2%)
Blue59 (23.1%)
Hue198.75°
Saturation (HSL)37.21%
Lightness16.86%
Dominant channelBlue
Hex per channelR 1B · G 31 · B 3B

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Every value on this page was computed from “1b313b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.