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Recognised as Colour

#1B4247

  • #1B4247
  • Cyan
  • Dark
  • Nearest: Dark slate grey

#1B4247 is a cyan with RGB values 27, 66, 71 and HSL 187°, 45%, 19%. It is a dark colour, so white text on it reaches 11:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#1B4247#1B4247
HEX#1B4247
RGBrgb(27, 66, 71)
RGB (0–1)0.1059, 0.2588, 0.2784
RGB percentages10.6%, 25.9%, 27.8%
HSLhsl(186.8, 44.9%, 19.2%)
HSV / HSBhsv(186.8, 62%, 27.8%)
CMYK62%, 7%, 0%, 72.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,786,439
CSS custom property--colour: #1B4247;

Brightness & contrast

Relative luminance0.04584WCAG 2.x, 0 is black and 1 is white
Perceived brightness57.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.96:1
Contrast with white10.96:1WCAG normal text: AAA
Contrast with black1.92:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E4BDB8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3D3F47no red cones; affects about 1% of men; ΔE 13.3 from the original
Deuteranopia#363A47no green cones; the most common form, about 1% of men; ΔE 13.8 from the original
Tritanopia#004543no blue cones; rare, and affects men and women equally; ΔE 8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.96:1WCAG large text: AAA
Contrast with black, large text1.92:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 6.7Dim grey · ΔE 23.5Teal · ΔE 28.3Black · ΔE 29.1Slate grey · ΔE 29.2Gray · ΔE 31.4
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 6.73, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#47201B
Analogous#1B4736, #1B2C47
Triadic#471B42, #42471B
Split complementary#471B2C, #47361B
Tetradic#361B47, #47201B, #2C471B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#68BBC6
Lighter +30%#45A9B6
Lighter +20%#378791
Lighter +10%#29646C
Darker −10%#0D2022
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0F4B53
Less saturated −25%#27393B

Channel breakdown

R27
G66
B71
Red27 (10.6%)
Green66 (25.9%)
Blue71 (27.8%)
Hue186.82°
Saturation (HSL)44.9%
Lightness19.22%
Dominant channelBlue
Hex per channelR 1B · G 42 · B 47

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Every value on this page was computed from “1b4247” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.