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Recognised as Colour

#1B4D91

  • #1B4D91
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1B4D91 is a blue with RGB values 27, 77, 145 and HSL 215°, 69%, 34%. It is a dark colour, so white text on it reaches 8.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1B4D91#1B4D91
HEX#1B4D91
RGBrgb(27, 77, 145)
RGB (0–1)0.1059, 0.302, 0.5686
RGB percentages10.6%, 30.2%, 56.9%
HSLhsl(214.6, 68.6%, 33.7%)
HSV / HSBhsv(214.6, 81.4%, 56.9%)
CMYK81.4%, 46.9%, 0%, 43.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,789,329
CSS custom property--colour: #1B4D91;

Brightness & contrast

Relative luminance0.07585WCAG 2.x, 0 is black and 1 is white
Perceived brightness78.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.34:1
Contrast with white8.34:1WCAG normal text: AAA
Contrast with black2.52:1WCAG normal text: Fail
Greyscale equivalent#474747
Inverted#E4B26E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#295494no red cones; affects about 1% of men; ΔE 4.2 from the original
Deuteranopia#0B4990no green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#005D68no blue cones; rare, and affects men and women equally; ΔE 40.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.34:1WCAG large text: AAA
Contrast with black, large text2.52:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 16.8Steel blue · ΔE 25.7Midnight blue · ΔE 29.1Cornflower blue · ΔE 29.7Royal blue · ΔE 32.1Slate blue · ΔE 33.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 16.78, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#915F1B
Analogous#1B8891, #241B91
Triadic#911B4D, #4D911B
Split complementary#91241B, #88911B
Tetradic#911B88, #915F1B, #1B9124

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8EB5EA
Lighter +30%#6399E2
Lighter +20%#387DDA
Lighter +10%#2364BC
Darker −10%#133666
Darker −20%#0B1F3B
Darker −30%#030910
Darker −40%#000000
More saturated +25%#054AA6
Less saturated −25%#30507B

Channel breakdown

R27
G77
B145
Red27 (10.6%)
Green77 (30.2%)
Blue145 (56.9%)
Hue214.58°
Saturation (HSL)68.6%
Lightness33.73%
Dominant channelBlue
Hex per channelR 1B · G 4D · B 91

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Every value on this page was computed from “1b4d91” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.