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Colour

#1B4487

  • #1B4487
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1B4487 is a blue with RGB values 27, 68, 135 and HSL 217°, 67%, 32%. It is a dark colour, so white text on it reaches 9.4:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1B4487#1B4487
HEX#1B4487
RGBrgb(27, 68, 135)
RGB (0–1)0.1059, 0.2667, 0.5294
RGB percentages10.6%, 26.7%, 52.9%
HSLhsl(217.2, 66.7%, 31.8%)
HSV / HSBhsv(217.2, 80%, 52.9%)
CMYK80%, 49.6%, 0%, 47.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,787,015
CSS custom property--colour: #1B4487;

Brightness & contrast

Relative luminance0.06117WCAG 2.x, 0 is black and 1 is white
Perceived brightness70.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.45:1
Contrast with white9.45:1WCAG normal text: AAA
Contrast with black2.22:1WCAG normal text: Fail
Greyscale equivalent#404040
Inverted#E4BB78

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1E4B89no red cones; affects about 1% of men; ΔE 5 from the original
Deuteranopia#004186no green cones; the most common form, about 1% of men; ΔE 2.6 from the original
Tritanopia#00545Fno blue cones; rare, and affects men and women equally; ΔE 41 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.45:1WCAG large text: AAA
Contrast with black, large text2.22:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 14.6Midnight blue · ΔE 25.8Steel blue · ΔE 29.1Rebecca purple · ΔE 32Cornflower blue · ΔE 33.2Royal blue · ΔE 33.3
Nearest named CSS colourDark slateblue (#483D8B)ΔE 14.61, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#875E1B
Analogous#1B7A87, #281B87
Triadic#871B44, #44871B
Split complementary#87281B, #7A871B
Tetradic#871B7A, #875E1B, #1B8728

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#87ABE7
Lighter +30%#5D8EDF
Lighter +20%#3270D6
Lighter +10%#2359B2
Darker −10%#122F5D
Darker −20%#0A1932
Darker −30%#010407
Darker −40%#000000
More saturated +25%#073F9B
Less saturated −25%#2F4973

Channel breakdown

R27
G68
B135
Red27 (10.6%)
Green68 (26.7%)
Blue135 (52.9%)
Hue217.22°
Saturation (HSL)66.67%
Lightness31.76%
Dominant channelBlue
Hex per channelR 1B · G 44 · B 87

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Every value on this page was computed from “1b4487” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.