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Recognised as Colour

#1637B1

  • #1637B1
  • Blue
  • Dark
  • Nearest: Slate blue

#1637B1 is a blue with RGB values 22, 55, 177 and HSL 227°, 78%, 39%. It is a dark colour, so white text on it reaches 9.5:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#1637B1#1637B1
HEX#1637B1
RGBrgb(22, 55, 177)
RGB (0–1)0.0863, 0.2157, 0.6941
RGB percentages8.6%, 21.6%, 69.4%
HSLhsl(227.2, 77.9%, 39%)
HSV / HSBhsv(227.2, 87.6%, 69.4%)
CMYK87.6%, 68.9%, 0%, 30.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,456,049
CSS custom property--colour: #1637B1;

Brightness & contrast

Relative luminance0.06077WCAG 2.x, 0 is black and 1 is white
Perceived brightness74.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.48:1
Contrast with white9.48:1WCAG normal text: AAA
Contrast with black2.22:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#E9C84E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004DB5no red cones; affects about 1% of men; ΔE 16.6 from the original
Deuteranopia#003EAFno green cones; the most common form, about 1% of men; ΔE 7.1 from the original
Tritanopia#00596Fno blue cones; rare, and affects men and women equally; ΔE 70.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.48:1WCAG large text: AAA
Contrast with black, large text2.22:1WCAG large text: Fail

Named colours

Slate blue · ΔE 18.4Navy · ΔE 20.1Dark blue · ΔE 20.4Royal blue · ΔE 21Rebecca purple · ΔE 21.3Indigo · ΔE 22.5
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 18.37, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B19016
Analogous#1684B1, #4316B1
Triadic#B11637, #37B116
Split complementary#B14316, #84B116
Tetradic#B11685, #B19016, #16B143

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A0B2F3
Lighter +30%#728DEE
Lighter +20%#4568E8
Lighter +10%#1C45DE
Darker −10%#102984
Darker −20%#0B1B56
Darker −30%#050D29
Darker −40%#000000
More saturated +25%#002AC7
Less saturated −25%#2F4598

Channel breakdown

R22
G55
B177
Red22 (8.6%)
Green55 (21.6%)
Blue177 (69.4%)
Hue227.23°
Saturation (HSL)77.89%
Lightness39.02%
Dominant channelBlue
Hex per channelR 16 · G 37 · B B1

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Every value on this page was computed from “1637b1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.