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Colour

#1F4188

  • #1F4188
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1F4188 is a blue with RGB values 31, 65, 136 and HSL 221°, 63%, 33%. It is a dark colour, so white text on it reaches 9.7:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1F4188#1F4188
HEX#1F4188
RGBrgb(31, 65, 136)
RGB (0–1)0.1216, 0.2549, 0.5333
RGB percentages12.2%, 25.5%, 53.3%
HSLhsl(220.6, 62.9%, 32.7%)
HSV / HSBhsv(220.6, 77.2%, 53.3%)
CMYK77.2%, 52.2%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,048,392
CSS custom property--colour: #1F4188;

Brightness & contrast

Relative luminance0.05849WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.68:1
Contrast with white9.68:1WCAG normal text: AAA
Contrast with black2.17:1WCAG normal text: Fail
Greyscale equivalent#3F3F3F
Inverted#E0BE77

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#154A8Bno red cones; affects about 1% of men; ΔE 7 from the original
Deuteranopia#004087no green cones; the most common form, about 1% of men; ΔE 2.9 from the original
Tritanopia#00525Eno blue cones; rare, and affects men and women equally; ΔE 43.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.68:1WCAG large text: AAA
Contrast with black, large text2.17:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.8Midnight blue · ΔE 22.6Rebecca purple · ΔE 28.9Slate blue · ΔE 30.7Royal blue · ΔE 31.2Steel blue · ΔE 31.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.78, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#88661F
Analogous#1F7688, #311F88
Triadic#881F41, #41881F
Split complementary#88311F, #76881F
Tetradic#881F76, #88661F, #1F8831

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8EAAE5
Lighter +30%#648BDC
Lighter +20%#3B6CD2
Lighter +10%#2855B2
Darker −10%#162D5E
Darker −20%#0C1935
Darker −30%#03050B
Darker −40%#000000
More saturated +25%#0A3A9D
Less saturated −25%#344873

Channel breakdown

R31
G65
B136
Red31 (12.2%)
Green65 (25.5%)
Blue136 (53.3%)
Hue220.57°
Saturation (HSL)62.87%
Lightness32.75%
Dominant channelBlue
Hex per channelR 1F · G 41 · B 88

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Every value on this page was computed from “1f4188” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.