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Colour

#1F3391

  • #1F3391
  • Blue
  • Dark
  • Nearest: Midnight blue

#1F3391 is a blue with RGB values 31, 51, 145 and HSL 229°, 65%, 35%. It is a dark colour, so white text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#1F3391#1F3391
HEX#1F3391
RGBrgb(31, 51, 145)
RGB (0–1)0.1216, 0.2, 0.5686
RGB percentages12.2%, 20%, 56.9%
HSLhsl(229.5, 64.8%, 34.5%)
HSV / HSBhsv(229.5, 78.6%, 56.9%)
CMYK78.6%, 64.8%, 0%, 43.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,044,817
CSS custom property--colour: #1F3391;

Brightness & contrast

Relative luminance0.04703WCAG 2.x, 0 is black and 1 is white
Perceived brightness64.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.82:1
Contrast with white10.82:1WCAG normal text: AAA
Contrast with black1.94:1WCAG normal text: Fail
Greyscale equivalent#363636
Inverted#E0CC6E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004394no red cones; affects about 1% of men; ΔE 13.4 from the original
Deuteranopia#00388Fno green cones; the most common form, about 1% of men; ΔE 6.7 from the original
Tritanopia#004C5Dno blue cones; rare, and affects men and women equally; ΔE 56.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.82:1WCAG large text: AAA
Contrast with black, large text1.94:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 11.7Dark slateblue · ΔE 13Rebecca purple · ΔE 18.1Slate blue · ΔE 21.5Indigo · ΔE 24.6Royal blue · ΔE 24.7
Nearest named CSS colourMidnight blue (#191970)ΔE 11.65, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#917D1F
Analogous#1F6C91, #441F91
Triadic#911F33, #33911F
Split complementary#91441F, #6C911F
Tetradic#911F6C, #917D1F, #1F9144

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#94A3E8
Lighter +30%#6A7EDF
Lighter +20%#405AD6
Lighter +10%#2842BB
Darker −10%#162467
Darker −20%#0D153D
Darker −30%#040713
Darker −40%#000000
More saturated +25%#0925A7
Less saturated −25%#35417B

Channel breakdown

R31
G51
B145
Red31 (12.2%)
Green51 (20%)
Blue145 (56.9%)
Hue229.47°
Saturation (HSL)64.77%
Lightness34.51%
Dominant channelBlue
Hex per channelR 1F · G 33 · B 91

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Every value on this page was computed from “1f3391” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.