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Recognised as Colour

#1F3B73

  • #1F3B73
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1F3B73 is a blue with RGB values 31, 59, 115 and HSL 220°, 58%, 29%. It is a dark colour, so white text on it reaches 10.9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1F3B73#1F3B73
HEX#1F3B73
RGBrgb(31, 59, 115)
RGB (0–1)0.1216, 0.2314, 0.451
RGB percentages12.2%, 23.1%, 45.1%
HSLhsl(220, 57.5%, 28.6%)
HSV / HSBhsv(220, 73%, 45.1%)
CMYK73%, 48.7%, 0%, 54.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,046,835
CSS custom property--colour: #1F3B73;

Brightness & contrast

Relative luminance0.04657WCAG 2.x, 0 is black and 1 is white
Perceived brightness62 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.87:1
Contrast with white10.87:1WCAG normal text: AAA
Contrast with black1.93:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#E0C48C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1E4175no red cones; affects about 1% of men; ΔE 4.4 from the original
Deuteranopia#0C3972no green cones; the most common form, about 1% of men; ΔE 2.5 from the original
Tritanopia#004851no blue cones; rare, and affects men and women equally; ΔE 35.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.87:1WCAG large text: AAA
Contrast with black, large text1.93:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 17.9Midnight blue · ΔE 27.6Steel blue · ΔE 30.5Rebecca purple · ΔE 35.5Slate grey · ΔE 38.8Cornflower blue · ΔE 38.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 17.94, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#73571F
Analogous#1F6573, #2D1F73
Triadic#731F3B, #3B731F
Split complementary#732D1F, #65731F
Tetradic#731F65, #73571F, #1F732D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#81A0DD
Lighter +30%#5981D2
Lighter +20%#3564C3
Lighter +10%#2A509B
Darker −10%#14264B
Darker −20%#091223
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0D3585
Less saturated −25%#314161

Channel breakdown

R31
G59
B115
Red31 (12.2%)
Green59 (23.1%)
Blue115 (45.1%)
Hue220°
Saturation (HSL)57.53%
Lightness28.63%
Dominant channelBlue
Hex per channelR 1F · G 3B · B 73

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Every value on this page was computed from “1f3b73” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.