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Recognised as Colour

#1F3DAD

  • #1F3DAD
  • Blue
  • Dark
  • Nearest: Slate blue

#1F3DAD is a blue with RGB values 31, 61, 173 and HSL 227°, 70%, 40%. It is a dark colour, so white text on it reaches 9:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#1F3DAD#1F3DAD
HEX#1F3DAD
RGBrgb(31, 61, 173)
RGB (0–1)0.1216, 0.2392, 0.6784
RGB percentages12.2%, 23.9%, 67.8%
HSLhsl(227.3, 69.6%, 40%)
HSV / HSBhsv(227.3, 82.1%, 67.8%)
CMYK82.1%, 64.7%, 0%, 32.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,047,405
CSS custom property--colour: #1F3DAD;

Brightness & contrast

Relative luminance0.06646WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.02:1
Contrast with white9.02:1WCAG normal text: AAA
Contrast with black2.33:1WCAG normal text: Fail
Greyscale equivalent#3F3F3F
Inverted#E0C252

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0050B1no red cones; affects about 1% of men; ΔE 14.8 from the original
Deuteranopia#0042ABno green cones; the most common form, about 1% of men; ΔE 6.1 from the original
Tritanopia#005B6Fno blue cones; rare, and affects men and women equally; ΔE 65 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.02:1WCAG large text: AAA
Contrast with black, large text2.33:1WCAG large text: Fail

Named colours

Slate blue · ΔE 15.7Royal blue · ΔE 17.9Rebecca purple · ΔE 19.1Midnight blue · ΔE 20Dark slateblue · ΔE 21.3Medium slateblue · ΔE 23.3
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 15.74, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AD8F1F
Analogous#1F84AD, #481FAD
Triadic#AD1F3D, #3DAD1F
Split complementary#AD481F, #84AD1F
Tetradic#AD1F84, #AD8F1F, #1FAD48

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A9B8F0
Lighter +30%#7D94E8
Lighter +20%#5270E0
Lighter +10%#274CD8
Darker −10%#172E82
Darker −20%#101E57
Darker −30%#080F2B
Darker −40%#000000
More saturated +25%#062EC7
Less saturated −25%#394C94

Channel breakdown

R31
G61
B173
Red31 (12.2%)
Green61 (23.9%)
Blue173 (67.8%)
Hue227.32°
Saturation (HSL)69.61%
Lightness40%
Dominant channelBlue
Hex per channelR 1F · G 3D · B AD

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Every value on this page was computed from “1f3dad” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.