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Recognised as Colour

#1F40D9

  • #1F40D9
  • Blue
  • Dark
  • Nearest: Medium slateblue

#1F40D9 is a blue with RGB values 31, 64, 217 and HSL 229°, 75%, 49%. It is a dark colour, so white text on it reaches 7.5:1 contrast (AAA for normal text). The nearest named colour is Medium slateblue.

Colour values

#1F40D9#1F40D9
HEX#1F40D9
RGBrgb(31, 64, 217)
RGB (0–1)0.1216, 0.251, 0.851
RGB percentages12.2%, 25.1%, 85.1%
HSLhsl(229.4, 75%, 48.6%)
HSV / HSBhsv(229.4, 85.7%, 85.1%)
CMYK85.7%, 70.5%, 0%, 14.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,048,217
CSS custom property--colour: #1F40D9;

Brightness & contrast

Relative luminance0.08968WCAG 2.x, 0 is black and 1 is white
Perceived brightness89.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.52:1
Contrast with white7.52:1WCAG normal text: AAA
Contrast with black2.79:1WCAG normal text: Fail
Greyscale equivalent#444444
Inverted#E0BF26

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#005EDEno red cones; affects about 1% of men; ΔE 21.6 from the original
Deuteranopia#004BD6no green cones; the most common form, about 1% of men; ΔE 10.3 from the original
Tritanopia#006C88no blue cones; rare, and affects men and women equally; ΔE 84.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.52:1WCAG large text: AAA
Contrast with black, large text2.79:1WCAG large text: Fail

Named colours

Medium slateblue · ΔE 22.5Dark blue · ΔE 24.5Blue violet · ΔE 25.3Slate blue · ΔE 26.3Medium blue · ΔE 26.4Royal blue · ΔE 27.4
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 22.53, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D9B81F
Analogous#1F9DD9, #5B1FD9
Triadic#D91F40, #40D91F
Split complementary#D95B1F, #9DD91F
Tetradic#D91F9D, #D9B81F, #1FD95B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CCD4F8
Lighter +30%#A0AEF1
Lighter +20%#7388EB
Lighter +10%#4662E5
Darker −10%#1933AC
Darker −20%#122680
Darker −30%#0C1953
Darker −40%#050B26
More saturated +25%#002CF8
Less saturated −25%#3E54BA

Channel breakdown

R31
G64
B217
Red31 (12.2%)
Green64 (25.1%)
Blue217 (85.1%)
Hue229.35°
Saturation (HSL)75%
Lightness48.63%
Dominant channelBlue
Hex per channelR 1F · G 40 · B D9

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Every value on this page was computed from “1f40d9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.