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Colour

#1F308F

  • #1F308F
  • Blue
  • Dark
  • Nearest: Midnight blue

#1F308F is a blue with RGB values 31, 48, 143 and HSL 231°, 64%, 34%. It is a dark colour, so white text on it reaches 11.2:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#1F308F#1F308F
HEX#1F308F
RGBrgb(31, 48, 143)
RGB (0–1)0.1216, 0.1882, 0.5608
RGB percentages12.2%, 18.8%, 56.1%
HSLhsl(230.9, 64.4%, 34.1%)
HSV / HSBhsv(230.9, 78.3%, 56.1%)
CMYK78.3%, 66.4%, 0%, 43.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,044,047
CSS custom property--colour: #1F308F;

Brightness & contrast

Relative luminance0.04388WCAG 2.x, 0 is black and 1 is white
Perceived brightness63 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.18:1
Contrast with white11.18:1WCAG normal text: AAA
Contrast with black1.88:1WCAG normal text: Fail
Greyscale equivalent#333333
Inverted#E0CF70

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004092no red cones; affects about 1% of men; ΔE 13.4 from the original
Deuteranopia#00368Dno green cones; the most common form, about 1% of men; ΔE 7.4 from the original
Tritanopia#00495Bno 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 text11.18:1WCAG large text: AAA
Contrast with black, large text1.88:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 10.6Dark slateblue · ΔE 13.9Rebecca purple · ΔE 17.6Slate blue · ΔE 21.9Indigo · ΔE 23.2Navy · ΔE 24.4
Nearest named CSS colourMidnight blue (#191970)ΔE 10.59, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8F7E1F
Analogous#1F688F, #461F8F
Triadic#8F1F30, #308F1F
Split complementary#8F461F, #688F1F
Tetradic#8F1F68, #8F7E1F, #1F8F46

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#939FE7
Lighter +30%#697ADE
Lighter +20%#3F56D5
Lighter +10%#283EB9
Darker −10%#162265
Darker −20%#0D143B
Darker −30%#040611
Darker −40%#000000
More saturated +25%#0921A5
Less saturated −25%#353F79

Channel breakdown

R31
G48
B143
Red31 (12.2%)
Green48 (18.8%)
Blue143 (56.1%)
Hue230.89°
Saturation (HSL)64.37%
Lightness34.12%
Dominant channelBlue
Hex per channelR 1F · G 30 · B 8F

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Every value on this page was computed from “1f308f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.