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Recognised as Colour

#1F3881

  • #1F3881
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1F3881 is a blue with RGB values 31, 56, 129 and HSL 225°, 61%, 31%. It is a dark colour, so white text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1F3881#1F3881
HEX#1F3881
RGBrgb(31, 56, 129)
RGB (0–1)0.1216, 0.2196, 0.5059
RGB percentages12.2%, 22%, 50.6%
HSLhsl(224.7, 61.2%, 31.4%)
HSV / HSBhsv(224.7, 76%, 50.6%)
CMYK76%, 56.6%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,046,081
CSS custom property--colour: #1F3881;

Brightness & contrast

Relative luminance0.04705WCAG 2.x, 0 is black and 1 is white
Perceived brightness63.4 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#383838
Inverted#E0C77E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004284no red cones; affects about 1% of men; ΔE 9 from the original
Deuteranopia#003980no green cones; the most common form, about 1% of men; ΔE 3.9 from the original
Tritanopia#004A56no blue cones; rare, and affects men and women equally; ΔE 45.6 from the original
Distinguishable without hueYesnever 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

Dark slateblue · ΔE 9.7Midnight blue · ΔE 17.9Rebecca purple · ΔE 26.1Slate blue · ΔE 29.9Royal blue · ΔE 31.7Medium purple · ΔE 35.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 9.71, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#81681F
Analogous#1F6981, #371F81
Triadic#811F38, #38811F
Split complementary#81371F, #69811F
Tetradic#811F69, #81681F, #1F8137

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#89A0E3
Lighter +30%#607FD9
Lighter +20%#375ECF
Lighter +10%#294AAA
Darker −10%#152658
Darker −20%#0B142F
Darker −30%#010206
Darker −40%#000000
More saturated +25%#0B2E95
Less saturated −25%#33426D

Channel breakdown

R31
G56
B129
Red31 (12.2%)
Green56 (22%)
Blue129 (50.6%)
Hue224.69°
Saturation (HSL)61.25%
Lightness31.37%
Dominant channelBlue
Hex per channelR 1F · G 38 · B 81

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Every value on this page was computed from “1f3881” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.