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Recognised as Colour

#31357B

  • #31357B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#31357B is a blue with RGB values 49, 53, 123 and HSL 237°, 43%, 34%. 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

#31357B#31357B
HEX#31357B
RGBrgb(49, 53, 123)
RGB (0–1)0.1922, 0.2078, 0.4824
RGB percentages19.2%, 20.8%, 48.2%
HSLhsl(236.8, 43%, 33.7%)
HSV / HSBhsv(236.8, 60.2%, 48.2%)
CMYK60.2%, 56.9%, 0%, 51.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,224,955
CSS custom property--colour: #31357B;

Brightness & contrast

Relative luminance0.04629WCAG 2.x, 0 is black and 1 is white
Perceived brightness64 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.9:1
Contrast with white10.9:1WCAG normal text: AAA
Contrast with black1.93:1WCAG normal text: Fail
Greyscale equivalent#393939
Inverted#CECA84

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#05407Dno red cones; affects about 1% of men; ΔE 12.8 from the original
Deuteranopia#003A7Ano green cones; the most common form, about 1% of men; ΔE 10.1 from the original
Tritanopia#014552no blue cones; rare, and affects men and women equally; ΔE 44.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.9:1WCAG large text: AAA
Contrast with black, large text1.93:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 7.5Midnight blue · ΔE 17.2Rebecca purple · ΔE 24.2Slate blue · ΔE 30.3Royal blue · ΔE 33.7Indigo · ΔE 33.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 7.53, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7B7731
Analogous#315A7B, #52317B
Triadic#7B3135, #357B31
Split complementary#7B5231, #5A7B31
Tetradic#7B315A, #7B7731, #317B52

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9FA2D9
Lighter +30%#7B7FCA
Lighter +20%#565CBC
Lighter +10%#40459F
Darker −10%#222557
Darker −20%#141632
Darker −30%#05060E
Darker −40%#000000
More saturated +25%#1C2291
Less saturated −25%#474866

Channel breakdown

R49
G53
B123
Red49 (19.2%)
Green53 (20.8%)
Blue123 (48.2%)
Hue236.76°
Saturation (HSL)43.02%
Lightness33.73%
Dominant channelBlue
Hex per channelR 31 · G 35 · B 7B

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Every value on this page was computed from “31357b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.