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Recognised as Colour

#31388B

  • #31388B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#31388B is a blue with RGB values 49, 56, 139 and HSL 235°, 48%, 37%. It is a dark colour, so white text on it reaches 10.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#31388B#31388B
HEX#31388B
RGBrgb(49, 56, 139)
RGB (0–1)0.1922, 0.2196, 0.5451
RGB percentages19.2%, 22%, 54.5%
HSLhsl(235.3, 47.9%, 36.9%)
HSV / HSBhsv(235.3, 64.7%, 54.5%)
CMYK64.7%, 59.7%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,225,739
CSS custom property--colour: #31388B;

Brightness & contrast

Relative luminance0.05345WCAG 2.x, 0 is black and 1 is white
Perceived brightness69 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.15:1
Contrast with white10.15:1WCAG normal text: AAA
Contrast with black2.07:1WCAG normal text: Fail
Greyscale equivalent#3D3D3D
Inverted#CEC774

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00458Eno red cones; affects about 1% of men; ΔE 13.2 from the original
Deuteranopia#003E89no green cones; the most common form, about 1% of men; ΔE 10.2 from the original
Tritanopia#004C5Cno blue cones; rare, and affects men and women equally; ΔE 50.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.15:1WCAG large text: AAA
Contrast with black, large text2.07:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 6.2Midnight blue · ΔE 14Rebecca purple · ΔE 19Slate blue · ΔE 23.5Royal blue · ΔE 27.1Indigo · ΔE 28.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 6.21, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B8431
Analogous#31658B, #57318B
Triadic#8B3138, #388B31
Split complementary#8B5731, #658B31
Tetradic#8B3165, #8B8431, #318B57

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A8ACE0
Lighter +30%#8288D3
Lighter +20%#5C65C6
Lighter +10%#3E47B1
Darker −10%#242965
Darker −20%#161A40
Darker −30%#090A1A
Darker −40%#000000
More saturated +25%#1924A3
Less saturated −25%#494C74

Channel breakdown

R49
G56
B139
Red49 (19.2%)
Green56 (22%)
Blue139 (54.5%)
Hue235.33°
Saturation (HSL)47.87%
Lightness36.86%
Dominant channelBlue
Hex per channelR 31 · G 38 · B 8B

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Every value on this page was computed from “31388b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.