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Recognised as Colour

#231A4B

  • #231A4B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#231A4B is a blue with RGB values 35, 26, 75 and HSL 251°, 49%, 20%. It is a dark colour, so white text on it reaches 15.9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#231A4B#231A4B
HEX#231A4B
RGBrgb(35, 26, 75)
RGB (0–1)0.1373, 0.102, 0.2941
RGB percentages13.7%, 10.2%, 29.4%
HSLhsl(251, 48.5%, 19.8%)
HSV / HSBhsv(251, 65.3%, 29.4%)
CMYK53.3%, 65.3%, 0%, 70.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,300,491
CSS custom property--colour: #231A4B;

Brightness & contrast

Relative luminance0.01604WCAG 2.x, 0 is black and 1 is white
Perceived brightness37.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.9:1
Contrast with white15.9:1WCAG normal text: AAA
Contrast with black1.32:1WCAG normal text: Fail
Greyscale equivalent#1F1F1F
Inverted#DCE5B4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00234Dno red cones; affects about 1% of men; ΔE 12.1 from the original
Deuteranopia#00214Ano green cones; the most common form, about 1% of men; ΔE 12 from the original
Tritanopia#15252Fno blue cones; rare, and affects men and women equally; ΔE 30.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.9:1WCAG large text: AAA
Contrast with black, large text1.32:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 22.9Midnight blue · ΔE 24.2Rebecca purple · ΔE 35.7Black · ΔE 37.3Indigo · ΔE 41.2Purple · ΔE 43.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 22.91, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#424B1A
Analogous#1A2A4B, #3C1A4B
Triadic#4B231A, #1A4B23
Split complementary#4B3C1A, #2A4B1A
Tetradic#4B1A2A, #424B1A, #1A4B3C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7967CA
Lighter +30%#5841BD
Lighter +20%#463497
Lighter +10%#352771
Darker −10%#110D25
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#1B0D58
Less saturated −25%#2B273E

Channel breakdown

R35
G26
B75
Red35 (13.7%)
Green26 (10.2%)
Blue75 (29.4%)
Hue251.02°
Saturation (HSL)48.51%
Lightness19.8%
Dominant channelBlue
Hex per channelR 23 · G 1A · B 4B

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Every value on this page was computed from “231a4b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.