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Recognised as Colour

#21458A

  • #21458A
  • Blue
  • Dark
  • Nearest: Dark slateblue

#21458A is a blue with RGB values 33, 69, 138 and HSL 219°, 61%, 34%. It is a dark colour, so white text on it reaches 9.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#21458A#21458A
HEX#21458A
RGBrgb(33, 69, 138)
RGB (0–1)0.1294, 0.2706, 0.5412
RGB percentages12.9%, 27.1%, 54.1%
HSLhsl(219.4, 61.4%, 33.5%)
HSV / HSBhsv(219.4, 76.1%, 54.1%)
CMYK76.1%, 50%, 0%, 45.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,180,490
CSS custom property--colour: #21458A;

Brightness & contrast

Relative luminance0.06415WCAG 2.x, 0 is black and 1 is white
Perceived brightness72.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.2:1
Contrast with white9.2:1WCAG normal text: AAA
Contrast with black2.28:1WCAG normal text: Fail
Greyscale equivalent#424242
Inverted#DEBA75

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1E4D8Dno red cones; affects about 1% of men; ΔE 5.7 from the original
Deuteranopia#004389no green cones; the most common form, about 1% of men; ΔE 3 from the original
Tritanopia#005561no blue cones; rare, and affects men and women equally; ΔE 41.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.2:1WCAG large text: AAA
Contrast with black, large text2.28:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 13.3Midnight blue · ΔE 25Steel blue · ΔE 29.5Rebecca purple · ΔE 30.6Slate blue · ΔE 31.7Royal blue · ΔE 31.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 13.27, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8A6621
Analogous#21798A, #32218A
Triadic#8A2145, #458A21
Split complementary#8A3221, #798A21
Tetradic#8A2179, #8A6621, #218A32

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#92AEE5
Lighter +30%#6990DB
Lighter +20%#4072D1
Lighter +10%#2B5AB3
Darker −10%#173061
Darker −20%#0D1C38
Darker −30%#03070F
Darker −40%#000000
More saturated +25%#0C3E9F
Less saturated −25%#364C75

Channel breakdown

R33
G69
B138
Red33 (12.9%)
Green69 (27.1%)
Blue138 (54.1%)
Hue219.43°
Saturation (HSL)61.4%
Lightness33.53%
Dominant channelBlue
Hex per channelR 21 · G 45 · B 8A

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Every value on this page was computed from “21458a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.