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Colour

#21457C

  • #21457C
  • Blue
  • Dark
  • Nearest: Dark slateblue

#21457C is a blue with RGB values 33, 69, 124 and HSL 216°, 58%, 31%. It is a dark colour, so white text on it reaches 9.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#21457C#21457C
HEX#21457C
RGBrgb(33, 69, 124)
RGB (0–1)0.1294, 0.2706, 0.4863
RGB percentages12.9%, 27.1%, 48.6%
HSLhsl(216.3, 58%, 30.8%)
HSV / HSBhsv(216.3, 73.4%, 48.6%)
CMYK73.4%, 44.4%, 0%, 51.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,180,476
CSS custom property--colour: #21457C;

Brightness & contrast

Relative luminance0.06035WCAG 2.x, 0 is black and 1 is white
Perceived brightness69.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.52:1
Contrast with white9.52:1WCAG normal text: AAA
Contrast with black2.21:1WCAG normal text: Fail
Greyscale equivalent#414141
Inverted#DEBA83

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2B4A7Eno red cones; affects about 1% of men; ΔE 3.1 from the original
Deuteranopia#1B427Bno green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#00525Ano blue cones; rare, and affects men and women equally; ΔE 35.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.52:1WCAG large text: AAA
Contrast with black, large text2.21:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 20.2Steel blue · ΔE 25.8Midnight blue · ΔE 31.6Slate grey · ΔE 35.1Cornflower blue · ΔE 35.5Dark slate grey · ΔE 36.6
Nearest named CSS colourDark slateblue (#483D8B)ΔE 20.15, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7C5821
Analogous#21727C, #2B217C
Triadic#7C2145, #457C21
Split complementary#7C2B21, #727C21
Tetradic#7C2172, #7C5821, #217C2B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#89ABE0
Lighter +30%#618FD5
Lighter +20%#3972CA
Lighter +10%#2C5BA4
Darker −10%#162F54
Darker −20%#0C182B
Darker −30%#010203
Darker −40%#000000
More saturated +25%#0D4190
Less saturated −25%#354968

Channel breakdown

R33
G69
B124
Red33 (12.9%)
Green69 (27.1%)
Blue124 (48.6%)
Hue216.26°
Saturation (HSL)57.96%
Lightness30.78%
Dominant channelBlue
Hex per channelR 21 · G 45 · B 7C

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Every value on this page was computed from “21457c” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.