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Recognised as Colour

#21457E

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

#21457E is a blue with RGB values 33, 69, 126 and HSL 217°, 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

#21457E#21457E
HEX#21457E
RGBrgb(33, 69, 126)
RGB (0–1)0.1294, 0.2706, 0.4941
RGB percentages12.9%, 27.1%, 49.4%
HSLhsl(216.8, 58.5%, 31.2%)
HSV / HSBhsv(216.8, 73.8%, 49.4%)
CMYK73.8%, 45.2%, 0%, 50.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,180,478
CSS custom property--colour: #21457E;

Brightness & contrast

Relative luminance0.06086WCAG 2.x, 0 is black and 1 is white
Perceived brightness70.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.47:1
Contrast with white9.47:1WCAG normal text: AAA
Contrast with black2.22:1WCAG normal text: Fail
Greyscale equivalent#414141
Inverted#DEBA81

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#294A80no red cones; affects about 1% of men; ΔE 3.1 from the original
Deuteranopia#18427Dno green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#00525Bno blue cones; rare, and affects men and women equally; ΔE 35.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.47:1WCAG large text: AAA
Contrast with black, large text2.22:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 19Steel blue · ΔE 26.1Midnight blue · ΔE 30.6Cornflower blue · ΔE 34.9Slate grey · ΔE 36Rebecca purple · ΔE 36.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 19.05, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7E5A21
Analogous#21747E, #2B217E
Triadic#7E2145, #457E21
Split complementary#7E2C21, #737E21
Tetradic#7E2174, #7E5A21, #217E2C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#8BACE0
Lighter +30%#628FD6
Lighter +20%#3A72CB
Lighter +10%#2C5BA6
Darker −10%#162F56
Darker −20%#0C192D
Darker −30%#010305
Darker −40%#000000
More saturated +25%#0D4192
Less saturated −25%#35496A

Channel breakdown

R33
G69
B126
Red33 (12.9%)
Green69 (27.1%)
Blue126 (49.4%)
Hue216.77°
Saturation (HSL)58.49%
Lightness31.18%
Dominant channelBlue
Hex per channelR 21 · G 45 · B 7E

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