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Recognised as Colour

#3666AF

  • #3666AF
  • Blue
  • Dark
  • Nearest: Steel blue

#3666AF is a blue with RGB values 54, 102, 175 and HSL 216°, 53%, 45%. It is a dark colour, so white text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#3666AF#3666AF
HEX#3666AF
RGBrgb(54, 102, 175)
RGB (0–1)0.2118, 0.4, 0.6863
RGB percentages21.2%, 40%, 68.6%
HSLhsl(216.2, 52.8%, 44.9%)
HSV / HSBhsv(216.2, 69.1%, 68.6%)
CMYK69.1%, 41.7%, 0%, 31.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,565,231
CSS custom property--colour: #3666AF;

Brightness & contrast

Relative luminance0.13382WCAG 2.x, 0 is black and 1 is white
Perceived brightness102.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.71:1
Contrast with white5.71:1WCAG normal text: AA
Contrast with black3.68:1WCAG normal text: Fail
Greyscale equivalent#616161
Inverted#C99950

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#446CB2no red cones; affects about 1% of men; ΔE 3.4 from the original
Deuteranopia#3161AEno green cones; the most common form, about 1% of men; ΔE 3.4 from the original
Tritanopia#007782no blue cones; rare, and affects men and women equally; ΔE 43.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text5.71:1WCAG large text: AAA
Contrast with black, large text3.68:1WCAG large text: AA

Named colours

Steel blue · ΔE 19.3Cornflower blue · ΔE 19.4Dark slateblue · ΔE 21.7Dodgerblue · ΔE 25.4Royal blue · ΔE 28.3Slate blue · ΔE 31.1
Nearest named CSS colourSteel blue (#4682B4)ΔE 19.28, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AF7F36
Analogous#36A2AF, #4336AF
Triadic#AF3666, #66AF36
Split complementary#AF4336, #A2AF36
Tetradic#AF36A2, #AF7F36, #36AF43

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C4D4ED
Lighter +30%#9DB8E1
Lighter +20%#769CD5
Lighter +10%#4F7FC9
Darker −10%#2A4F88
Darker −20%#1E3961
Darker −30%#12223A
Darker −40%#060B13
More saturated +25%#1960CC
Less saturated −25%#536C92

Channel breakdown

R54
G102
B175
Red54 (21.2%)
Green102 (40%)
Blue175 (68.6%)
Hue216.2°
Saturation (HSL)52.84%
Lightness44.9%
Dominant channelBlue
Hex per channelR 36 · G 66 · B AF

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Every value on this page was computed from “3666af” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.