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Recognised as Colour

#3F505F

  • #3F505F
  • Blue
  • Dark
  • Nearest: Dark slate grey

#3F505F is a blue with RGB values 63, 80, 95 and HSL 208°, 20%, 31%. It is a dark colour, so white text on it reaches 8.3:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#3F505F#3F505F
HEX#3F505F
RGBrgb(63, 80, 95)
RGB (0–1)0.2471, 0.3137, 0.3725
RGB percentages24.7%, 31.4%, 37.3%
HSLhsl(208.1, 20.3%, 31%)
HSV / HSBhsv(208.1, 33.7%, 37.3%)
CMYK33.7%, 15.8%, 0%, 62.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,149,343
CSS custom property--colour: #3F505F;

Brightness & contrast

Relative luminance0.0762WCAG 2.x, 0 is black and 1 is white
Perceived brightness77.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.32:1
Contrast with white8.32:1WCAG normal text: AAA
Contrast with black2.52:1WCAG normal text: Fail
Greyscale equivalent#4D4D4D
Inverted#C0AFA0

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#4A5060no red cones; affects about 1% of men; ΔE 4.3 from the original
Deuteranopia#464D5Fno green cones; the most common form, about 1% of men; ΔE 4.4 from the original
Tritanopia#355455no blue cones; rare, and affects men and women equally; ΔE 10.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.32:1WCAG large text: AAA
Contrast with black, large text2.52:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 11.8Dim grey · ΔE 15.9Slate grey · ΔE 19.7Light slate grey · ΔE 22.7Gray · ΔE 23.3Steel blue · ΔE 28.8
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 11.8, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5F4E3F
Analogous#3F5F5E, #3F405F
Triadic#5F3F50, #505F3F
Split complementary#5F3F40, #5F5E3F
Tetradic#5E3F5F, #5F4E3F, #405F3F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A6B6C4
Lighter +30%#879DB0
Lighter +20%#69849B
Lighter +10%#536A7E
Darker −10%#2B3640
Darker −20%#161C22
Darker −30%#020303
Darker −40%#000000
More saturated +25%#2B5173
Less saturated −25%#4F4F4F

Channel breakdown

R63
G80
B95
Red63 (24.7%)
Green80 (31.4%)
Blue95 (37.3%)
Hue208.13°
Saturation (HSL)20.25%
Lightness30.98%
Dominant channelBlue
Hex per channelR 3F · G 50 · B 5F

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Every value on this page was computed from “3f505f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.