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Recognised as Colour

#663F4F

  • #663F4F
  • Red
  • Dark
  • Nearest: Dim grey

#663F4F is a red with RGB values 102, 63, 79 and HSL 335°, 24%, 32%. It is a dark colour, so white text on it reaches 8.8:1 contrast (AAA for normal text). The nearest named colour is Dim grey.

Colour values

#663F4F#663F4F
HEX#663F4F
RGBrgb(102, 63, 79)
RGB (0–1)0.4, 0.2471, 0.3098
RGB percentages40%, 24.7%, 31%
HSLhsl(335.4, 23.6%, 32.4%)
HSV / HSBhsv(335.4, 38.2%, 40%)
CMYK0%, 38.2%, 22.5%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,700,879
CSS custom property--colour: #663F4F;

Brightness & contrast

Relative luminance0.06944WCAG 2.x, 0 is black and 1 is white
Perceived brightness78.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.79:1
Contrast with white8.79:1WCAG normal text: AAA
Contrast with black2.39:1WCAG normal text: Fail
Greyscale equivalent#484848
Inverted#99C0B0

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#434650no red cones; affects about 1% of men; ΔE 18.9 from the original
Deuteranopia#4D4D4Eno green cones; the most common form, about 1% of men; ΔE 19.5 from the original
Tritanopia#6C3D45no blue cones; rare, and affects men and women equally; ΔE 6.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.79:1WCAG large text: AAA
Contrast with black, large text2.39:1WCAG large text: Fail

Named colours

Dim grey · ΔE 23.5Gray · ΔE 29.5Dark slate grey · ΔE 31.3Slate grey · ΔE 31.3Rosy brown · ΔE 33.3Light slate grey · ΔE 33.7
Nearest named CSS colourDim grey (#696969)ΔE 23.46, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#3F6656
Analogous#663F62, #66423F
Triadic#4F663F, #3F4F66
Split complementary#3F6642, #3F6266
Tetradic#63663F, #3F6656, #423F66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9A8B6
Lighter +30%#B6889B
Lighter +20%#A26980
Lighter +10%#865267
Darker −10%#462C37
Darker −20%#27181E
Darker −30%#070506
Darker −40%#000000
More saturated +25%#7B2A4B
Less saturated −25%#525252

Channel breakdown

R102
G63
B79
Red102 (40%)
Green63 (24.7%)
Blue79 (31%)
Hue335.38°
Saturation (HSL)23.64%
Lightness32.35%
Dominant channelRed
Hex per channelR 66 · G 3F · B 4F

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Every value on this page was computed from “663f4f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.