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Colour

#664B45

  • #664B45
  • Red
  • Dark
  • Nearest: Dim grey

#664B45 is a red with RGB values 102, 75, 69 and HSL 11°, 19%, 34%. It is a dark colour, so white text on it reaches 7.9:1 contrast (AAA for normal text). The nearest named colour is Dim grey.

Colour values

#664B45#664B45
HEX#664B45
RGBrgb(102, 75, 69)
RGB (0–1)0.4, 0.2941, 0.2706
RGB percentages40%, 29.4%, 27.1%
HSLhsl(10.9, 19.3%, 33.5%)
HSV / HSBhsv(10.9, 32.4%, 40%)
CMYK0%, 26.5%, 32.4%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,703,941
CSS custom property--colour: #664B45;

Brightness & contrast

Relative luminance0.08287WCAG 2.x, 0 is black and 1 is white
Perceived brightness83.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.9:1
Contrast with white7.9:1WCAG normal text: AAA
Contrast with black2.66:1WCAG normal text: Fail
Greyscale equivalent#505050
Inverted#99B4BA

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#514E45no red cones; affects about 1% of men; ΔE 11.4 from the original
Deuteranopia#575345no green cones; the most common form, about 1% of men; ΔE 11.6 from the original
Tritanopia#6C4749no blue cones; rare, and affects men and women equally; ΔE 6.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.9:1WCAG large text: AAA
Contrast with black, large text2.66:1WCAG large text: Fail

Named colours

Dim grey · ΔE 16.5Gray · ΔE 23.2Dark slate grey · ΔE 25.4Slate grey · ΔE 29Rosy brown · ΔE 29.8Light slate grey · ΔE 31.4
Nearest named CSS colourDim grey (#696969)ΔE 16.48, a distinctly different colour
Hue familyred
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#456066
Analogous#66454F, #665C45
Triadic#45664B, #4B4566
Split complementary#45665C, #455066
Tetradic#506645, #456066, #5C4566

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9B3AE
Lighter +30%#B49790
Lighter +20%#9F7A72
Lighter +10%#84615A
Darker −10%#483530
Darker −20%#291E1C
Darker −30%#0B0807
Darker −40%#000000
More saturated +25%#7B3D30
Less saturated −25%#565656

Channel breakdown

R102
G75
B69
Red102 (40%)
Green75 (29.4%)
Blue69 (27.1%)
Hue10.91°
Saturation (HSL)19.3%
Lightness33.53%
Dominant channelRed
Hex per channelR 66 · G 4B · B 45

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Every value on this page was computed from “664b45” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.