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Recognised as Colour

#633D8A

  • #633D8A
  • Violet
  • Dark
  • Nearest: Dark slateblue

#633D8A is a violet with RGB values 99, 61, 138 and HSL 270°, 39%, 39%. It is a dark colour, so white text on it reaches 8.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#633D8A#633D8A
HEX#633D8A
RGBrgb(99, 61, 138)
RGB (0–1)0.3882, 0.2392, 0.5412
RGB percentages38.8%, 23.9%, 54.1%
HSLhsl(269.6, 38.7%, 39%)
HSV / HSBhsv(269.6, 55.8%, 54.1%)
CMYK28.3%, 55.8%, 0%, 45.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,503,818
CSS custom property--colour: #633D8A;

Brightness & contrast

Relative luminance0.07825WCAG 2.x, 0 is black and 1 is white
Perceived brightness85.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.19:1
Contrast with white8.19:1WCAG normal text: AAA
Contrast with black2.57:1WCAG normal text: Fail
Greyscale equivalent#4B4B4B
Inverted#9CC275

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#224E8Dno red cones; affects about 1% of men; ΔE 24.8 from the original
Deuteranopia#2F4F88no green cones; the most common form, about 1% of men; ΔE 25.2 from the original
Tritanopia#5C4B5Dno blue cones; rare, and affects men and women equally; ΔE 36.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text8.19:1WCAG large text: AAA
Contrast with black, large text2.57:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 8.9Rebecca purple · ΔE 14.5Midnight blue · ΔE 21.9Slate blue · ΔE 24.2Medium purple · ΔE 25.5Purple · ΔE 26.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 8.93, clearly different but related
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#648A3D
Analogous#3D3E8A, #893D8A
Triadic#8A633D, #3D8A63
Split complementary#8A8A3D, #3D8A3D
Tetradic#8A3D3E, #648A3D, #3D8A89

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9B5DE
Lighter +30%#B091CF
Lighter +20%#966EBF
Lighter +10%#7C4DAD
Darker −10%#4A2D67
Darker −20%#301E43
Darker −30%#170E20
Darker −40%#000000
More saturated +25%#6324A3
Less saturated −25%#635671

Channel breakdown

R99
G61
B138
Red99 (38.8%)
Green61 (23.9%)
Blue138 (54.1%)
Hue269.61°
Saturation (HSL)38.69%
Lightness39.02%
Dominant channelBlue
Hex per channelR 63 · G 3D · B 8A

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Every value on this page was computed from “633d8a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.