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Recognised as Colour

#644B89

  • #644B89
  • Violet
  • Dark
  • Nearest: Dark slateblue

#644B89 is a violet with RGB values 100, 75, 137 and HSL 264°, 29%, 42%. It is a dark colour, so white text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#644B89#644B89
HEX#644B89
RGBrgb(100, 75, 137)
RGB (0–1)0.3922, 0.2941, 0.5373
RGB percentages39.2%, 29.4%, 53.7%
HSLhsl(264.2, 29.2%, 41.6%)
HSV / HSBhsv(264.2, 45.3%, 53.7%)
CMYK27%, 45.3%, 0%, 46.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,572,937
CSS custom property--colour: #644B89;

Brightness & contrast

Relative luminance0.09548WCAG 2.x, 0 is black and 1 is white
Perceived brightness91.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.22:1
Contrast with white7.22:1WCAG normal text: AAA
Contrast with black2.91:1WCAG normal text: Fail
Greyscale equivalent#555555
Inverted#9BB476

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3A578Bno red cones; affects about 1% of men; ΔE 18.6 from the original
Deuteranopia#3F5787no green cones; the most common form, about 1% of men; ΔE 18.7 from the original
Tritanopia#5D5663no blue cones; rare, and affects men and women equally; ΔE 30.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text7.22:1WCAG large text: AAA
Contrast with black, large text2.91:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 13Rebecca purple · ΔE 25.1Medium purple · ΔE 29.2Midnight blue · ΔE 29.2Slate blue · ΔE 30.6Steel blue · ΔE 32.3
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.97, a distinctly different colour
Hue familyviolet
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#70894B
Analogous#4B5189, #834B89
Triadic#89644B, #4B8964
Split complementary#89834B, #51894B
Tetradic#894B51, #70894B, #4B8983

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CDC2DE
Lighter +30%#B2A1CC
Lighter +20%#9780BA
Lighter +10%#7D5FA8
Darker −10%#4C3968
Darker −20%#342747
Darker −30%#1C1526
Darker −40%#040305
More saturated +25%#5F31A3
Less saturated −25%#69666E

Channel breakdown

R100
G75
B137
Red100 (39.2%)
Green75 (29.4%)
Blue137 (53.7%)
Hue264.19°
Saturation (HSL)29.25%
Lightness41.57%
Dominant channelBlue
Hex per channelR 64 · G 4B · B 89

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Every value on this page was computed from “644b89” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.