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Colour

#646BDA

  • #646BDA
  • Blue
  • Dark
  • Nearest: Royal blue

#646BDA is a blue with RGB values 100, 107, 218 and HSL 236°, 61%, 62%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#646BDA#646BDA
HEX#646BDA
RGBrgb(100, 107, 218)
RGB (0–1)0.3922, 0.4196, 0.8549
RGB percentages39.2%, 42%, 85.5%
HSLhsl(236.4, 61.5%, 62.4%)
HSV / HSBhsv(236.4, 54.1%, 85.5%)
CMYK54.1%, 50.9%, 0%, 14.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,581,210
CSS custom property--colour: #646BDA;

Brightness & contrast

Relative luminance0.18287WCAG 2.x, 0 is black and 1 is white
Perceived brightness123 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.66:1
Contrast with white4.51:1WCAG normal text: AA
Contrast with black4.66:1WCAG normal text: AA
Greyscale equivalent#727272
Inverted#9B9425

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#317BDEno red cones; affects about 1% of men; ΔE 16.7 from the original
Deuteranopia#1F72D8no green cones; the most common form, about 1% of men; ΔE 14.9 from the original
Tritanopia#2A8498no blue cones; rare, and affects men and women equally; ΔE 62.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.51:1WCAG large text: AAA
Contrast with black, large text4.66:1WCAG large text: AAA

Named colours

Royal blue · ΔE 7.9Slate blue · ΔE 8.8Medium purple · ΔE 12.5Medium slateblue · ΔE 14.8Dodgerblue · ΔE 21.6Cornflower blue · ΔE 24.3
Nearest named CSS colourRoyal blue (#4169E1)ΔE 7.91, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DAD364
Analogous#64A6DA, #9864DA
Triadic#DA646B, #6BDA64
Split complementary#DA9864, #A6DA64
Tetradic#DA64A6, #DAD364, #64DA98

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#E0E1F7
Lighter +20%#B6BAEE
Lighter +10%#8D92E4
Darker −10%#3B44D0
Darker −20%#2A31AE
Darker −30%#202685
Darker −40%#161A5C
More saturated +25%#4C56F2
Less saturated −25%#7C80C2

Channel breakdown

R100
G107
B218
Red100 (39.2%)
Green107 (42%)
Blue218 (85.5%)
Hue236.44°
Saturation (HSL)61.46%
Lightness62.35%
Dominant channelBlue
Hex per channelR 64 · G 6B · B DA

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Every value on this page was computed from “646bda” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.