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Recognised as Colour

#638DDE

  • #638DDE
  • Blue
  • Dark
  • Nearest: Cornflower blue

#638DDE is a blue with RGB values 99, 141, 222 and HSL 220°, 65%, 63%. It is a dark colour, so black text on it reaches 6.4:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#638DDE#638DDE
HEX#638DDE
RGBrgb(99, 141, 222)
RGB (0–1)0.3882, 0.5529, 0.8706
RGB percentages38.8%, 55.3%, 87.1%
HSLhsl(219.5, 65.1%, 62.9%)
HSV / HSBhsv(219.5, 55.4%, 87.1%)
CMYK55.4%, 36.5%, 0%, 12.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,524,382
CSS custom property--colour: #638DDE;

Brightness & contrast

Relative luminance0.26976WCAG 2.x, 0 is black and 1 is white
Perceived brightness142.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.4:1
Contrast with white3.28:1WCAG normal text: Fail
Contrast with black6.4:1WCAG normal text: AA
Greyscale equivalent#8A8A8A
Inverted#9C7221

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6C94E1no red cones; affects about 1% of men; ΔE 3.7 from the original
Deuteranopia#5D89DCno green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#119FABno blue cones; rare, and affects men and women equally; ΔE 48.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.28:1WCAG large text: AA
Contrast with black, large text6.4:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 4.7Dodgerblue · ΔE 17.7Steel blue · ΔE 19.9Royal blue · ΔE 28.3Medium purple · ΔE 28.4Deep skyblue · ΔE 30.1
Nearest named CSS colourCornflower blue (#6495ED)ΔE 4.69, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DEB463
Analogous#63CBDE, #7663DE
Triadic#DE638D, #8DDE63
Split complementary#DE7663, #CBDE63
Tetradic#DE63CB, #DEB463, #63DE76

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#E1E9F9
Lighter +20%#B7CBF0
Lighter +10%#8DACE7
Darker −10%#396ED5
Darker −20%#2657B5
Darker −30%#1D438B
Darker −40%#142E61
More saturated +25%#4B86F6
Less saturated −25%#7B94C6

Channel breakdown

R99
G141
B222
Red99 (38.8%)
Green141 (55.3%)
Blue222 (87.1%)
Hue219.51°
Saturation (HSL)65.08%
Lightness62.94%
Dominant channelBlue
Hex per channelR 63 · G 8D · B DE

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Every value on this page was computed from “638dde” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.