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Recognised as Colour

#638CE3

  • #638CE3
  • Blue
  • Dark
  • Nearest: Cornflower blue

#638CE3 is a blue with RGB values 99, 140, 227 and HSL 221°, 70%, 64%. 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

#638CE3#638CE3
HEX#638CE3
RGBrgb(99, 140, 227)
RGB (0–1)0.3882, 0.549, 0.8902
RGB percentages38.8%, 54.9%, 89%
HSLhsl(220.8, 69.6%, 63.9%)
HSV / HSBhsv(220.8, 56.4%, 89%)
CMYK56.4%, 38.3%, 0%, 11%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,524,131
CSS custom property--colour: #638CE3;

Brightness & contrast

Relative luminance0.26955WCAG 2.x, 0 is black and 1 is white
Perceived brightness142.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.39:1
Contrast with white3.29:1WCAG normal text: Fail
Contrast with black6.39:1WCAG normal text: AA
Greyscale equivalent#8A8A8A
Inverted#9C731C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6894E6no red cones; affects about 1% of men; ΔE 4.5 from the original
Deuteranopia#5788E1no green cones; the most common form, about 1% of men; ΔE 2.6 from the original
Tritanopia#009FADno blue cones; rare, and affects men and women equally; ΔE 51.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.29:1WCAG large text: AA
Contrast with black, large text6.39:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 3.6Dodgerblue · ΔE 14.9Steel blue · ΔE 23.3Royal blue · ΔE 25.1Medium purple · ΔE 25.9Slate blue · ΔE 29.8
Nearest named CSS colourCornflower blue (#6495ED)ΔE 3.63, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#E3BA63
Analogous#63CCE3, #7A63E3
Triadic#E3638C, #8CE363
Split complementary#E37A63, #CCE363
Tetradic#E363CC, #E3BA63, #63E37A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#E5ECFA
Lighter +20%#B9CCF3
Lighter +10%#8EACEB
Darker −10%#386CDB
Darker −20%#2254BE
Darker −30%#1A4193
Darker −40%#132E67
More saturated +25%#4C84FA
Less saturated −25%#7A94CC

Channel breakdown

R99
G140
B227
Red99 (38.8%)
Green140 (54.9%)
Blue227 (89%)
Hue220.78°
Saturation (HSL)69.57%
Lightness63.92%
Dominant channelBlue
Hex per channelR 63 · G 8C · B E3

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Every value on this page was computed from “638ce3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.