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Colour

#638FBB

  • #638FBB
  • Blue
  • Dark
  • Nearest: Steel blue

#638FBB is a blue with RGB values 99, 143, 187 and HSL 210°, 39%, 56%. It is a dark colour, so black text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#638FBB#638FBB
HEX#638FBB
RGBrgb(99, 143, 187)
RGB (0–1)0.3882, 0.5608, 0.7333
RGB percentages38.8%, 56.1%, 73.3%
HSLhsl(210, 39.3%, 56.1%)
HSV / HSBhsv(210, 47.1%, 73.3%)
CMYK47.1%, 23.5%, 0%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,524,859
CSS custom property--colour: #638FBB;

Brightness & contrast

Relative luminance0.25885WCAG 2.x, 0 is black and 1 is white
Perceived brightness137.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.18:1
Contrast with white3.4:1WCAG normal text: Fail
Contrast with black6.18:1WCAG normal text: AA
Greyscale equivalent#898989
Inverted#9C7044

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7D90BDno red cones; affects about 1% of men; ΔE 7.6 from the original
Deuteranopia#7287BAno green cones; the most common form, about 1% of men; ΔE 8.6 from the original
Tritanopia#3D999Eno blue cones; rare, and affects men and women equally; ΔE 28 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.4:1WCAG large text: AA
Contrast with black, large text6.18:1WCAG large text: AAA

Named colours

Steel blue · ΔE 7.2Light slate grey · ΔE 16.6Slate grey · ΔE 17.8Light skyblue · ΔE 23.2Light steelblue · ΔE 24Sky blue · ΔE 25.2
Nearest named CSS colourSteel blue (#4682B4)ΔE 7.23, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BB8F63
Analogous#63BBBB, #6363BB
Triadic#BB638F, #8FBB63
Split complementary#BB6363, #BBBB63
Tetradic#BB63BB, #BB8F63, #63BB63

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F1F5F9
Lighter +30%#CEDCE9
Lighter +20%#AAC2DA
Lighter +10%#87A9CA
Darker −10%#4776A4
Darker −20%#385C80
Darker −30%#28435D
Darker −40%#192939
More saturated +25%#478FD7
Less saturated −25%#7F8F9F

Channel breakdown

R99
G143
B187
Red99 (38.8%)
Green143 (56.1%)
Blue187 (73.3%)
Hue210°
Saturation (HSL)39.29%
Lightness56.08%
Dominant channelBlue
Hex per channelR 63 · G 8F · B BB

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