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Recognised as Colour

#637B7F

  • #637B7F
  • Cyan
  • Dark
  • Nearest: Slate grey

#637B7F is a cyan with RGB values 99, 123, 127 and HSL 189°, 12%, 44%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#637B7F#637B7F
HEX#637B7F
RGBrgb(99, 123, 127)
RGB (0–1)0.3882, 0.4824, 0.498
RGB percentages38.8%, 48.2%, 49.8%
HSLhsl(188.6, 12.4%, 44.3%)
HSV / HSBhsv(188.6, 22%, 49.8%)
CMYK22%, 3.1%, 0%, 50.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,519,679
CSS custom property--colour: #637B7F;

Brightness & contrast

Relative luminance0.18351WCAG 2.x, 0 is black and 1 is white
Perceived brightness116.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.67:1
Contrast with white4.5:1WCAG normal text: Fail
Contrast with black4.67:1WCAG normal text: AA
Greyscale equivalent#767676
Inverted#9C8480

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#77797Fno red cones; affects about 1% of men; ΔE 8.4 from the original
Deuteranopia#72757Fno green cones; the most common form, about 1% of men; ΔE 8.8 from the original
Tritanopia#5B7D7Cno blue cones; rare, and affects men and women equally; ΔE 4.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.5:1WCAG large text: AA
Contrast with black, large text4.67:1WCAG large text: AAA

Named colours

Slate grey · ΔE 8.4Gray · ΔE 9.9Light slate grey · ΔE 10.1Dim grey · ΔE 10.7Cadetblue · ΔE 16.6Dark slate grey · ΔE 19.1
Nearest named CSS colourSlate grey (#708090)ΔE 8.36, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7F6763
Analogous#637F75, #636D7F
Triadic#7F637B, #7B7F63
Split complementary#7F636D, #7F7563
Tetradic#75637F, #7F6763, #6D7F63

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D2DBDC
Lighter +30%#B5C3C6
Lighter +20%#99ACAF
Lighter +10%#7C9599
Darker −10%#4D5F62
Darker −20%#364346
Darker −30%#202829
Darker −40%#0A0C0C
More saturated +25%#478F9B
Less saturated −25%#717171

Channel breakdown

R99
G123
B127
Red99 (38.8%)
Green123 (48.2%)
Blue127 (49.8%)
Hue188.57°
Saturation (HSL)12.39%
Lightness44.31%
Dominant channelBlue
Hex per channelR 63 · G 7B · B 7F

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Every value on this page was computed from “637b7f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.