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Recognised as Colour

#647A91

  • #647A91
  • Blue
  • Dark
  • Nearest: Slate grey

#647A91 is a blue with RGB values 100, 122, 145 and HSL 211°, 18%, 48%. 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

#647A91#647A91
HEX#647A91
RGBrgb(100, 122, 145)
RGB (0–1)0.3922, 0.4784, 0.5686
RGB percentages39.2%, 47.8%, 56.9%
HSLhsl(210.7, 18.4%, 48%)
HSV / HSBhsv(210.7, 31%, 56.9%)
CMYK31%, 15.9%, 0%, 43.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,584,977
CSS custom property--colour: #647A91;

Brightness & contrast

Relative luminance0.18673WCAG 2.x, 0 is black and 1 is white
Perceived brightness118.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.73:1
Contrast with white4.44:1WCAG normal text: Fail
Contrast with black4.73:1WCAG normal text: AA
Greyscale equivalent#777777
Inverted#9B856E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#717A92no red cones; affects about 1% of men; ΔE 4.7 from the original
Deuteranopia#6C7691no green cones; the most common form, about 1% of men; ΔE 5 from the original
Tritanopia#577F81no blue cones; rare, and affects men and women equally; ΔE 14.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.44:1WCAG large text: AA
Contrast with black, large text4.73:1WCAG large text: AAA

Named colours

Slate grey · ΔE 5.2Light slate grey · ΔE 6.9Gray · ΔE 15.6Dim grey · ΔE 16.3Steel blue · ΔE 17.4Cadetblue · ΔE 21.9
Nearest named CSS colourSlate grey (#708090)ΔE 5.16, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#917B64
Analogous#649191, #646491
Triadic#91647A, #7A9164
Split complementary#916464, #919164
Tetradic#916491, #917B64, #649164

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DBE0E6
Lighter +30%#BDC7D1
Lighter +20%#9FADBC
Lighter +10%#8094A8
Darker −10%#4F6173
Darker −20%#3A4755
Darker −30%#262E36
Darker −40%#111418
More saturated +25%#4579B0
Less saturated −25%#7A7A7A

Channel breakdown

R100
G122
B145
Red100 (39.2%)
Green122 (47.8%)
Blue145 (56.9%)
Hue210.67°
Saturation (HSL)18.37%
Lightness48.04%
Dominant channelBlue
Hex per channelR 64 · G 7A · B 91

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Every value on this page was computed from “647a91” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.