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Recognised as Colour

#647C8B

  • #647C8B
  • Blue
  • Dark
  • Nearest: Slate grey

#647C8B is a blue with RGB values 100, 124, 139 and HSL 203°, 16%, 47%. It is a dark colour, so black text on it reaches 4.8:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#647C8B#647C8B
HEX#647C8B
RGBrgb(100, 124, 139)
RGB (0–1)0.3922, 0.4863, 0.5451
RGB percentages39.2%, 48.6%, 54.5%
HSLhsl(203.1, 16.3%, 46.9%)
HSV / HSBhsv(203.1, 28.1%, 54.5%)
CMYK28.1%, 10.8%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,585,483
CSS custom property--colour: #647C8B;

Brightness & contrast

Relative luminance0.18989WCAG 2.x, 0 is black and 1 is white
Perceived brightness119.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.8:1
Contrast with white4.38:1WCAG normal text: Fail
Contrast with black4.8:1WCAG normal text: AA
Greyscale equivalent#787878
Inverted#9B8374

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#757B8Cno red cones; affects about 1% of men; ΔE 6.7 from the original
Deuteranopia#70778Bno green cones; the most common form, about 1% of men; ΔE 7 from the original
Tritanopia#588081no blue cones; rare, and affects men and women equally; ΔE 10.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.38:1WCAG large text: AA
Contrast with black, large text4.8:1WCAG large text: AAA

Named colours

Slate grey · ΔE 3.6Light slate grey · ΔE 5.9Gray · ΔE 12.4Dim grey · ΔE 13.6Cadetblue · ΔE 18.4Steel blue · ΔE 21.3
Nearest named CSS colourSlate grey (#708090)ΔE 3.61, a close match
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8B7364
Analogous#648B87, #64688B
Triadic#8B647C, #7C8B64
Split complementary#8B6468, #8B8764
Tetradic#87648B, #8B7364, #688B64

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D8DFE3
Lighter +30%#BAC6CE
Lighter +20%#9DAEB8
Lighter +10%#7F95A3
Darker −10%#4F626D
Darker −20%#394750
Darker −30%#242D32
Darker −40%#0F1214
More saturated +25%#4683A9
Less saturated −25%#777777

Channel breakdown

R100
G124
B139
Red100 (39.2%)
Green124 (48.6%)
Blue139 (54.5%)
Hue203.08°
Saturation (HSL)16.32%
Lightness46.86%
Dominant channelBlue
Hex per channelR 64 · G 7C · B 8B

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Every value on this page was computed from “647c8b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.