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Colour

#647AAD

  • #647AAD
  • Blue
  • Dark
  • Nearest: Steel blue

#647AAD is a blue with RGB values 100, 122, 173 and HSL 222°, 31%, 54%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#647AAD#647AAD
HEX#647AAD
RGBrgb(100, 122, 173)
RGB (0–1)0.3922, 0.4784, 0.6784
RGB percentages39.2%, 47.8%, 67.8%
HSLhsl(221.9, 30.8%, 53.5%)
HSV / HSBhsv(221.9, 42.2%, 67.8%)
CMYK42.2%, 29.5%, 0%, 32.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,585,005
CSS custom property--colour: #647AAD;

Brightness & contrast

Relative luminance0.19646WCAG 2.x, 0 is black and 1 is white
Perceived brightness123 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.93:1
Contrast with white4.26:1WCAG normal text: Fail
Contrast with black4.93:1WCAG normal text: AA
Greyscale equivalent#797979
Inverted#9B8552

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#687EAFno red cones; affects about 1% of men; ΔE 2 from the original
Deuteranopia#6178ACno green cones; the most common form, about 1% of men; ΔE 1.1 from the original
Tritanopia#4B858Cno blue cones; rare, and affects men and women equally; ΔE 30.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.26:1WCAG large text: AA
Contrast with black, large text4.93:1WCAG large text: AAA

Named colours

Steel blue · ΔE 10Light slate grey · ΔE 20.6Slate grey · ΔE 20.6Cornflower blue · ΔE 22.6Gray · ΔE 30.2Dim grey · ΔE 31
Nearest named CSS colourSteel blue (#4682B4)ΔE 9.98, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AD9764
Analogous#649EAD, #7364AD
Triadic#AD647A, #7AAD64
Split complementary#AD7264, #9EAD64
Tetradic#AD649E, #AD9764, #64AD72

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E9ECF4
Lighter +30%#C8D0E2
Lighter +20%#A7B3D0
Lighter +10%#8597BF
Darker −10%#4D6191
Darker −20%#3B4B70
Darker −30%#2A354E
Darker −40%#181E2D
More saturated +25%#466ECB
Less saturated −25%#82868F

Channel breakdown

R100
G122
B173
Red100 (39.2%)
Green122 (47.8%)
Blue173 (67.8%)
Hue221.92°
Saturation (HSL)30.8%
Lightness53.53%
Dominant channelBlue
Hex per channelR 64 · G 7A · B AD

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