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Recognised as Colour

#688DB4

  • #688DB4
  • Blue
  • Dark
  • Nearest: Steel blue

#688DB4 is a blue with RGB values 104, 141, 180 and HSL 211°, 34%, 56%. It is a dark colour, so black text on it reaches 6.1:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#688DB4#688DB4
HEX#688DB4
RGBrgb(104, 141, 180)
RGB (0–1)0.4078, 0.5529, 0.7059
RGB percentages40.8%, 55.3%, 70.6%
HSLhsl(210.8, 33.6%, 55.7%)
HSV / HSBhsv(210.8, 42.2%, 70.6%)
CMYK42.2%, 21.7%, 0%, 29.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,852,020
CSS custom property--colour: #688DB4;

Brightness & contrast

Relative luminance0.25288WCAG 2.x, 0 is black and 1 is white
Perceived brightness136.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.06:1
Contrast with white3.47:1WCAG normal text: Fail
Contrast with black6.06:1WCAG normal text: AA
Greyscale equivalent#888888
Inverted#97724B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7E8EB6no red cones; affects about 1% of men; ΔE 6.7 from the original
Deuteranopia#7486B3no green cones; the most common form, about 1% of men; ΔE 7.3 from the original
Tritanopia#4C969Ano blue cones; rare, and affects men and women equally; ΔE 24.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.47:1WCAG large text: AA
Contrast with black, large text6.06:1WCAG large text: AAA

Named colours

Steel blue · ΔE 9.3Light slate grey · ΔE 13.5Slate grey · ΔE 14.6Light steelblue · ΔE 23.1Light skyblue · ΔE 24.2Cadetblue · ΔE 24.5
Nearest named CSS colourSteel blue (#4682B4)ΔE 9.27, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B48F68
Analogous#68B3B4, #6968B4
Triadic#B4688D, #8DB468
Split complementary#B46968, #B3B468
Tetradic#B468B3, #B48F68, #68B469

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F0F4F8
Lighter +30%#CEDAE7
Lighter +20%#ACC0D6
Lighter +10%#8AA7C5
Darker −10%#4D739C
Darker −20%#3C5A7A
Darker −30%#2B4158
Darker −40%#1B2835
More saturated +25%#4C8CD0
Less saturated −25%#848E98

Channel breakdown

R104
G141
B180
Red104 (40.8%)
Green141 (55.3%)
Blue180 (70.6%)
Hue210.79°
Saturation (HSL)33.63%
Lightness55.69%
Dominant channelBlue
Hex per channelR 68 · G 8D · B B4

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Every value on this page was computed from “688db4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.