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Recognised as Colour

#17428C

  • #17428C
  • Blue
  • Dark
  • Nearest: Dark slateblue

#17428C is a blue with RGB values 23, 66, 140 and HSL 218°, 72%, 32%. It is a dark colour, so white text on it reaches 9.6:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#17428C#17428C
HEX#17428C
RGBrgb(23, 66, 140)
RGB (0–1)0.0902, 0.2588, 0.549
RGB percentages9%, 25.9%, 54.9%
HSLhsl(217.9, 71.8%, 32%)
HSV / HSBhsv(217.9, 83.6%, 54.9%)
CMYK83.6%, 52.9%, 0%, 45.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,524,364
CSS custom property--colour: #17428C;

Brightness & contrast

Relative luminance0.05972WCAG 2.x, 0 is black and 1 is white
Perceived brightness70.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.57:1
Contrast with white9.57:1WCAG normal text: AAA
Contrast with black2.19:1WCAG normal text: Fail
Greyscale equivalent#3E3E3E
Inverted#E8BD73

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0F4B8Fno red cones; affects about 1% of men; ΔE 6.8 from the original
Deuteranopia#00408Bno green cones; the most common form, about 1% of men; ΔE 1.8 from the original
Tritanopia#005460no blue cones; rare, and affects men and women equally; ΔE 45.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.57:1WCAG large text: AAA
Contrast with black, large text2.19:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12.1Midnight blue · ΔE 22.3Rebecca purple · ΔE 28.7Slate blue · ΔE 29.6Royal blue · ΔE 29.7Steel blue · ΔE 32.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.08, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8C6117
Analogous#177C8C, #27178C
Triadic#8C1742, #428C17
Split complementary#8C2717, #7C8C17
Tetradic#8C177C, #8C6117, #178C27

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#84AAEB
Lighter +30%#588CE4
Lighter +20%#2D6DDC
Lighter +10%#1E57B8
Darker −10%#102D60
Darker −20%#091934
Darker −30%#010409
Darker −40%#000000
More saturated +25%#033DA0
Less saturated −25%#2B4778

Channel breakdown

R23
G66
B140
Red23 (9%)
Green66 (25.9%)
Blue140 (54.9%)
Hue217.95°
Saturation (HSL)71.78%
Lightness31.96%
Dominant channelBlue
Hex per channelR 17 · G 42 · B 8C

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Every value on this page was computed from “17428c” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.