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Recognised as Colour

#17478D

  • #17478D
  • Blue
  • Dark
  • Nearest: Dark slateblue

#17478D is a blue with RGB values 23, 71, 141 and HSL 216°, 72%, 32%. It is a dark colour, so white text on it reaches 9:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#17478D#17478D
HEX#17478D
RGBrgb(23, 71, 141)
RGB (0–1)0.0902, 0.2784, 0.5529
RGB percentages9%, 27.8%, 55.3%
HSLhsl(215.6, 72%, 32.2%)
HSV / HSBhsv(215.6, 83.7%, 55.3%)
CMYK83.7%, 49.6%, 0%, 44.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,525,645
CSS custom property--colour: #17478D;

Brightness & contrast

Relative luminance0.06612WCAG 2.x, 0 is black and 1 is white
Perceived brightness73.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.04:1
Contrast with white9.04:1WCAG normal text: AAA
Contrast with black2.32:1WCAG normal text: Fail
Greyscale equivalent#424242
Inverted#E8B872

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1E4E90no red cones; affects about 1% of men; ΔE 4.4 from the original
Deuteranopia#00448Cno green cones; the most common form, about 1% of men; ΔE 2.2 from the original
Tritanopia#005863no blue cones; rare, and affects men and women equally; ΔE 42.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.04:1WCAG large text: AAA
Contrast with black, large text2.32:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 14.7Midnight blue · ΔE 26Steel blue · ΔE 28.8Royal blue · ΔE 31.4Cornflower blue · ΔE 31.7Rebecca purple · ΔE 31.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 14.66, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#8D5D17
Analogous#17828D, #22178D
Triadic#8D1747, #478D17
Split complementary#8D2217, #828D17
Tetradic#8D1782, #8D5D17, #178D22

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#85AEEB
Lighter +30%#5992E4
Lighter +20%#2D75DD
Lighter +10%#1E5DB9
Darker −10%#103161
Darker −20%#091B35
Darker −30%#020509
Darker −40%#000000
More saturated +25%#0343A2
Less saturated −25%#2B4B79

Channel breakdown

R23
G71
B141
Red23 (9%)
Green71 (27.8%)
Blue141 (55.3%)
Hue215.59°
Saturation (HSL)71.95%
Lightness32.16%
Dominant channelBlue
Hex per channelR 17 · G 47 · B 8D

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Every value on this page was computed from “17478d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.