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Colour

#173B70

  • #173B70
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173B70 is a blue with RGB values 23, 59, 112 and HSL 216°, 66%, 26%. It is a dark colour, so white text on it reaches 11.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173B70#173B70
HEX#173B70
RGBrgb(23, 59, 112)
RGB (0–1)0.0902, 0.2314, 0.4392
RGB percentages9%, 23.1%, 43.9%
HSLhsl(215.7, 65.9%, 26.5%)
HSV / HSBhsv(215.7, 79.5%, 43.9%)
CMYK79.5%, 47.3%, 0%, 56.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,544
CSS custom property--colour: #173B70;

Brightness & contrast

Relative luminance0.0448WCAG 2.x, 0 is black and 1 is white
Perceived brightness60.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.08:1
Contrast with white11.08:1WCAG normal text: AAA
Contrast with black1.9:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#E8C48F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#204072no red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#0D386Fno green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#004850no blue cones; rare, and affects men and women equally; ΔE 34.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.08:1WCAG large text: AAA
Contrast with black, large text1.9:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 20.6Steel blue · ΔE 29.8Midnight blue · ΔE 29.9Dark slate grey · ΔE 36.8Slate grey · ΔE 37.8Rebecca purple · ΔE 38.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 20.63, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#704C17
Analogous#176770, #1F1770
Triadic#70173B, #3B7017
Split complementary#702017, #677017
Tetradic#701768, #704C17, #177020

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#719FE2
Lighter +30%#4782D9
Lighter +20%#2868C5
Lighter +10%#20519A
Darker −10%#0E2546
Darker −20%#060E1B
Darker −30%#000000
Darker −40%#000000
More saturated +25%#063881
Less saturated −25%#283E5F

Channel breakdown

R23
G59
B112
Red23 (9%)
Green59 (23.1%)
Blue112 (43.9%)
Hue215.73°
Saturation (HSL)65.93%
Lightness26.47%
Dominant channelBlue
Hex per channelR 17 · G 3B · B 70

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Every value on this page was computed from “173b70” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.