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Recognised as Colour

#172C5B

  • #172C5B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#172C5B is a blue with RGB values 23, 44, 91 and HSL 221°, 60%, 22%. It is a dark colour, so white text on it reaches 13.6:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#172C5B#172C5B
HEX#172C5B
RGBrgb(23, 44, 91)
RGB (0–1)0.0902, 0.1725, 0.3569
RGB percentages9%, 17.3%, 35.7%
HSLhsl(221.5, 59.6%, 22.4%)
HSV / HSBhsv(221.5, 74.7%, 35.7%)
CMYK74.7%, 51.6%, 0%, 64.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,518,683
CSS custom property--colour: #172C5B;

Brightness & contrast

Relative luminance0.02739WCAG 2.x, 0 is black and 1 is white
Perceived brightness47.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.57:1
Contrast with white13.57:1WCAG normal text: AAA
Contrast with black1.55:1WCAG normal text: Fail
Greyscale equivalent#2B2B2B
Inverted#E8D3A4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#13315Dno red cones; affects about 1% of men; ΔE 4 from the original
Deuteranopia#032B5Ano green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#00373Fno blue cones; rare, and affects men and women equally; ΔE 31.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text13.57:1WCAG large text: AAA
Contrast with black, large text1.55:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 23.1Midnight blue · ΔE 29.1Steel blue · ΔE 36.3Dark slate grey · ΔE 36.6Black · ΔE 37.4Rebecca purple · ΔE 39.5
Nearest named CSS colourDark slateblue (#483D8B)ΔE 23.14, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5B4617
Analogous#174E5B, #24175B
Triadic#5B172C, #2C5B17
Split complementary#5B2417, #4E5B17
Tetradic#5B174E, #5B4617, #175B24

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6689D8
Lighter +30%#3D6ACE
Lighter +20%#2C53AC
Lighter +10%#214084
Darker −10%#0D1832
Darker −20%#02050A
Darker −30%#000000
Darker −40%#000000
More saturated +25%#092769
Less saturated −25%#25314D

Channel breakdown

R23
G44
B91
Red23 (9%)
Green44 (17.3%)
Blue91 (35.7%)
Hue221.47°
Saturation (HSL)59.65%
Lightness22.35%
Dominant channelBlue
Hex per channelR 17 · G 2C · B 5B

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Every value on this page was computed from “172c5b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.