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Recognised as Colour

#172B5A

  • #172B5A
  • Blue
  • Dark
  • Nearest: Dark slateblue

#172B5A is a blue with RGB values 23, 43, 90 and HSL 222°, 59%, 22%. It is a dark colour, so white text on it reaches 13.7:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#172B5A#172B5A
HEX#172B5A
RGBrgb(23, 43, 90)
RGB (0–1)0.0902, 0.1686, 0.3529
RGB percentages9%, 16.9%, 35.3%
HSLhsl(222.1, 59.3%, 22.2%)
HSV / HSBhsv(222.1, 74.4%, 35.3%)
CMYK74.4%, 52.2%, 0%, 64.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,518,426
CSS custom property--colour: #172B5A;

Brightness & contrast

Relative luminance0.02648WCAG 2.x, 0 is black and 1 is white
Perceived brightness46.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.73:1
Contrast with white13.73:1WCAG normal text: AAA
Contrast with black1.53:1WCAG normal text: Fail
Greyscale equivalent#2A2A2A
Inverted#E8D4A5

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#11305Cno red cones; affects about 1% of men; ΔE 4.2 from the original
Deuteranopia#022A59no green cones; the most common form, about 1% of men; ΔE 2.9 from the original
Tritanopia#00363Eno blue cones; rare, and affects men and women equally; ΔE 31.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text13.73:1WCAG large text: AAA
Contrast with black, large text1.53:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 23.1Midnight blue · ΔE 28.9Steel blue · ΔE 36.8Dark slate grey · ΔE 36.9Black · ΔE 37.3Rebecca purple · ΔE 39.4
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#5A4617
Analogous#174D5A, #24175A
Triadic#5A172B, #2B5A17
Split complementary#5A2417, #4D5A17
Tetradic#5A174D, #5A4617, #175A24

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6587D8
Lighter +30%#3D68CD
Lighter +20%#2C52AB
Lighter +10%#213E83
Darker −10%#0D1831
Darker −20%#020409
Darker −30%#000000
Darker −40%#000000
More saturated +25%#092568
Less saturated −25%#25314C

Channel breakdown

R23
G43
B90
Red23 (9%)
Green43 (16.9%)
Blue90 (35.3%)
Hue222.09°
Saturation (HSL)59.29%
Lightness22.16%
Dominant channelBlue
Hex per channelR 17 · G 2B · B 5A

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Every value on this page was computed from “172b5a” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.