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Recognised as Colour

#173A88

  • #173A88
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173A88 is a blue with RGB values 23, 58, 136 and HSL 221°, 71%, 31%. It is a dark colour, so white text on it reaches 10.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173A88#173A88
HEX#173A88
RGBrgb(23, 58, 136)
RGB (0–1)0.0902, 0.2275, 0.5333
RGB percentages9%, 22.7%, 53.3%
HSLhsl(221.4, 71.1%, 31.2%)
HSV / HSBhsv(221.4, 83.1%, 53.3%)
CMYK83.1%, 57.4%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,312
CSS custom property--colour: #173A88;

Brightness & contrast

Relative luminance0.04986WCAG 2.x, 0 is black and 1 is white
Perceived brightness65.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.51:1
Contrast with white10.51:1WCAG normal text: AAA
Contrast with black2:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E8C577

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#00458Bno red cones; affects about 1% of men; ΔE 9.1 from the original
Deuteranopia#003A86no green cones; the most common form, about 1% of men; ΔE 2.5 from the original
Tritanopia#004D5Bno blue cones; rare, and affects men and women equally; ΔE 47 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.51:1WCAG large text: AAA
Contrast with black, large text2:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 10Midnight blue · ΔE 17.3Rebecca purple · ΔE 25.2Slate blue · ΔE 27.8Royal blue · ΔE 29Medium purple · ΔE 33.9
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#886517
Analogous#177388, #2C1788
Triadic#88173A, #3A8817
Split complementary#882C17, #738817
Tetradic#881773, #886517, #17882C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#81A2EA
Lighter +30%#5681E2
Lighter +20%#2A61DB
Lighter +10%#1E4DB4
Darker −10%#10275C
Darker −20%#081531
Darker −30%#010205
Darker −40%#000000
More saturated +25%#03329C
Less saturated −25%#2B4274

Channel breakdown

R23
G58
B136
Red23 (9%)
Green58 (22.7%)
Blue136 (53.3%)
Hue221.42°
Saturation (HSL)71.07%
Lightness31.18%
Dominant channelBlue
Hex per channelR 17 · G 3A · B 88

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Every value on this page was computed from “173a88” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.