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Colour

#173A7F

  • #173A7F
  • Blue
  • Dark
  • Nearest: Dark slateblue

#173A7F is a blue with RGB values 23, 58, 127 and HSL 220°, 69%, 29%. It is a dark colour, so white text on it reaches 10.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#173A7F#173A7F
HEX#173A7F
RGBrgb(23, 58, 127)
RGB (0–1)0.0902, 0.2275, 0.498
RGB percentages9%, 22.7%, 49.8%
HSLhsl(219.8, 69.3%, 29.4%)
HSV / HSBhsv(219.8, 81.9%, 49.8%)
CMYK81.9%, 54.3%, 0%, 50.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,522,303
CSS custom property--colour: #173A7F;

Brightness & contrast

Relative luminance0.04741WCAG 2.x, 0 is black and 1 is white
Perceived brightness63 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.78:1
Contrast with white10.78:1WCAG normal text: AAA
Contrast with black1.95:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E8C580

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#084381no red cones; affects about 1% of men; ΔE 7.7 from the original
Deuteranopia#00397Eno green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#004B56no blue cones; rare, and affects men and women equally; ΔE 43.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.78:1WCAG large text: AAA
Contrast with black, large text1.95:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12.3Midnight blue · ΔE 21Rebecca purple · ΔE 29.4Slate blue · ΔE 32.6Royal blue · ΔE 33.5Steel blue · ΔE 34.1
Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.34, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#7F5C17
Analogous#176E7F, #28177F
Triadic#7F173A, #3A7F17
Split complementary#7F2817, #6E7F17
Tetradic#7F176E, #7F5C17, #177F28

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#7B9FE7
Lighter +30%#5080DF
Lighter +20%#2761D5
Lighter +10%#1F4EAA
Darker −10%#0F2654
Darker −20%#071329
Darker −30%#000000
Darker −40%#000000
More saturated +25%#043492
Less saturated −25%#2A406C

Channel breakdown

R23
G58
B127
Red23 (9%)
Green58 (22.7%)
Blue127 (49.8%)
Hue219.81°
Saturation (HSL)69.33%
Lightness29.41%
Dominant channelBlue
Hex per channelR 17 · G 3A · B 7F

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Every value on this page was computed from “173a7f” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.