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Recognised as Colour

#175D87

  • #175D87
  • Blue
  • Dark
  • Nearest: Steel blue

#175D87 is a blue with RGB values 23, 93, 135 and HSL 203°, 71%, 31%. It is a dark colour, so white text on it reaches 7.1:1 contrast (AAA for normal text). The nearest named colour is Steel blue.

Colour values

#175D87#175D87
HEX#175D87
RGBrgb(23, 93, 135)
RGB (0–1)0.0902, 0.3647, 0.5294
RGB percentages9%, 36.5%, 52.9%
HSLhsl(202.5, 70.9%, 31%)
HSV / HSBhsv(202.5, 83%, 52.9%)
CMYK83%, 31.1%, 0%, 47.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,531,271
CSS custom property--colour: #175D87;

Brightness & contrast

Relative luminance0.0976WCAG 2.x, 0 is black and 1 is white
Perceived brightness85.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.11:1
Contrast with white7.11:1WCAG normal text: AAA
Contrast with black2.95:1WCAG normal text: Fail
Greyscale equivalent#515151
Inverted#E8A278

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#495E89no red cones; affects about 1% of men; ΔE 10.5 from the original
Deuteranopia#3A5386no green cones; the most common form, about 1% of men; ΔE 12.3 from the original
Tritanopia#00676Cno blue cones; rare, and affects men and women equally; ΔE 26.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.11:1WCAG large text: AAA
Contrast with black, large text2.95:1WCAG large text: Fail

Named colours

Steel blue · ΔE 15.4Slate grey · ΔE 24.5Light slate grey · ΔE 26.1Dark slate grey · ΔE 27.1Dim grey · ΔE 30.6Teal · ΔE 33.2
Nearest named CSS colourSteel blue (#4682B4)ΔE 15.39, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#874117
Analogous#178779, #172587
Triadic#87175D, #5D8717
Split complementary#871725, #877917
Tetradic#791787, #874117, #258717

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#81C2E9
Lighter +30%#55ADE2
Lighter +20%#2998DB
Lighter +10%#1E7BB3
Darker −10%#103F5B
Darker −20%#082130
Darker −30%#010304
Darker −40%#000000
More saturated +25%#03629B
Less saturated −25%#2B5873

Channel breakdown

R23
G93
B135
Red23 (9%)
Green93 (36.5%)
Blue135 (52.9%)
Hue202.5°
Saturation (HSL)70.89%
Lightness30.98%
Dominant channelBlue
Hex per channelR 17 · G 5D · B 87

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Every value on this page was computed from “175d87” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.