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Recognised as Colour

#175CA4

  • #175CA4
  • Blue
  • Dark
  • Nearest: Dark slateblue

#175CA4 is a blue with RGB values 23, 92, 164 and HSL 211°, 75%, 37%. It is a dark colour, so white text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Dark slateblue.

Colour values

#175CA4#175CA4
HEX#175CA4
RGBrgb(23, 92, 164)
RGB (0–1)0.0902, 0.3608, 0.6431
RGB percentages9%, 36.1%, 64.3%
HSLhsl(210.6, 75.4%, 36.7%)
HSV / HSBhsv(210.6, 86%, 64.3%)
CMYK86%, 43.9%, 0%, 35.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,531,044
CSS custom property--colour: #175CA4;

Brightness & contrast

Relative luminance0.10517WCAG 2.x, 0 is black and 1 is white
Perceived brightness90.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.77:1
Contrast with white6.77:1WCAG normal text: AA
Contrast with black3.1:1WCAG normal text: Fail
Greyscale equivalent#535353
Inverted#E8A35B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#3762A7no red cones; affects about 1% of men; ΔE 4.5 from the original
Deuteranopia#1A56A3no green cones; the most common form, about 1% of men; ΔE 4.8 from the original
Tritanopia#006D78no blue cones; rare, and affects men and women equally; ΔE 42.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.77:1WCAG large text: AAA
Contrast with black, large text3.1:1WCAG large text: AA

Named colours

Dark slateblue · ΔE 21Steel blue · ΔE 21.5Cornflower blue · ΔE 23.8Dodgerblue · ΔE 28.1Royal blue · ΔE 29.8Slate blue · ΔE 32.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 21.01, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A45F17
Analogous#17A2A4, #1917A4
Triadic#A4175C, #5CA417
Split complementary#A41917, #A2A417
Tetradic#A417A2, #A45F17, #17A419

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#97C3F0
Lighter +30%#6AA9EA
Lighter +20%#3D8FE4
Lighter +10%#1D75D1
Darker −10%#114377
Darker −20%#0A2A4B
Darker −30%#04111E
Darker −40%#000000
More saturated +25%#005CBB
Less saturated −25%#2E5C8D

Channel breakdown

R23
G92
B164
Red23 (9%)
Green92 (36.1%)
Blue164 (64.3%)
Hue210.64°
Saturation (HSL)75.4%
Lightness36.67%
Dominant channelBlue
Hex per channelR 17 · G 5C · B A4

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Every value on this page was computed from “175ca4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.