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Recognised as Colour

#171B25

  • #171B25
  • Blue
  • Dark
  • Nearest: Black

#171B25 is a blue with RGB values 23, 27, 37 and HSL 223°, 23%, 12%. It is a dark colour, so white text on it reaches 17.2:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#171B25#171B25
HEX#171B25
RGBrgb(23, 27, 37)
RGB (0–1)0.0902, 0.1059, 0.1451
RGB percentages9%, 10.6%, 14.5%
HSLhsl(222.9, 23.3%, 11.8%)
HSV / HSBhsv(222.9, 37.8%, 14.5%)
CMYK37.8%, 27%, 0%, 85.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,514,277
CSS custom property--colour: #171B25;

Brightness & contrast

Relative luminance0.011WCAG 2.x, 0 is black and 1 is white
Perceived brightness27.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.21:1
Contrast with white17.21:1WCAG normal text: AAA
Contrast with black1.22:1WCAG normal text: Fail
Greyscale equivalent#1B1B1B
Inverted#E8E4DA

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#181C25no red cones; affects about 1% of men; ΔE 0.9 from the original
Deuteranopia#171B25no green cones; the most common form, about 1% of men; ΔE 0 from the original
Tritanopia#131D1Eno blue cones; rare, and affects men and women equally; ΔE 7.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.21:1WCAG large text: AAA
Contrast with black, large text1.22:1WCAG large text: Fail

Named colours

Black · ΔE 12.4Dark slate grey · ΔE 25.3Dim grey · ΔE 35.4Slate grey · ΔE 43.3Gray · ΔE 44.4Light slate grey · ΔE 46.4
Nearest named CSS colourBlack (#000000)ΔE 12.36, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#252117
Analogous#172225, #1A1725
Triadic#25171B, #1B2517
Split complementary#251A17, #222517
Tetradic#251722, #252117, #17251A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6778A1
Lighter +30%#526083
Lighter +20%#3E4964
Lighter +10%#2B3244
Darker −10%#030406
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#10182C
Less saturated −25%#1E1E1E

Channel breakdown

R23
G27
B37
Red23 (9%)
Green27 (10.6%)
Blue37 (14.5%)
Hue222.86°
Saturation (HSL)23.33%
Lightness11.76%
Dominant channelBlue
Hex per channelR 17 · G 1B · B 25

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Every value on this page was computed from “171b25” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.