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Recognised as Colour

#10171D

  • #10171D
  • Blue
  • Dark
  • Nearest: Black

#10171D is a blue with RGB values 16, 23, 29 and HSL 208°, 29%, 9%. It is a dark colour, so white text on it reaches 18.1:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#10171D#10171D
HEX#10171D
RGBrgb(16, 23, 29)
RGB (0–1)0.0627, 0.0902, 0.1137
RGB percentages6.3%, 9%, 11.4%
HSLhsl(207.7, 28.9%, 8.8%)
HSV / HSBhsv(207.7, 44.8%, 11.4%)
CMYK44.8%, 20.7%, 0%, 88.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,054,493
CSS custom property--colour: #10171D;

Brightness & contrast

Relative luminance0.00812WCAG 2.x, 0 is black and 1 is white
Perceived brightness22 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 18.07:1
Contrast with white18.07:1WCAG normal text: AAA
Contrast with black1.16:1WCAG normal text: Fail
Greyscale equivalent#161616
Inverted#EFE8E2

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#15171Dno red cones; affects about 1% of men; ΔE 2.2 from the original
Deuteranopia#13161Dno green cones; the most common form, about 1% of men; ΔE 1.9 from the original
Tritanopia#0C1819no blue cones; rare, and affects men and women equally; ΔE 4.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text18.07:1WCAG large text: AAA
Contrast with black, large text1.16:1WCAG large text: Fail

Named colours

Black · ΔE 9.1Dark slate grey · ΔE 26.2Dim grey · ΔE 37.5Slate grey · ΔE 45.8Gray · ΔE 46.6Light slate grey · ΔE 48.9
Nearest named CSS colourBlack (#000000)ΔE 9.1, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#1D1610
Analogous#101D1D, #10101D
Triadic#1D1017, #171D10
Split complementary#1D1010, #1D1D10
Tetradic#1D101D, #1D1610, #101D10

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#597FA0
Lighter +30%#466580
Lighter +20%#344B5F
Lighter +10%#22313E
Darker −10%#000000
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A1723
Less saturated −25%#161717

Channel breakdown

R16
G23
B29
Red16 (6.3%)
Green23 (9%)
Blue29 (11.4%)
Hue207.69°
Saturation (HSL)28.89%
Lightness8.82%
Dominant channelBlue
Hex per channelR 10 · G 17 · B 1D

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Every value on this page was computed from “10171d” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.