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Recognised as Colour

#17304B

  • #17304B
  • Blue
  • Dark
  • Nearest: Dark slate grey

#17304B is a blue with RGB values 23, 48, 75 and HSL 211°, 53%, 19%. It is a dark colour, so white text on it reaches 13.5:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#17304B#17304B
HEX#17304B
RGBrgb(23, 48, 75)
RGB (0–1)0.0902, 0.1882, 0.2941
RGB percentages9%, 18.8%, 29.4%
HSLhsl(211.2, 53.1%, 19.2%)
HSV / HSBhsv(211.2, 69.3%, 29.4%)
CMYK69.3%, 36%, 0%, 70.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,519,691
CSS custom property--colour: #17304B;

Brightness & contrast

Relative luminance0.02804WCAG 2.x, 0 is black and 1 is white
Perceived brightness46.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.45:1
Contrast with white13.45:1WCAG normal text: AAA
Contrast with black1.56:1WCAG normal text: Fail
Greyscale equivalent#2D2D2D
Inverted#E8CFB4

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#24314Cno red cones; affects about 1% of men; ΔE 3.5 from the original
Deuteranopia#1D2C4Ano green cones; the most common form, about 1% of men; ΔE 4.2 from the original
Tritanopia#00363Ano blue cones; rare, and affects men and women equally; ΔE 19.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text13.45:1WCAG large text: AAA
Contrast with black, large text1.56:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 23.2Black · ΔE 27.4Dim grey · ΔE 31.9Slate grey · ΔE 34.9Steel blue · ΔE 35.8Dark slateblue · ΔE 36.1
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 23.23, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#4B3217
Analogous#174A4B, #18174B
Triadic#4B1730, #304B17
Split complementary#4B1817, #4A4B17
Tetradic#4B174A, #4B3217, #174B18

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#6095CE
Lighter +30%#3B7BC0
Lighter +20%#2F6299
Lighter +10%#234972
Darker −10%#0B1724
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0B3057
Less saturated −25%#23303F

Channel breakdown

R23
G48
B75
Red23 (9%)
Green48 (18.8%)
Blue75 (29.4%)
Hue211.15°
Saturation (HSL)53.06%
Lightness19.22%
Dominant channelBlue
Hex per channelR 17 · G 30 · B 4B

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Every value on this page was computed from “17304b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.