Recognised as Colour

#172B8B

#172B8B
Blue
Dark
Nearest: Midnight blue

#172B8B is a blue with RGB values 23, 43, 139 and HSL 230°, 72%, 32%. It is a dark colour, so white text on it reaches 12:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#172B8B#172B8B

HEX#172B8B

RGBrgb(23, 43, 139)

RGB (0–1)0.0902, 0.1686, 0.5451

RGB percentages9%, 16.9%, 54.5%

HSLhsl(229.7, 71.6%, 31.8%)

HSV / HSBhsv(229.7, 83.5%, 54.5%)

CMYK83.5%, 69.1%, 0%, 45.5%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer1,518,475

CSS custom property--colour: #172B8B;

Brightness & contrast

Relative luminance0.03774WCAG 2.x, 0 is black and 1 is white

Perceived brightness58.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 11.97:1

Contrast with white11.97:1WCAG normal text: AAA

Contrast with black1.75:1WCAG normal text: Fail

Greyscale equivalent#2E2E2E

Inverted#E8D474

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#003C8Eno red cones; affects about 1% of men; ΔE 13.8 from the original

Deuteranopia#003189no green cones; the most common form, about 1% of men; ΔE 6.8 from the original

Tritanopia#004557no blue cones; rare, and affects men and women equally; ΔE 57.3 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text11.97:1WCAG large text: AAA

Contrast with black, large text1.75:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 9.1 Dark slateblue · ΔE 15.8 Rebecca purple · ΔE 18.2 Indigo · ΔE 21.9 Navy · ΔE 22.3 Slate blue · ΔE 23.4

Nearest named CSS colourMidnight blue (#191970)ΔE 9.13, clearly different but related

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#8B7717

Analogous#17658B, #3D178B

Triadic#8B172B, #2B8B17

Split complementary#8B3D17, #658B17

Tetradic#8B1765, #8B7717, #178B3D

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#8395EB

Lighter +30%#5870E3

Lighter +20%#2C4ADC

Lighter +10%#1E39B7

Darker −10%#101D5F

Darker −20%#091033

Darker −30%#010208

Darker −40%#000000

More saturated +25%#031E9F

Less saturated −25%#2B3877

Channel breakdown

R23

G43

B139

Red23 (9%)

Green43 (16.9%)

Blue139 (54.5%)

Hue229.66°

Saturation (HSL)71.6%

Lightness31.76%

Dominant channelBlue

Hex per channelR 17 · G 2B · B 8B

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#172B8B

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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