Colour

#21184B

#21184B
Blue
Dark
Nearest: Dark slateblue

#21184B is a blue with RGB values 33, 24, 75 and HSL 251°, 52%, 19%. It is a dark colour, so white text on it reaches 16.2:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#21184B#21184B

HEX#21184B

RGBrgb(33, 24, 75)

RGB (0–1)0.1294, 0.0941, 0.2941

RGB percentages12.9%, 9.4%, 29.4%

HSLhsl(250.6, 51.5%, 19.4%)

HSV / HSBhsv(250.6, 68%, 29.4%)

CMYK56%, 68%, 0%, 70.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer2,168,907

CSS custom property--colour: #21184B;

Brightness & contrast

Relative luminance0.01485WCAG 2.x, 0 is black and 1 is white

Perceived brightness36.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 16.19:1

Contrast with white16.19:1WCAG normal text: AAA

Contrast with black1.3:1WCAG normal text: Fail

Greyscale equivalent#1E1E1E

Inverted#DEE7B4

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#00224Dno red cones; affects about 1% of men; ΔE 12.3 from the original

Deuteranopia#001F4Ano green cones; the most common form, about 1% of men; ΔE 11.3 from the original

Tritanopia#11242Eno blue cones; rare, and affects men and women equally; ΔE 32.3 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text16.19:1WCAG large text: AAA

Contrast with black, large text1.3:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 22.6 Midnight blue · ΔE 22.7 Rebecca purple · ΔE 34.9 Black · ΔE 38.5 Indigo · ΔE 39.9 Purple · ΔE 42.9

Nearest named CSS colourDark slateblue (#483D8B)ΔE 22.58, a distinctly different colour

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#424B18

Analogous#18284B, #3B184B

Triadic#4B2118, #184B21

Split complementary#4B3B18, #284B18

Tetradic#4B1828, #424B18, #184B3B

Tints, shades & saturation

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

Lighter +40%#7562CD

Lighter +30%#543DBF

Lighter +20%#433198

Lighter +10%#322472

Darker −10%#100C24

Darker −20%#000000

Darker −30%#000000

Darker −40%#000000

More saturated +25%#190C57

Less saturated −25%#29243F

Channel breakdown

R33

G24

B75

Red33 (12.9%)

Green24 (9.4%)

Blue75 (29.4%)

Hue250.59°

Saturation (HSL)51.52%

Lightness19.41%

Dominant channelBlue

Hex per channelR 21 · G 18 · B 4B

Keep nerding

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#21184B

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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