Colour

#00337F

#00337F
Blue
Dark
Nearest: Dark slateblue

#00337F is a blue with RGB values 0, 51, 127 and HSL 216°, 100%, 25%. It is a dark colour, so white text on it reaches 11.8:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#00337F#00337F

HEX#00337F

RGBrgb(0, 51, 127)

RGB (0–1)0, 0.2, 0.498

RGB percentages0%, 20%, 49.8%

HSLhsl(215.9, 100%, 24.9%)

HSV / HSBhsv(215.9, 100%, 49.8%)

CMYK100%, 59.8%, 0%, 50.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,183

CSS custom property--colour: #00337F;

Brightness & contrast

Relative luminance0.039WCAG 2.x, 0 is black and 1 is white

Perceived brightness58 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 11.8:1

Contrast with white11.8:1WCAG normal text: AAA

Contrast with black1.78:1WCAG normal text: Fail

Greyscale equivalent#2E2E2E

Inverted#FFCC80

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#003D82no red cones; affects about 1% of men; ΔE 7.5 from the original

Deuteranopia#00327Eno green cones; the most common form, about 1% of men; ΔE 0.5 from the original

Tritanopia#004753no blue cones; rare, and affects men and women equally; ΔE 47.4 from the original

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

Contrast with white, large text11.8:1WCAG large text: AAA

Contrast with black, large text1.78:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 12 Midnight blue · ΔE 15.9 Rebecca purple · ΔE 26.7 Slate blue · ΔE 30.5 Royal blue · ΔE 31.7 Indigo · ΔE 34.4

Nearest named CSS colourDark slateblue (#483D8B)ΔE 12.04, a distinctly different colour

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#7F4C00

Analogous#00727F, #0D007F

Triadic#7F0033, #337F00

Split complementary#7F0D00, #727F00

Tetradic#7F0072, #7F4C00, #007F0D

Tints, shades & saturation

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

Lighter +40%#4C94FF

Lighter +30%#1975FF

Lighter +20%#005CE5

Lighter +10%#0047B2

Darker −10%#001F4C

Darker −20%#000A19

Darker −30%#000000

Darker −40%#000000

More saturated +25%#00337F

Less saturated −25%#10366F

Channel breakdown

G51

B127

Red0 (0%)

Green51 (20%)

Blue127 (49.8%)

Hue215.91°

Saturation (HSL)100%

Lightness24.9%

Dominant channelBlue

Hex per channelR 00 · G 33 · B 7F

Keep nerding

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#00337F

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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