Recognised as Colour

#666F91

#666F91
Blue
Dark
Nearest: Slate grey

#666F91 is a blue with RGB values 102, 111, 145 and HSL 227°, 17%, 48%. It is a dark colour, so white text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#666F91#666F91

HEX#666F91

RGBrgb(102, 111, 145)

RGB (0–1)0.4, 0.4353, 0.5686

RGB percentages40%, 43.5%, 56.9%

HSLhsl(227.4, 17.4%, 48.4%)

HSV / HSBhsv(227.4, 29.7%, 56.9%)

CMYK29.7%, 23.4%, 0%, 43.1%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer6,713,233

CSS custom property--colour: #666F91;

Brightness & contrast

Relative luminance0.16238WCAG 2.x, 0 is black and 1 is white

Perceived brightness112.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 4.94:1

Contrast with white4.94:1WCAG normal text: AA

Contrast with black4.25:1WCAG normal text: Fail

Greyscale equivalent#707070

Inverted#99906E

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#657293no red cones; affects about 1% of men; ΔE 1.8 from the original

Deuteranopia#626F90no green cones; the most common form, about 1% of men; ΔE 1.6 from the original

Tritanopia#5B757Bno blue cones; rare, and affects men and women equally; ΔE 18.4 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text4.94:1WCAG large text: AAA

Contrast with black, large text4.25:1WCAG large text: AA

Named colours

Slate grey · ΔE 12.7 Light slate grey · ΔE 14.1 Steel blue · ΔE 16.2 Dim grey · ΔE 20.5 Gray · ΔE 21.2 Dark slate grey · ΔE 28

Nearest named CSS colourSlate grey (#708090)ΔE 12.74, a distinctly different colour

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#918866

Analogous#668491, #736691

Triadic#91666F, #6F9166

Split complementary#917366, #849166

Tetradic#916684, #918866, #669173

Tints, shades & saturation

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

Lighter +40%#DCDFE7

Lighter +30%#BEC2D2

Lighter +20%#A0A6BD

Lighter +10%#838AA7

Darker −10%#515873

Darker −20%#3C4155

Darker −30%#272A37

Darker −40%#121319

More saturated +25%#475DB0

Less saturated −25%#7C7C7C

Channel breakdown

R102

G111

B145

Red102 (40%)

Green111 (43.5%)

Blue145 (56.9%)

Hue227.44°

Saturation (HSL)17.41%

Lightness48.43%

Dominant channelBlue

Hex per channelR 66 · G 6F · B 91

Keep nerding

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

#666F91

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

Nerdulate something else