Colour

#EF0011

#EF0011
Red
Dark
Nearest: Red

#EF0011 is a red with RGB values 239, 0, 17 and HSL 356°, 100%, 47%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#EF0011#EF0011

HEX#EF0011

RGBrgb(239, 0, 17)

RGB (0–1)0.9373, 0, 0.0667

RGB percentages93.7%, 0%, 6.7%

HSLhsl(355.7, 100%, 46.9%)

HSV / HSBhsv(355.7, 100%, 93.7%)

CMYK0%, 100%, 92.9%, 6.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,663,121

CSS custom property--colour: #EF0011;

Brightness & contrast

Relative luminance0.18391WCAG 2.x, 0 is black and 1 is white

Perceived brightness130.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.68:1

Contrast with white4.49:1WCAG normal text: Fail

Contrast with black4.68:1WCAG normal text: AA

Greyscale equivalent#343434

Inverted#10FFEE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#655908no red cones; affects about 1% of men; ΔE 82.7 from the original

Deuteranopia#988700no green cones; the most common form, about 1% of men; ΔE 82.2 from the original

Tritanopia#FF0011no blue cones; rare, and affects men and women equally; ΔE 6.2 from the original

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

Contrast with white, large text4.49:1WCAG large text: AA

Contrast with black, large text4.68:1WCAG large text: AAA

Named colours

Red · ΔE 9.3 Orange red · ΔE 15 Tomato · ΔE 25.7 Crimson · ΔE 26.4 Firebrick · ΔE 31.7 Coral · ΔE 37.4

Nearest named CSS colourRed (#FF0000)ΔE 9.35, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00EFDE

Analogous#EF0089, #EF6700

Triadic#11EF00, #0011EF

Split complementary#00EF66, #0089EF

Tetradic#88EF00, #00EFDE, #6600EF

Tints, shades & saturation

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

Lighter +40%#FFBCC1

Lighter +30%#FF8991

Lighter +20%#FF5662

Lighter +10%#FF2333

Darker −10%#BC000D

Darker −20%#89000A

Darker −30%#560006

Darker −40%#230002

More saturated +25%#EF0011

Less saturated −25%#D11E2B

Channel breakdown

R239

B17

Red239 (93.7%)

Green0 (0%)

Blue17 (6.7%)

Hue355.73°

Saturation (HSL)100%

Lightness46.86%

Dominant channelRed

Hex per channelR EF · G 00 · B 11

Keep nerding

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

#EF0011

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