Recognised as Colour

#EF0000

#EF0000
Red
Dark
Nearest: Red

#EF0000 is a red with RGB values 239, 0, 0 and HSL 0°, 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

#EF0000#EF0000

HEX#EF0000

RGBrgb(239, 0, 0)

RGB (0–1)0.9373, 0, 0

RGB percentages93.7%, 0%, 0%

HSLhsl(0, 100%, 46.9%)

HSV / HSBhsv(0, 100%, 93.7%)

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

24-bit integer15,663,104

CSS custom property--colour: #EF0000;

Brightness & contrast

Relative luminance0.18351WCAG 2.x, 0 is black and 1 is white

Perceived brightness130.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.67:1

Contrast with white4.5:1WCAG normal text: Fail

Contrast with black4.67:1WCAG normal text: AA

Greyscale equivalent#333333

Inverted#10FFFF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#655900no red cones; affects about 1% of men; ΔE 83.3 from the original

Deuteranopia#998700no green cones; the most common form, about 1% of men; ΔE 81.6 from the original

Tritanopia#FF000Dno blue cones; rare, and affects men and women equally; ΔE 5.2 from the original

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

Contrast with white, large text4.5:1WCAG large text: AA

Contrast with black, large text4.67:1WCAG large text: AAA

Named colours

Red · ΔE 6 Orange red · ΔE 12.5 Tomato · ΔE 28.3 Crimson · ΔE 31 Firebrick · ΔE 35 Coral · ΔE 39.1

Nearest named CSS colourRed (#FF0000)ΔE 6, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00EFEF

Analogous#EF0077, #EF7700

Triadic#00EF00, #0000EF

Split complementary#00EF77, #0077EF

Tetradic#77EF00, #00EFEF, #7700EF

Tints, shades & saturation

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

Lighter +40%#FFBCBC

Lighter +30%#FF8989

Lighter +20%#FF5656

Lighter +10%#FF2323

Darker −10%#BC0000

Darker −20%#890000

Darker −30%#560000

Darker −40%#230000

More saturated +25%#EF0000

Less saturated −25%#D11E1E

Channel breakdown

R239

Red239 (93.7%)

Green0 (0%)

Blue0 (0%)

Hue0°

Saturation (HSL)100%

Lightness46.86%

Dominant channelRed

Hex per channelR EF · G 00 · B 00

Keep nerding

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

#EF0000

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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